Edugross

Plant Kingdom Questions

Plant Kingdom Questions
  1. . Introduction
  2. . Life of Plants 
  3. . Survival of Pants
  4. . Parts of a Plant

. Roots and Stem

INTRODUCTION

1.What are plants?

Plants are living things, which manufacture their own food in the presence of light. water air and chlorophyll. Almost 3,50.000 types of plants are known, which grow almost in all possible environment.

Plant Kingdom Questions

2.What do you know about the plant kingdom?

Plants were the first living things to appear on the Earth. long before animal life existed. It started from single celled plants such as algae. The plants survive almost all environment starting from land, water to even surface of wee rocks and dry deserts. They too require air, light and water to survive. The main difference between them and animals is that, they can make their own food whereas animals cannot.

3.How are plants classified?

Sometimes plants are classified according to their size and complexity But mostly they are classified based on the type of reproduction. According to this, they are grouped into spore bearing plants and seed bearing plants. Algae, Mosses, Liverworts and Ferns are spore bearing plants, while flowingplants and conifers are seed bearing plants.

LIFE OF PLANTS

1.Do plants really live?

Plants are living things like human beings. Firstly, because, they can make their own food with the help of light, air and water. Secondly, they produce seeds which can again grow up into new plants.

2.Do plants breathe?

Yes, plants do breathe. The only difference between animals and
plants is that animals inhale oxygen and exhale carbon dioxide, whereas, plants exhale oxygen during the day, and inhale oxygen and exhale carbon dioxide during the night.

3.How long do plants live?

Plants are classified into annuals, biennials and perennials, according to their life span. Annuals are those plants which live for one year. These plants grow, flower and disperse their seeds, and die in a single season. Biennials live for two years. Perennials are those plants which live for more than two years.

SURVIVAL OF PLANTS

1.Do plants make their own food?

Plants grow and produce flowers and seeds which further develop into new plants. They also manufacture their own food. Plants grow upward to receive sunlight, which is necessary for making Sugar produced during photosynthesis is supplied to different parts of the plants Oxygen is released out to try Water is supplied part of the plant Minigol sotond water creabsorbu by the tools food. Green pigment called chlorophyll, present in the leaves absorb sunlight The leaves take in sunlight and carbon dioxide from the air. The roots draw up water from the soil. Cells inside the leaves use the energy of sunlight to change water, carbon dioxide and chlorophyll into glucose (type of sugar), which is the food for the plant. This process is called photosynthesis. The by- products of photosynthesis, i.e., water and oxygen, are released through small openings, called stomata in the leaves.

Plant Kingdom Questions

PARTS OF A PLANT

1.What are the differentparts of a plant?

Roots, stems, leaves and flowers form the different parts of the Flower plant The stem of the plant provides Fruit support to the flowers and leaves. It transports water, minerals and food, to and from the plant’s leaves Stom and roots. Roots The leaves make the sugar necessary for the plants to grow. The sugar is made by the use of sun’s energy, water and carbon dioxide. The roots are the anchor of the plant. They grow downward and hold the plant in place. They absorb the water and minerals from below the ground, required by the plants to grow. The flowers are the reproductive organs of the plant. Some flowers are small and hidden, whereas, others are quite prominent and colourful.

Plant Kingdom Questions

ROOTS AND STEM

1.Why do roots grow So long?

Roots grow long in order to fix the plant firmly in the ground, so that it does not shake or fall down easily. The roots are spread far and wide, so that, por the arted to mathe they can suck water and minerals from all around. The water and minerals are then transported through the stems to the leaves.

2.What are root hairs?

Root hairs are tiny hairs located at the end of the roots, which
deep into the spaces between go lumps of soil.

3.Why are stems straight?

Plants need sunlight to make their food. In order to get the maximum sunlight, the stems grow upwards, tall and straight.

  1. WHAT DO YOU KNOW
  2. Wun vue
  3. WHAT DO YOU KNOW ABOUT THE ABSORPTION OF WATER BY PLANTS?
  4. DO YOU KNOW ABOUT CARNIVOROUS PLANTS?
  5. WHAT DO YOU KNOW ABOUT THE SURVIVAL OF PLANTS DURING WINTERS?
  6. WHAT DO YOU KNOW ABOUT THE GERMINATION OF SEEDS?
  7. WHAT DO YOU KNOW ABOUT THE TRANSPORT OF WATER FROM ROOTS TO THE
  8. WHAT DOVOL
  9. WHAT DO YOU KNOW
  10. WHAT DO YOU KNOW ABOUT PEANUTS?
  11. WHAT DO YOU
  12. DO YOU KNOW ABOUT THE OLDEST LIVING CLONED PLANT ON THE EARTH?
  13. DO YOU KNOW ABOUT THE SURVIVAL OF A FOREST AFTER A FIRE?
  14. WHAT DO YOU KNOW ABOUT REPRODUCTION IN PLANTS BY THEMSELVES?
  15. WHAT DO YOU KNOW ABOUT UNDERWATER PLANTS?
  16. WHAT DO YOU KNOW ABOUT EPIPHYTIC AND PARASITIC PLANTS?
  17. WHAT DO YOU KNOW ABOUT CINCHONA TREES?
  18. WHAT DO YOU KNOW ABOUT BAMBOO PLANTS?
  19. WHAT DO YOU KNOW ABOUT THE PLANTS THAT EXISTED DURING THE DAYS
  20. OF DINOSAURS AND STILL LIVE TODAY IN THEIR ORIGINAL FORM?
  21. WHAT DO YOU KNOW ABOUT THE PLANTS THAT APPEAR TO FLOAT ON WATER?
  22. WHAT DO YOU KNOW ABOUT THE SURVIVAL OF PLANTS IN DESERTS?
  23. WHAT DO YOU KNOW ABOUT THE VARIOUS USES OF EBONY?

WHAT DO YOU KNOW ABOUT THE ABSORPTION OF WATER BY PLANTS?

It is true that plants need a lot of water to stay healthy. Plants are mostly made of water. A pumpkin, for example, is 94%
water. If we do not water plants, they will wilt and eventually
die. Most of the water we give to a plant does not stay in its body. The water passes through the plant and evaporates into the air. Plants absorb most of their water through their roots. If you observe the ends of the roots carefully you will see that they look furry. This fur’ is made of the rool hair. This is where most of the water is absorbed. From the roots, the water travels up the stem in very thin tubes or vessels. Then, it moves towards the leaves. The water travelling through a plant and the substances dissolved in it is called sap. Eventually, the water arrives in the leaf where it escapes into the air as water vapour. The evaporation of water from the leaves of plants is called transpiration. The water vapour passes through microscopic pores in the leaf surface called stomata.

WHAT DO YOU KNOW ABOUT CARNIVOROUS PLANTS?

There are some plants which capture and eat insects. Still, they are green in colour. This is because these plants grow in the soil which is very poor in mineral content, especially nitrogen and phosphorus. These plants, called camnivorous plants, make organic matter for their bodies by photo- synthesis and they eat insects to obtain certain minerals. The sundew is a carnivorous plant which is found in Europe. It has leaves which are brightly coloured to attract the insects. These leaves are also covered with sticky hair which traps the insects which land on them. The pitcher plant is another carnivorous plant. Its leaves are shaped like tubes, which collect rain water. There is a sweet subsiance around the rim of each tube which attracts insects. Once the insect has entered the tube, it is prevented from escaping by small, slippery hair which points downwards. Eventually, the insect exhausts itself by its effort to escape and slides into the water. The pitcher plant releases juices which digest the insect.

WHAT DO YOU KNOW ABOUT THE SURVIVAL OF PLANTS DURING WINTERS?

It is difficult for plants to survive in winters. The days are shorter and there is less sunlight. The cold temperature slows down their growth. Often, the temperature drops below zero degree, freezes the water and makes it inaccessible to plants. Such conditions are sure to kill all plants if they do not have techniques for survival. Some plants enter a resting stage. The plants which show new growth above ground year after year are called perennial plants. The part of each of these plants above ground dies over the winter months, while underground storage organs assure the survival of that plant for the following spring. A bulb is an example of an underground storage organ. Annual plants are those which live for only one year. In the cold winter months, only their seeds survive and the plants grow when spring comes. Sunflowers are considered annuals because they grow for one year and die. Each flower leaves behind many seeds which can grow into new plants.

WHAT DO YOU KNOW ABOUT THE GERMINATION OF SEEDS?

In general, most seeds germinate of temperatures between 10°C and 35-C Some seeds, however, need o period of cold conditions before they germinate. For example, cherry seeds germinate better if they are kept humid at 5 C, for 16 weeks. these seeds are kept at 25 C, they do not germinate Water is also important for the germination of seeds. A light fall of rain may be enough to start the germination of some seeds. For desert plants, the seeds often need to be sooked for several hours before they germinate. Most seeds germinale quite easily in the dark. Some seeds, however, need to be exposed to the light for a certain time before they germinate. For example, the seeds of the birch tree need 8 successive days and about 10 hours of sunlight before they germinate. The seed coat or testa which protects the
seed from damage or disease is often hard and waterproof. Some seeds do not germinate until the seed coat has been removed. Once the seed coat is removed, water enters and the embryo starts respiring. The seed coat may get removed when the soil particles rub against the seed coat and wear it away.

WHAT DO YOU KNOW ABOUT THE TRANSPORT OF WATER FROM ROOTS TO THE OP IN THE GIANT REDWOOD TREE?

A redwood reaches a height of about 100 metres which is as tall as a 30-storey building. It has a system of inter- connected wood cells for carrying water The hollow, short thin cells are stacked intricately to form an incredibly tall column. These cells are dead wood that function as pipes with pitted openings along the sides of the pipe for water to pass between adjacent cells. The small cells rarely exceed o quarter of an inch in length. These form a continuous column of water within this pipe in order to move water through the pipe. Two forces move the water: a push and a pull. Roots do most of the pushing and leaves do most of the pulling. Water which evaporates from the leaves starts the suction process. Water molecules evaporate from a leaf and pull on the molecules around it as they depart. This creates a small suction in the water column and pulls water from adjacent water- conducting leaf cells. These mole- cules, in turn, attract those around them. The chain continues to the ground and moves water from the roots to the tree top.

WHAT DO YOU KNOW ABOUT THE MOST POISONOUS PLANT?

The castor bean plant is the most deadly of all plants. If you eat a single castor bean or say two, you may die. If you live beyond three to live days, you will probably survive. Costor beans (not true beons, but rather seeds) contain o poison, called ricin. Il eaten it prevents the calls of the body from making proteins die without the proteins. The resulting damage to the body can be greot enough to kill o person eventually. The stalked leaves of the castor bean plant consist of eight radiating, pointed leaflets with slightly serrated edges and prominent central veins. Many varieties are green, but some are
reddish brown. The flowers are green and inconspicuous, but pink or red in the pigmented varieties. Costor beans are pressed to extract castor oil which is used for medicinal purposes.

WHAT DO YOU KNOW ABOUT PEANUTS?

Peanuts grow well in any sandy place where it’s warm for 120 to 140 days, moderately rainy (25 to 50 inches yearly) and no frost. The plant originated in Souih America, perhaps Brazil or Bolivia. Now, it is grown worldwide. Farmers plant peanuts by seed. The seed sprouts, grows about 18 inches and bears light green leaves. Yellow flowers appear and bloom for about a month. The plant pollinates itselt usually, but occasionally, bees transfer the pollen to another plant. Afler fertilization, the flowers fade and the young fruit forms a pointed stalk called a peg points and grows downwards. The fruits (.e. peanuis) develop woody outer shells (the peanut shells). Then, the pointed fruits bury themselves in the ground. They continue to mature underground but ripen at different times-anywhere from 90 to over 150 days. Afterwards, they are harvested. peg. The

WHAT DO YOU KNOW ABOUT THE OLDEST LIVING CLONED PLANT ON THE EARTH?

King’s holly (Lomatia fasmanica) is the oldest living cloned plant on the Earth. This plant is 43,600 years old. In 1937, Deny king discovered the plant while mining tin by hand in the remote southwest of Tasmania. The plant was named in the King’s honour. This plant has shiny green leaves and bears pink flowers, but yields neither fruit nor seeds. All the plants of this species ore technically separate. Each of these plants has its own rool system. It reproduces itself by dropping branch pieces that take roots. It can only reproduce itself by cloning genetically identical bushes. Investigators have found the fossil of the leat fragments identical to the living bush 5.3 miles (8.5km) away. The cell structure and shape of the fossil are the same as those of the living plant. It means this ancient plant was triploid (having three times the haploid number of chromosomes) also. The life-span of King’s holly is approximately 300 years, but the plant has been cloning itself for at least 43,600 years.

WHAT DO YOU KNOW ABOUT THE SURVIVAL OF A FOREST AFTER A FIRE?

After a fire has occurred, the soil becomes less acidic and the amount of nutrients available to plants always increase That is why plants re-grow quickly after a fire. Fires usually occur in the evergreen forests of pines, spruces and firs which grow in hot, dry countries. Fires don’t burn everything uniformly. 5 % of these forests escape the fire probably because of the wet land. These patches provide seeds for the re-growih. Red and white pine trees branch high above the ground, away from a seething surface fire. Moreover, their thick bark can withstand low-level fires and, hence, they survive such fires. Seeds in Jack-pine cones can withstand temperatures of 900° Celsius (1,700° Fahrenheit) for short times. Warmth from the fire encourages the cones to open and release seeds. Within five to ten years, the forest is re-seeded. White birch and trembling aspen re- sprout from their roots, even if badly burned.

WHAT DO YOU KNOW ABOUT REPRODUCTION IN PLANTS BY THEMSELVES ?

Many plants can propogole them selves by vegetative reproduction, In this process, part of a plant separates off, takes root and grows into a new plant. It is a process by which a new plant arises without the new comm production of seeds. It is found mostly in herbaceous plants and involves structural modifications of the stem, roots and in some cases the leaf also. Some plants produce bulbils or small bulbs Old con that develop on the stem or in the place of flowers. These bulbils drop off and grow into new plants. Similarly, some plants use underground storage organs. Such organs include rhizomes (horizontal, underground stems) like ginger, the branches of which produce new plants. Corms which separate from the parent grow into new plants. Other propogative structures are runners and stolons which are creeping horizontal stems that take roots and produce new plants.

WHAT DO YOU KNOW ABOUT UNDERWATER PLANTS?

Plants which grow submerged in water are called wetland plants or hydrophytes. Some plants may grow partially in water like the woter hyacinth and some plants moy grow completely in water like the pond weed These plants have special adaptations to survive in this habitat. They have numerous air spaces inside their stems, leaves and roots which help exchange gases in addition to
providing buoyancy. Submerged plants generally have no cuticles or waterproof coverings. This enables them to absorb minerals and goses directly from the water. The primary function of cuticles is to prevent water loss. Thus, most hydrophytes have no need for cuticles. The gos- exchange pores or stomata are not
present in the plants that are completely submerged in water Whereas, in partially submerged plants with floating leaves like the water lilies, stomata are found on the upper leaf surfaces.

WHAT DO YOU KNOW ABOUT EPIPHYTIC AND PARASITIC PLANTS?

Both epiphytic and parasitic plants grow on other living plants, but there are some differences. Epiphytic plants live above the ground level on the stems and branches of other plants. They get
their supply of water from trapped rainwater and moisture in the air Besides, they get minerals from the organic matter that collects on the surface of the plant on which they grow. Like other green plants, they manufacture their own food by photosynthesis. Examples of epiphytes are tropical orchids, bromelaids and some mosses that live in temperate regions. Parasitic plants get all their nutrient requirements from the plants on which they grow. They produce root-like organs which penetrate the stems or roois of the host plants. Then, they grow
inwards and merge with the vascular tissues of the host plants from which they get their supply of water and minerals. Fully parasitic plants lack chlorophyll, but partially parasiticplants like the mistletoe have green leaves and, hence, produce their own food by photosynthesis.

WHAT DO YOU KNOW ABOUT CINCHONA TREES?

The cinchong tree is a tropical tree which grows from 5 to 15 metres in height. It is on evergreen tree with brood and Hot leaves with a shiny green surface and large veins. The flowers are white and elongated, covered thickly with silky hair. The cinchong tree is native to the rainforests of the eastern slope of the Amazonian Andes of South America where it is colled the “ever free. It is called so because it is the primary source of the anit-malarial drug, ie, quinine Quinine is a chemical thot cures malaria. It is found in the bark of the cinchona tree. People in Peru still use the cinchong as the best remedy for fevers, digestive problems and infections. As a bitter tonic, cinchono stimulates saliva, digestive secretions and appetite. Moreover, it improves the weak digestive function. It is also used in making gargles for sore, and infected throats. In India,
cinchona is used to treat sciatica (pain, numbness or weakness that travels from the low back through the buttocks and down the large sciatic nerve in the back of the leg) and dysentery.

WHAT DO YOU KNOW ABOUT BAMBOO PLANTS?

Bomboo, a plant of the family Gramineae, is the longest grass in the world. Some bamboo plants are as short as 30 cm, while giant timber bamboo can grow to a height of over 40 metres or 100 feet. A bamboo plant consists of a hollow culm or stem with nodes or joints between the segments of the stem, and oval leaves. It is also perhaps the fastest growing plant with some varieties growing at the rate of 5 cm per hour or 1.5 metres a day. Within a few months, new shoots of the Moso species grow up to a height of 12 to 15 metres. New shoots of some of the larger species can grow over 1 metre per day. Once a bamboo shoot has reached full height and produces leaves, it never gets any taller. The bamboo plant has a wide variety of uses, ranging from being purely decorative to being an important source of fuel. It is utilised as wood in construction work, furniture, utensils, fibre and paper. Bamboo charcoal makes a good fuel because it is three times as porous as wood, and releases more energy. Bamboo shoots are also delicious to eat, whereas the leaves provide fodder for animals like the panda.

WHAT DO YOU KNOW ABOUT THE PLANTS THAT EXISTED DURING THE DAYS OF DINOSAURS AND STILL LIVE TODAY IN THEIR ORIGINAL FORM?

Dinosaurs roamed the land from 225 to 65 million years ago. During that time, different plants evolved and some, like seed ferns, also died out. Others like mosses horse fails, ferns, conifers.cycods, magnolias lasted for long and remained unchanged. Mosses edged from the sea onto lavo-strewn land, almost 500 million years ago, but were severely handicapped. They had no roots and still don’t. Then around 400 million years ago, there came a group of three plants Club mosses, horse tails and fems with roots. The herds of long-necked Sauropod dinosaurs fed on the ferns. The descendants of these plants thrive today without much change. The club mosses and horse tails grew tall (100 feet, 30m). Seeds evolved next, about 225 million years ago. Conifers and cycad trees were among the first plants to produce seeds. Camarasaurs and Brachiosaurs hacked these early trees off with their blade-like teeth. These dinosaurs had steel-lined stomachs. Today, no mammal eats conifers because of their foul-tasting, toxic sap. Dinosaurs were alive around 100 million years ago when the first flowering plants appeared. Magnolias flourish today much as they did when dinosaurs roamed.

WHAT DO YOU KNOW ABOUT THE PLANTS THAT APPEAR TO FLOAT ON WATER?

Some water plants are rooted in the mud and have their leaves above the surface, Such plants appear to floor on water. The water lily, also known as pond lily, is a lorge oquatic plant which appears to floot on water. The long, strong leaves and flower stalks of the water lily rise from the muddy bottom below. The leaves are kidney-shaped and are usually seen iloating on the surface of water, but may also be submerged. Giant water lilies have huge leaves with the edges upturned like shallow pans to keep them afloat. The leaves of the Royal or Amazon lily can be 2 metres across The flowers may be 30 cm across Another grass-like water plant that grows on River Nile is the papyrus Ancient Egyptians flattened their stems to write on. The word ‘paper comes from papyrus. Some species of buttercup float slightly submerged in water, only the flowers extend above the water. Their leaves and roots are long and thin and almost hair-like. The long roots and thin leaves also provide a greater surface area for the uptake of oxygen mineral solutes.

WHAT DO YOU KNOW ABOUT THE SURVIVAL OF PLANTS IN DESERTS?

Plants which grow in dry regions are known as xerophilous The roots of these plants spread out horizontally close to the surface of the soil. In this way, the roots can soak up whatever rain falls before the the heat of the Sun evaporates all the moisture. Some roots go down deep into the soil to search for damper places. The stalks of desert plants have no leaves and are covered with waxy materials which prevent moisture from evaporating from the plants. These plants are even covered with sharp thorns or spines to stop animals from eating them. Many plants produce beautiful flowers and fruits after rains. The stems of most cacti are massive and can store large amounts of water that sustain the plants during prolonged drought. Cacti have thick waxy cuticles on their stems, which act as water proofing skins. Also, the pores called stomata in the cactus skin that are necessary for the uptake of carbon dioxide tend to

open only at night. As a result, ver little water is lost.

WHAT DO YOU KNOW ABOUT THE VARIOUS USES OF EBONY?

Ebony is the hard black wood of various tropical treas marked for their hard and beautiful wood. There are more than 300 species of ebony, ranging in sizes from shrubs to trees, taller than 100 A (30 m). The best commercial ebony comes from India, Madagascar, Nigeria, Zaire and the Celebes Islands. Only the black or brown heartwood is used commercially. The leaves of the plant are brood and vary in length according to the size of the plant. The flowers ore white or greenish-white, which are eaten by animals and humans because of their sweetness when ripe. The leaves and other parts of the tree are used in traditional medicine to treat intestinal parasites, wounds, dysentery and fever. The wood of the ebony is very dense. It is used for many purposes, including tool and knife handles, furniture, inlay work, wall panelling, golf club heads and musical instruments. For many years, ebony had been used for making the black keys on the piano.

1.       WHAT IS BAMBOO – TREE OR GRASS?

2.       WHAT ARE ALGAE?

3.       WHAT ARE THE USES OF THE EUCALYPTUS TREE?

4.       WHAT ARE STOMATA?

5.       WHAT IS BONSAI AND HOW SHOULD IT BE TAKEN CARE OF?

6.       WHAT IS GRAFTING?

7.       WHAT ARE HERBS?

8.       WHAT ARE THE DIFFERENT KINDS OF NUTS?

9.       WHAT CAUSES THE DIFFERENCE BETWEEN THE TASTES OF FRUITS?

10.   WHAT ARE FUNGI?

11.   WHAT IS THE IMPORTANCE OF PLANTS?

12.   WHAT IS BARK AND WHAT ARE ITS USES?

13.   WHAT ARE LICHENS?

14.   WHAT ARE THE DIFFERENT PARTS OF A FLOWER?

15.   WHAT ARE THE USES OF THE WILLOW TREE?

16.   WHAT DO YOU MEAN BY SEAWEEDS?

17.   WHAT ARE THE DIFFERENT KINDS OF ROSES?

 

18.   WHAT DO YOU MEAN BY CARNIVOROUS PLANTS?

 WHAT IS BAMBOO – TREE OR GRASS? 

 Bamboo is thought to be a free but actually it is a kind of grass. It is the largest member of the grass family. Bamboo is the fastest growing woody plant in the world. Its accelerated growth rate (up to 3-4 feet/day) is due to a unique rhizome system and is dependent on local soil and climatic conditions. There are over five hundred types of bamboos. They all consist of smooth, hollow, joined stems with a strong watertight partition at each joint. All grow very quickly They grow upwards at a rate of 41 centimetres a day and can grow up to a height of 36 metres. While most bamboos flower every year, there are some that flower only three or four times in a century. The flowers are very similar to those of other grasses. The fruits are normally like grasses and some kinds are like nuts. Bamboo has numerous advantages. In the United States, bamboo is mainly used in fishing poles, walking sticks and phonograph needles. Bamboo has long been used to make paper. 

 WHAT ARE ALGAE?

   Algae are the most primitive form of life. They are that live in oceans, lokes, rivers and damp mud. Algae vary in size from single-celled microscopic organisms to huge seaweeds over 60m long. For example, the largest known algo is the giant kelp which grows up to 65m in length. Algae do not have leaves, roots or stems like other plants, but they have chlorophyll in them which enables them to get their energy from sunlight. Algae may be tiny, but they form a vital source of food for sea creatures from shrimps to whales. They also provide most of the oxygen which water creatures need for life. Algae are used by humans in many ways. They are used as fertilizers, soil conditioners and are a source of livestock feed. Green algae are usually found in freshwater, whereas red or brown algae are found in the warm pigments. seas. The chlorophyll of red or brown algae is masked by other 

 WHAT ARE THE USES OF THE EUCALYPTUS TREE?

  Erical trees make up of over 400 species of Australian tres They grow best in the morked wet and dry seasons of the eucalyphus tree ore long term and leathery which are cut pressed and men steamed to make eucaliphs oil. The ou of eucalyptus contains cineole, a potent antiseptic that helps kill bacteria and fungi, It helps increase cardiac action. It is taken in all types of fever. It helps purity blood. It lowers blood sugar it brings relief to the patients of asthma and bronchitis. The most important tree grown for oil is the blue mallee. The blue gum trees are usually found in North Americo. Some eucalyptus trees give resins, which are used to protect ships from worms and other animals which make holes in ships. Another Australian eucalyptus tree named jarrah gives red wood which looks like mahogany Other eucalyptus wood is used to make everything from bats to telegraph poles 

 WHAT ARE STOMATA?

  Stomata ore microscopic pores found on the under side of leaves function to vary the widths of the pores. Plants carry on the processo Stomata are bounded by two half moon-shaped guard cells the leaves. Some of these materials are gaseous (carbon dioxide), sonive photosynthesis by combining together several ingredients in their are liquid (water) and one is energy (sunlight). The JO transfer of ingredients occurs, shifting the CO., light and water from the surrounding atmosphere to the plant. In light, the guard cells swell, causing the pore to be at its widest, and CO, diffuses into the leaf and into the cells to be assimilated in photosynthesis. In the dark or guard under drought conditions, the cells are not turgid, the stomata are closed and no photosynthesis takes place. Opening of the stomata allows not only CO2 to diffuse into the leaf, but also water vapour to diffuse out of the leaf. 

 WHAT IS BONSAI AND HOW SHOULD IT BE TAKEN CARE OF? 

 Bonsai in literally a plant wally o tres or shrub) grown in a frayor pon, The first plants grown pols were in Egypt about 4,000 years ago mostly for practical reunos, mobility and convenience. The Greeks, the Babylonians, the Persians and the Hindus copied the techniques, The Chinese were the first to plant trees in pols for oesthetic purposes obout 200 AD. A free planted in a small pot is not o bonsai until thos been pruned, shaped and troined into the desired shape. Bonsai is kept small by corelul control of its growing conditions. Only branches important to the overall design of a bonsai are allowed to remain and unwanted growth is pruned away Roots are confined to a pot and are periodically clipped. Bonsoi usually needs to be watered every day or two. The best time to water is early in the day or late in the afternoon at the same time every day. In general, the soil should be moist, not soaking wel, and not dry. Bonsoi must periodically be repotted to supply the pot-bound root system with fresh soil,  

WHAT IS GRAFTING?  

Grafting is a method of plant propagation widely used in horticulture with those of another. It is most commonly used for the propagation of gardening), where the fissues of one plant are encouraged to fuse trees and shrubs grown commercially. A part of one plant is connected lo a part of another plant, the two, then, grow together to become a Gc ne single plant. The top part, which will produce the branches, leaves, flowers, and fruit, is known as the “scion”. The lower portion, which produces the root system and the very bottom part of the trunk, is known as the rootstock. The scar where the two are joined, and which may remain visible ihroughout the life of the tree, is the grafi union. For successful grafting to take place, the vascular cambium tissues of the stock and scion plants must be placed in contact with each other. Both tissues must be kept alive until the graft has taken, usually a period of a few weeks. ge 46  

WHAT ARE HERBS?

  fragrant leaves and stems of plants whose stems are not Herbs are woody (exceptions like rosemary). They are small plants whose leaves can be used to make medicines, lood or perfumes. Most herbs are perennial and have soft stems. Basil, a sweet mild herb which has a peppery faste, is used in solado age is another which is thought to have special healing qualities. Its leaves are used fresh or dried. It is also a great flavouring for meat. Rosemary is a coastal plant and is believed to improve memory. Thyme is another herb which comes from the Mediterranean. It is very strong and spicy and is mainly used fresh or dried. It is one of the best herbs for seafood, but can be used with poultry, meal and vegetables too, Parsley thyme and a bay leaf may be tied in a muslin cloth and hung in soups while cooking to give them extra flavours.

 

WHAT ARE THE DIFFERENT KINDS OF NUTS? 

 

 Actually it is a seed wrapped in a hard shell. Nuts are a concentrare A nut is a fruit with a single seed in which the outside has gone hond contain more food energy than sugar and more proteins, minerals nutritious food which contains 10-20% protein and 50% tat. Peon vitamins Almonds COM from trees native to Sous West Asia, but are now grown all over the world one The almond tree with white flowers produces bittee almonds, which are used in the manufacture of drugs used in medicines. Sweet almonds come from the tree with pink blossoms, which are grown in abundance in western Asia, Mediterranean regions and in Calitomia. Coconut was previously grown along the East Indies Coast and in the South Sea. But now, it is found in the tropics of all continents Coconut is rich in protein. Its oil is used in cooking. The brazil nut is very hard to crack, but very delicious. I grows in clusters of twenty or more tightly packed in a hard, round shell.

  WHAT CAUSES THE DIFFERENCE BETWEEN THE TASTES OF FRUITS?  

Each fruit has a different taste which varies in some way from the taste of any other fruit. The foste of any fruit depends on the compounds it bears. In general, a fruit consists of fructose (natural sugar), organic acids, vitamins, starch, proteins, minerals and cellulose. All these materials are present in differeni proportions in different fruits. Fruits having more fructose-content taste sweeter, while those having more acids taste sour Orange is a fruit which comprises almost equal quantities of fructose and acids. Hence, it tastes both sweet and sour. In general, raw fruits contain more acids, but on ripening, the quantity of acid decreases and the amount of sugar increases. Therefore, raw mangoes are sour, but ripe ones are sweet. Some fruits, like lemons, do not taste sweet even after ripening. This is because of the excessive amount of acids. 

WHAT ARE FUNGI? 

 Fungi are not plants, because they have no chlorophyll to make their food. They are a group of 50,000 species which include mushrooms, toadstools, mould, mildew and yeast. Since fungi cannot make their own food, they live on other plants and animals as parasites. Fungi are made of numerous thread-like structures called hyphae, which absorb the chemicals they feed on. Fungi feed on the host by releasing chemicals called enzymes, which break down chemicals in their host. Fungi which live on living organisms are called parasitic fungi, whereas fungi which live on dead plants and animals are called saprophytic. The most poisonous of all fungi is the destroying angel. It can kill anyone who eats it once. Fly agaric is o toadstool which is a poisonous mushroom. It is easy to recognize from its spotted red cap. The field mushroom grown wild or cultivated is the mushroom most widely eaten. 

WHAT IS THE IMPORTANCE OF PLANTS?  

Plants are helptul for the survival of human beings in several ways. They not only provide us with food, but also give us oxygen to survive. Plants consume carbon dioxide which we release and give off oxygen which human beings require to survive. Shampoos, perfumes, bath oils and creams are made from sweet smelling plants. The corks that seal the bottles of wine are made from the bark (cork) of the oak tree. Besides this, plants help us to make lots of useful things such as paper, cloth and medicines. The coal which we use today comes from plants which grew even before dinosaurs existed. Trees also provide us with fuel, timber, resins, varnishes, dyes, rubber and many more things. Softwood is obtained from coniferous trees such as pine, larch, fir and spruce. 75-80% of the natural forests of northern Asia, Europe and the USA are softwood. Hardwood timber is obtained from broad-leaved trees like the oak. 

WHAT IS BARK AND WHAT ARE ITS USES?  

composed of waterproof cork cells. One of its main function is The outer covering of the slem of woody plants is known as bark. It is shield the inner and more solf structures of the tree. It not only keeps them from drying out but also protects them against outside injuries The bark protects a layer of food conducting tissue called the phloer GO non or inner bark. The process by which bark is formed may continue year after year As the woody stem increases in size, the outer bark of the dead cork cells give way; it may split to form grooves or shed off or peel of A layer of reproductive cells, called the cork cambium, produces new cork cells to replace the old ones. The bark spongy bark of the hemlock tree is used in the tanning of leather Bottle corks are made from the thick, of the cork ook, which grows in the Mediterranean region. Quinine is made from the bark of the cinchona tree. Extracts from the bark of other trees are used for flavouring and as medicines ?  

WHAT ARE LICHENS?  

Lichens are a wonderful partnership of algae and fungi. There are about 20,000 species of lichens. They are usually flat and crust-like, with no roots or stems. They often grow on roofs or soil, but most grow on rocks or the branches of trees. The algae in lichens make food from sunlight to feed the fungi, whereas the fungi make a protective layer around the algae and hold water. Lichens can grow only when moistened by rain. They grow very slowly, but can eventually cover very large areas. Some lichens grow a fraction of a millimeters in a year. Lichens could survive in many places where other plants would die, for example, the Arctic, deserts and mountain tops. Some Arctic lichens are believed to be 4,000 years old. Lichens are very sensitive to air pollution, especially sulphur dioxide. Hence, they are used by scientists to indicate air pollution. Scandinavian reindeer moss is a lichen eaten by reindeers. It is also exported to Germany for decorations. 

WHAT ARE THE DIFFERENT PARTS OF A FLOWER? 

 Flowers are the reproductive organs of a plant. Usually, flowers have both the male and female reproductive parts. The male reproductive part consists of stamens, which are made up of filaments and anthers Filaments are tiny stalks which hold onthers. These anthers produce tiny dust-like grains called pollen. The female reproductive part consists of the carpel which is made up of style, stigma, ovary and ovules. The ovary is hidden in a bulb-shaped receptacle at the base of the flower. Inside the ovary are one or more ovules, which become seeds if the flower is not fertilized. In order for a flower to be fertilized, pollen must be transferred from the male stamento the female stigma. That is why flowers are colourful and scented so that bees may be attracted towards them to carry on the process of fertilization. 

WHAT ARE THE USES OF THE WILLOW TREE? 

 Willow trees are usually found in moist habitats such as flood plains and on river banks. These trees grow very rapidly in this climate. The willow tree is very useful in several ways. Its leaves provide food for the wildlife. The leaves and bark of the willow tree have been mentioned in ancient texts from Assyria, Sumer and Egypt as a remedy for aches and fever. The bark of the willow free contains an active compound salicin, which is used in making many medicines. Aspirin is a derivative of salicylic acid, which was synthesized from derivatives of ihe willow bark. The twigs of the common osier are grown for the use in basket making, whereas the light bui dent-resistant wood of other willow trees is used in making artificial limbs, wooden shoes and cricket bats, brooms, cradles, boards, chairs and other furniture, dolls, flutes, poles, toys, tool handles, wands and whistles. 

WHAT DO YOU MEAN BY SEAWEEDS?

  The term seaweed refers to the large marine algae that grow almost exclusively in the shallow waters of the edge of the world’s oceans They provide home and food for many different seo animals, lend beauty to the underwater landscape and are directly valuable to mon os food and industrial row material. Seaweeds can make their own food with the help of sunlight, but they are devoid of roots, stems, leaves and flowers. Instead of roots, seaweeds have ‘holdfasts which look like roots, Seoweeds may be red, green or brown algoe. Red algae are small and fer-like and grow 30-60 metres down in the tropical seas. Brown algae like the giant kelp are big, but grow down to about 20 metres only, usually in cold waters. Gulfweed floats so densely on the Sargasso Sea which covers an area of 5.2 million square km east of West Indies that it looks like a green meadow. 

WHAT ARE THE DIFFERENT KINDS OF ROSES? 

 Roses are one of the most popular garden flowers. This is because of their lovely perfumes and beautiful blooms. Wild roses have smaller flowers with usually single layers of five petals. Gorden roses have big flowers with sets of five petals in two or more layers. There are about 100 species of wild roses, but all the present-day garden roses were created by crossing 10 Asian species. Today, there are about 13,000 varieties of garden roses. Garden roses are divided on the basis of their time to bloom. Old roses bloom only once in a year in early summer, for example: yellow briers, damask roses etc. Perpetual roses bloom twice in early summer and in autumn, for example: hybrid perpetuals. Ever- blooming hybrids bloom all summer, such as floribundas, hybrid teas, gloribundas and polyanthas. Attar of roses is a perfume made from roses, especially damask roses. 

WHAT DO YOU MEAN BY CARNIVOROUS PLANTS? 

 Camivorous plants are those plants which trap insects for their food insufficient. Hence, they eat insects to fulfil the quantity of nitrogen These plants survive in places where the availability of nitrogen is required. An insect is lured into the jow-like leaf trap of the Venus fly trap with nectar Once the insect has landed, the jaws shut on the victim in a fraction of a second. Immediately, the plant secretes juices that drown and then dissolve the insect. The leaves of the sundew are covered in tentacles that ooze a sticky substance known as mucilage. Insects are trapped in its tentacles and are then suffocated within ten seconds. The pitcher plant is another carnivorous plant. The inside of the tubular shaped leaf is lined with downward pointing hair. The hair blocks an insect from climbing up the tube and escaping. The fluid in the bottom of the tube contains digestive juices that digest the prey.   

  1. HOW ARE SEEDS ESSENTIAL TO PLANTS?
  2. HOW DOES PHOTOSYNTHESIS TAKE PLACE?
  3. HOW DOES POLLINATION TAKE PLACE?
  4. HOW DO FLOWERS GET THEIR SCENT?
  5. HOW DO MUSHROOMS GROW?
  6. HOW DO PLANTS SURVIVE IN THE DESERT?
  7. How is CACTUS ADAPTED TO HOLD WATER?
  8. HOW ARE GRAPES USED IN VARIOUS WAYS?
  9. HOW IS RICE GROWN?
  10. HOW IS SUGAR MADE?
  11. HOW DO PINE TREES STAY GREEN ALL THE YEAR?
  12. HOW DOES NATURE SCATTER SEEDS?
  13. HOW MANY KINDS OF GRASSES ARE THERE?
  14. HOW DO WEEDS SPREAD?
  15. HOW ARE ROOTS ESSENTIAL TO PLANTS?
  16. HOW DOES THE SHAPE OF A LEAF VARY?
  17. HOW DOES THE WHEAT PLANT LOOK LIKE?
  18. HOW DO LEAVES CHANGE THEIR COLOURS?

 HOW ARE SEEDS ESSENTIAL TO PLANTS?    

  Seeds are the main means by    which flowering plants reproduce    and spread. Alter a plant has been    fertilized, the egg cells develop    into seeds from which a new plant    develops. When the seeds mature,    they contain an embryo of a new    plant. They also contain food    storage to nourish the embryo,    until it has developed roots and    leaves. The seeds lie dormant until    conditions are apt for them to    germinate. The seeds are    wrapped in hard shells to protect    them from drying out. Many seeds    are scattered by birds or animals.    The animals eat the fruit. As a    result, the seeds get deposited in their    droppings. Some plants have seeds    with hooks that cling onto the animal’s    fur. Some plants like strawberry do not    depend on seeds for reproduction    These plants spread out stems at the    end of which are small plantlets. These    plantlets take the form of roots and    become new plants       

HOW DOES PHOTOSYNTHESIS TAKE PLACE?

 Plants use sunlight to combine    carbon dioxide from the air with    water in order to make sugary food    required by the plants. This process is    called photosynthesis. Photosynthesis    takes place in leaves in two cells    palisade and spongy cells. Within    these cells are tiny packages called    chloroplasts which are filled with a    througe    CHEMICAL ENERGY CARBON DIOXIDE SUGAR    jelly-like substance called stroma.    The stroma contains the chemical    called chlorophyll which makes    leaves green. The leaf draws    carbon dioxide through pores    called siomata. It also draws water from the ground through veins and    siems. When the sun shines, chlorophyll soaks up its energy and uses it    to split water into hydrogen and    oxygen. The hydrogen mixes with     carbon dioxide to make sugar. Oxygen    is released through the stomata. Sugar    is transported along the plant and    some sugar is combined into large    molecules called starches, which are    easy for the plant to store. 

  HOW DOES POLLINATION TAKE PLACE?  

  All plants must reproduce themselves in order to survive. Most    flowering plants produce seeds    that grow into new plants. There    are two types of pollination-self    pollination and cross pollination.    In self-pollination, the male and    the female reproductive organs    are on the same flower. But in    cross-pollination, the male and    the female ,eproductive organs    are on the different flowers of the    same species. Pollen is produced    by the male reproductive organ called the stamen. This pollen is    carried to the carpel, which is the female reproductive organ. The    lower part of the carpel is the ovule which develops into a seed when    the pollen comes into contact with the ovary. This is known as    pollination. For cross-pollination to    take place, animals and Nature play a    very important role. Bees and insects    are the ones which are mostly involved    in the transfer of pollen.  

     HOW DO FLOWERS GET THEIR SCENT? 

  Certain oils present in the petals of flowers give the flowers their    fragrance. These oils are produced by the plant as part of its growing    process. These oils are very complex Under certain conditions, these    oils are decomposed and are formed into a volatile oil. When this oil    1    evaporates, we get the    fragrance from the flowers.    Different chemicals present    in the volatile oil are res-    ponsible for the difference    in the scent of flowers. This    ok    W    oil is also found in the    leaves, barks, roots, fruits    and seeds. For example,    oranges and lemons have    this oil in their fruits;    almonds in their seeds and    cinnamon in its bark. The first people to distil rose petals with water in    order to produce rose water were the    Arabians. This took place about 1,200    years ago

   HOW DO MUSHROOMS GROW?  

  Mushrooms are umbrella-shaped tungi. They do not have any roots,    stems or leaves. They have no    chlorophyll to manufacture    their own food. So, ihey feed    on either living or decaying    plants. The umbrella-shaped    part of the mushroom is called!    the fruiting body. Under the    surface, there is a mass of fine    stalk threads called the    mycelium. The threads which    make up the mycelium are    known as hyphoe, while help it to absorb food. The fruiting body is    covered with a protective cap. On the underside of the cap, there are    lots of thin sheels called gills which are covered with spores. The    fruiting body grows overnight after rainfall and lasts for just a few days.    The mycelium may survive underground for many years. The mycelium    threads grow from little spores which are shed from the fully grown    mushrooms. The spores are carried    away by the wind. When the spores fall    on surfaces suitable for growth, they    develop into new plants.

   HOW DO PLANTS SURVIVE IN THE DESERT?   

  In spite of the hot and    dry conditions of the    desert, several types of    Gok    new    This    plants have adapted    themselves to these    conditions. Some plants    with very long roots    find water in the dry    desert. For example,    the Mesquite has roots    that can go 50 metres    deep. Many desert    plants store water    either in their stems,    leaves or roots so that they may last through long periods of drought.    Some of these plants also have thick,    waxy skins which lessen the amount    of water loss through evaporation.    Pebble plants avoid the desert heat    by growing partly underground.    Some desert plants like the caper of    the Sahara Desert get their water    from the vapour in the air. Another    desert plant called the welwitschia    which grows in the coastal deserts of    south-west Africa gets most of its    water from the atmosphere.  

 HOW IS CACTUS ADAPTED TO HOLD WATER?  

   Most cacti grow in hot, dry regions, but a few are found in the    rainforests and on mountain tops. Cactus plants have sharp spines,    thick bulbous green    stems and no leaves. The    spines which are actually    the leaves are designed in    such a way that they lose    as little water as possible    through evaporation.    The spines also proiect    them from being eaten    away by animals. The fat    stems of cacti can hold a    lot of water so that they    may survive the hot and dry climate. They also have long roots which    lie close to the ground so that they may collect as much rainwater as    possible. Besides, long roots facilitate    them to gather water from a large    surface area. The cactus plant    produce big colourful flowers afte    every few years. If a piece of cactu    gets knocked off, it can take root in th    sand and grow into a new plant. 

  HOW ARE GRAPES USED IN VARIOUS WAYS?    

   Grapes are juicy, smooth    skinned berries that grow in tight    clusters on woody plants, called    vines. They may be black, blue,    green or purple in colours.    Grapes are grown in places    where there are warm summers    and mild winters, especially in    France, Italy, Spain, Australia,    Chile, Romania, Georgia, South Africa and California. Grapes for    eating fresh are called table grapes and they are bigger and sweeter    80% of the grapes are crushed to make wine. Wine from grapes was    made by ancient Egyptians about 5,000 years ago. Grapes are made    into wine by a process called fermentation. Grapes are also dried to    make raisins. The San Joaquin and Sacramento valleys of California    ore favourable for preparing raisins    and lead the world in their production.    Here, grapes ripen in August. They are    plucked from the vines and allowed to    lie in trays for about two to three    weeks. Then, they are further steamed    and soaked in special solutions to turn    them into raisins. 

  HOW IS RICE GROWN?

    About half of the population around the world thrives on a diet    consisting mainly of rice. Predominantly, such people live in Asia. Wild    rice thrives in the low water of lakes in north eastern Canada and in the    United States. The seeds    are sown in special beds    and, then, transferred to a    watery field after 25 to 50    days. Most rice known as    low land rice is grown on    flat, alluvial soil brought    there by water. Such soil is    normally found along the    shores of lakes or banks of    rivers. The fields are, then,    flooded by inlets from the canals or the river through gates in the walls.    The rice grower must keep at least 13 cm of water in the fields during    the growing season. As soon as the    leaves turn from green to yellow, the    fields are drained for harvesting. In    India, the process of growing rice    probably began around 3,000 B.C.  

 HOW IS SUGAR MADE? 

 Sugar is the sweet-tasting    natural substance. All green    plants make sugar. When we    speak of sugar, we mean    sucrose, the sugar we use    daily. It comes from sugar    cone or sugar beet. Sugar    cane is a tropical grass with    woody stems which grow    about 2-5 m tall, Sugar juice    is extracted from the cane by    shredding and crushing its stems.    Sugar juice is, then, warmed to let    the water evaporate. Hence,    crystals are formed. Sugar beet is    a turnip-like plant that grows in    temperate countries. Sugar juice    is extracted from the beet by    soaking the thin slices of the root    in hot water to dissolve the sugar.    White sugar is obtained from    sugar beet or by refining cane    sugar. Brown sugar such as    muscovado (a type of unrefined    sugar) and demerara are refined    cane sugar. 

HOW DO PINE TREES STAY GREEN ALL THE YEAR?     

  ne trees are evergreen conifers with long needle-like leaves. They    grow mostly in sondy or rocky soils in cool places. Pine trees remain    green all the year round. Leaves absorb    carbon dioxide (from the air), water and    minerals from the soil. The chlorophyll in    the leaves absorbs energy from the sun    and changes carbon dioxide and water    into sugar. This sugar constitutes the    primary food for the tree. At the same    time, leaves give off water in the process    of evaporation through millions of tiny    pores on their surface. In winter, when the    ground freezes, the trees are unable to    obtain a substantial amount of water.    Hence, the trees shed their leaves so that    they may not lose water by evaporation and hence, water is utilized in    manufacturing food. In case of pines,    firs and hemlocks that have narrow,    needle-like leaves with thick, waxy    outer coverings which help to avoid the    evaporation of water, the leaves of    these trees are not shed frequently. In    this way, pine trees remain evergreen    all the year. 

  HOW DOES NATURE SCATTER SEEDS?    

   For a plani to expand its type,    seeds are vital. But seeds    require appropriate conditions    for growth. There are various    methods by which seeds are    scattered to the right place. In    some seeds, the outer covering,    has hooks, barbs or spines. They    cling onto the fur of passing    animals and sometimes onto    the clothes of people and are,    hence, carried away. Some seeds grow in sticky berries. When the    birds feed on these berries, a few of the seeds cling onto the bills of the    birds and are thus carried off. The plants which grow in or close to the    water drop their seeds into the mud or water. As birds and animals walk    along the shore in search of food, mud sticks to their feet and, hence,    seeds are carried away. Some birds, insects and squirrels eat certain    inds of seeds and bury some in the mud for later use. They sometimes    forget about it and, hence, new plants    develop. Some birds and animals eat    the fruit and then deposit the seeds in    their droppings

 HOW MANY KINDS OF GRASSES ARE THERE?   

 There are about 4,500 kinds of grasses. All the cereals which we eat    such as wheat, maize, com, rice, barley, oais, rye and millet all are    grasses. We eat their seeds    or grains. The leaves and    stalks are usually left as    animal feed. Most of the    world’s sugar comes from    the grass, sugarcane. The    tallest of all grasses is the    bamboo which grows to a    height of more than 30    metres. The leaves of grasses    can be distinguished from    other plants in respect tha    they are arranged in two opposite rows on the    stem with a single leaf at each joint. The    flowers are usually not brightly coloured. One    of the most famous and important American    grass is the Kentucky bluegrass. Its nutritious    leaves and stems make it a rich pasture for    livestock. Due to its blue-green beauty, it    makes a dense, hardy turf when closely    clipped. This grass is popular for parks, lawns    and golf course

   HOW DO WEEDS SPREAD?  

   A weed is a wild plant which grows    where it is not wanted, especially among    crops or gorden plants. Most weeds are    harmful. Some are poisonous to cattle    ond horses, whereas others hamper    grown-up crops by robbing them of    sunlight, soil    , minerals and water.    Gok    spread by several means.    Weeds are    Ohen, they are carried from one place    to another in the form of fodder, dust or    rubbish. Most weeds like pimpernel,    nightshade, dodder and grasses    produce their seeds in such large    quantities that some of them are likely to    thrive, no matter what the    condition may be. Other    weeds have thread-like or    wing-like projections on    their seeds and fruits. These    make it possible for the    seeds to be carried away by    wind to far-off places.    Some of the most successful    weeds do not get scattered    by means of seeds.   

 HOW ARE ROOTS ESSENTIAL TO PLANTS?    

    Rools are those parts of the plant which    gow down into the soil or water to provide    anchor to the plant. Roots grow deep into    the soil to sook up all the water and    minerals which the plant requires for its    growth. Since trees grow to enormous    heights, it is the roots which balance the    soreod of branches above. Every root has    tiny root hair, which helps    to absorb water and mine-    rals. Roots are protected    at the end by a thimble-    shaped root cap. When a seed begins    to grow, its first root is called the    primary roof which branches into    secondary roots. In some plants like    the beetroot, the roots act as a food    store. Other plants like the carrot have    one single large root called the taproot    with just a few fine roots branching off.    Liverworts, hornworts and mosses do    not have true roots. Instead, they are    anchored to the ground by hair-like    structures called rhizoids that resemble    roots.  

 HOW DOES THE SHAPE OF A LEAF VARY?      

 Trees can be divided into two    colegories according to their    leaves broad leaved trees    and conifers with needle-like    leaves. Trees can be identified    from their leaves. Leaves vary    not only in shapes but also on    the basis of the number of    leaflets on the same stalk.    Leaves also vary in terms of    their leaflets which are either    paired or offset. Trees like    birches and poplars have    small triangular or ‘deltoid’    leaves, whereas aspens and alders have round leaves. Limes and    Indian bean trees have heart-shaped or ‘cordate’ leaves. Maples and    sycamores have leaves shaped a bit like hands and, hence, the leaves    are referred to as ‘palmate’. Ash and walnut trees have lots of leaflets    on the same stalk. It gives them a feathery or ‘pinnate’ look. Many    shrubs like magnolias and buddleias and trees like willow, cherry,    sweet chestnut and cork oaks have long narrow leaves.

    HOW DOES THE WHEAT PLANT LOOK LIKE?       

as one of the first crops ever planted and grown by formers, some    er forms the basic food for 35% of the world’s population. Wheot    1,000 years ago    Today. There are over 30    ories of wheat which    ore grownThe emmer    and einkom    cre among    the oldest. Like several    other cereals, wheat is    also a kind ol gross Spring    wheat is planted in spring    and harvested in the    following summer. The    wheat plant grows to a    height of 0.6 m to 1.5 m. The young wheat plants are short and green    and look like ordinary grass. They furn golden as they ripen. There are    stalks called tillers which branch from the main stem. Wrapped around    them is the base or sheath of the    leaves. The flat top of the leaf is called    the blade. The head of the corn where    the seeds or grains grow is known as    the ear or spike. What we eat is    actually the seeds core, ground into    flour which is used to make bread,    pasta and many other things.   

HOW DO LEAVES CHANGE THEIR COLOURS?     

  All leaves are green in colour. But in autumn, some leaves change their    colours to yellow, orange or bright red. The green colour in leaves is due    to the chlorophyll present in it. Other colours are also present in a leal    but we cannot normally    see them. In summer, the    leaves appear green    because the chlorophyll    present in it makes food    As the weather starts    getting colder, the food    that has been stored in    the leaf begins to flow    out to the branches and    trunks. In winter, the    plant does not make any food. Hence, the chlorophyll disappears and    other pigments which are present become visible. The yellow colour of    the leaf is due to the pigment    xanthopyll, the orange is due to the    pigment carotin and the bright red    colour is due to anthocyanin. Hence,    we are able to see all these beautiful    colours.