The different layers of vegetation present in a forest provide food and shelters to animals, birds and insects. 1. Since the green plants and trees of the forest supply oxygen for breathing and respiration, therefore, forests are known as green lungs. plants and trees of the forest absorb carbon dioxide from, the atmosphere for the process of food making (called, photosynthesis). Answers: 1. Tribals depend on forests for their livelihood. Forest class 7 1. can ultimately become a desert having no vegetation at all. By holding back rainwater and then releasing it slowly into rivers, the forests prevent the occurrence of floods in the rivers. Loss of different species of animals and plants. (1) Wood is used as a fuel wood (or firewood) in many households as a source of heat for cooking food. So, due to the presence of tree cover (canopy) and many layers of vegetation, the rain does not hit the forest floor of trees and many layers of vegetation in the forest softens the effect of heavy rains on the soil due to which the soil does not become loose and hence soil erosion is prevented. Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 1 Comment. The rainwater falling in a forest first hits the cover of trees (canopy) and then the various other layers of vegetation below the canopy, and gets slowed down. Forests play an important role in the purification of the atmospheric air. 1. If the forests are cut down, then in the absence of trees and plants of the forest, the excessive amount of rainwater falling during heavy rains cannot be absorbed into forest ground. The large amount of rainwater will then suddenly flow into rivers causing the flooding of rivers. 17.3). The cutting down of forests (or deforestation) is driving out many populations of people who, have been living in forests for centuries. ), and small vegetation due to which it behaves like a giant sponge, and absorbs most of the rainwater which falls down during heavy rains. There are several other trees, shrubs, herbs, cree… The trees in the forests absorb the carbon emission from the neighbouring urban centres, refreshing and returning fr… … Forests are a very important natural resource provided to us. Thus, all the needs of animals living in a forest are fulfilled. Question 1 Explain how forest prevents soil erosion? The carnivorous animals hunt and eat herbivorous animals as food. In this way, the forests not only help in controlling floods, they also help in maintaining the flow of water in the rivers throughout the year. Thus, forests remove carbon dioxide from the atmosphere and put oxygen into the atmosphere by doing this, forests maintain the balance of carbon dioxide and oxygen in the atmosphere. The forest provides leaves, flowers, fruits, seeds, nuts and bark of trees, as food for the various herbivorous animals. Forests include non-living things like air, water, nutrients, rocks and sunlight. English Alphabets with Phonics Pronunciation, Economics Chapter 2 Sectors of the Indian Economy – Notes & Study Material, Economics Chapter 1 Development – Notes & Study Material, Geography Chapter 6 Manufacturing Industries – Notes & Study Material. There are a large number of various types of animals and birds in the forests. People become homeless when such disaster occurs. It also involves the reversal of deforestation and environmental pollution. Boojho and Paheli remembered that they have studied about forests as Fig. Question 7 Explain how forest keep the climate cool? Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7.. The process of burning of fuels in homes, transport and industry also releases carbon dioxide into the atmosphere. Thus, cutting down of increasing, number of forest trees (or deforestation) leads to sudden floods in rivers which cause a great loss of life and, Forests Provide Food and Shelter to Wild Animals and Birds. The dense bushes, tall grasses and thick trees provide the forest animals with shelter, and. The forest provides leaves, flowers, fruits, seeds, nuts and bark of trees, as food for the various herbivorous animals. Thus, cutting down of increasing number of forest trees (or deforestation) leads to sudden floods in rivers which cause a great loss of life and property in the nearby areas. Tropical evergreen forest 2. Science - Class 7 /Grade 7 (Chapter 11-18) Chapter 17 – Forests: Our Lifeline - 1 NCERT Solutions for Class 7 Science PDF free download, NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline, to Study online or download free in PDF form. NCERT Solutions for Class 7 Science CBSE, 17 Forests: Our Lifeline. 6 Forests Prevent Soil Erosion; 7 Forests Prevent Occurrence of Floods; 8 Forests Provide Food and Shelter to Wild Animals and Birds; 9 Forests Provide Food and Shelter to Forest-Dwelling … 8.3 How many people are employed in forestry? In this way, the forests not only help in controlling floods, they also help. (3) The paper used for printing newspapers, magazines and books, and for making notebooks is made from wood. Question 6 Explain how forests help in maintaining Water Cycle in Nature? High levels of carbon dioxide in the atmosphere can absorb too much of sun’s heat rays lead to global warming. Available for CBSE, ICSE and State Board syllabus. This will help them to identify their weak areas and will help them to also protect the herbivorous animals from carnivorous animals in the forest. It is also leading to the loss of traditionally harvested forest products such as firewood, fruits, honey, sealing wax (lac), gum, catechu, herbs, and fodder which supplied tribal people with their needs. Forest provides homae (shelter), food and water to the animals living there. Class-7CBSE Board - Importance of Forest - LearnNext offers animated video lessons with neatly explained examples, Study Material, FREE NCERT Solutions, Exercises and Tests. What is the role of forest in maintaining the balance between Oxygen and Carbon dioxide in nature? Thus, forests remove carbon dioxide from the atmosphere and put oxygen into the atmosphere. More of. This increasing amount of carbon dioxide in the atmosphere is absorbing more and more of sun’s heat rays leading to global warming. sun’s rays then reach the surface of earth due to which the climate will become warmer. So, forests are the major suppliers of oxygen needed by humans and other animals for breathing and respiration. in maintaining the flow of water in the rivers throughout the year. It is very important for every country to have 30% land covered by forests. tropical deciduous forest 3. In this way, the plants reduce the amount of carbon dioxide in the atmosphere. In the absence of forests, the wild animals and birds do not get food and shelter. There are a large number of various types of animals and birds in the forests. Get a free home demo of LearnNext . Deforestation has many ill-effects on the environment. (a) Tall Trees (b) Shrubs (c) Herbs (d) None of these All the chapter wise questions with solutions to help you to revise the complete CBSE syllabus and score more marks in Your board examinations. Pollination is carried out with the help of animals which helps in growth and reproduction of variety of plants. The removal of fertile top soil from a region by wind, rain or river water is called soil erosion. 1. Forests Provide Food and Shelter to Forest-Dwelling People, Many tribal people of our country live in forests. Wood pulp is used in manufacturing paper. 'Give answer for two marks question? Since, there is no tree cover to soften the effect of fast falling rainwater, the bare soil becomes loose quickly by the force of falling, rainwater, and hence carried away easily by the rainwater flowing, can remove the fertile top soil from land and leave the ground, unsuitable for growing crops. This process is repeated and the area which was once a thick forest. the process of food making (called photosynthesis). These categories occupy different levels in the food chain. and other animals for breathing and respiration. (iii) Forest are cut down to obtain wood for making paper. The soil carried away by rainwater during soil erosion usually deposits on the river beds. So, they either die or get killed .Thus, cutting down of forests leads to the loss of many species of animals and birds.Some wild animals and birds are becoming extinct (disappearing completely) due to the destruction of forests. Destruction of trees in the forest area and converting large area of land as a habitat for human beings is called as deforestation. Explain how animals dwelling in the forest help it grow and regenerate. Register online for Science tuition on Vedantu.com to score more marks in your examination. Forests make a strong net of tree roots to hold the soil from being washed away. This is very important because carbon dioxide is a greenhouse gas which, absorbs heat rays. The cutting down of forest trees (or deforestation) leads to a decrease, when there are lesser number of trees in the forest, less water is given off as water vapour to the, atmosphere through transpiration due to which less rainfall occurs, And because of lesser rainfall less, number of new trees grow in the forest. Download free printable assignments worksheets of Science from CBSE NCERT KVS schools, free pdf of CBSE Class 7 Science Forest Assignment chapter wise important exam questions and answers CBSE Class 7 Science -Forest. Due to this binding of soil particles, the strong winds and flowing rainwater are not able to carry away the top soil, The rainwater falling in a forest first hits the cover of trees, (canopy) and then the various other layers of vegetation below the canopy, and gets slowed down. So, forests are the major suppliers of oxygen needed by humans. The, process of burning of fuels in homes, transport and industry. Required fields are marked *, The various things which are obtained from the forests are called. Due to this binding of soil particles, the strong winds and flowing rainwater are not able to carry away the top soil and hence the soil erosion is prevented. The cutting down of forests (or deforestation) is driving out many populations of people who have been living in forests for centuries. (ii) Forests are cut down to obtain timber. Filed Under: Class 7, Forests Our Lifeline, Science. Class 7 Science – Importance of Forest – Our Lifeline • It is the large area of land thickly covered with plants, trees, bushes etc. Q9: Which forms the lowest layer in a forest? ), doors and windows of houses and other buildings, plywood, boxes, ships, matchsticks, paper, and many other things. The dense bushes, tall grasses and thick trees provide the forest animals with shelter, and also protect the herbivorous animals from carnivorous animals in the forest. Increase of carbon dioxide levels in the atmosphere due to the absence of trees for absorbing this gas. A forest is a large area of land covered mainly with trees, and other plants.Due to different climates and soils, there are variations in the types of trees and other plants found in various forests. CBSE Class 7 Science Forests: Our Lifeline. So, they either die or get killed .Thus, cutting down of forests leads to the loss of many species of animals and birds.Some wild animals. This video is highly rated by Class 7 students and has been viewed 1162 times. The trees and other plants that form a part of the forests create an environment that is healthy for the breeding several species of animals. Forests help in energy transfer and maintain food chains. The human beings and other animals give out carbon dioxide during respiration which goes into atmosphere. (b) Interconnected network of food chain forms a food web. Significance of forests Forests serve different purposes. Carbon dioxide is considered to be a greenhouse gas. In fact, the excessive cutting down of forest trees (or deforestation) these days, is increasing the amount of carbon dioxide in the atmosphere gradually. The captured water is gradually released in the cities and towns downstream. The Increase of the population of our country has led to the shrinking of forest cover. Q8: Which of the following is NOT TRUE about forests? What are the 2 ways to control the amount of carbon dioxide in the atmosphere. In this way, forests help in maintaining a perfect water cycle in nature and meet our freshwater requirements. Some of the common trees found in the forests in our country are: Sal, Teak, Sheesham, Neem, Palash, Semal, Bamboo, Fig, Khair, Eucalyptus, Kikar, Arjuna, Banyan and Peepal. The roots of trees and plants in the forest help this rainwater to seep into the forest, ground and raise the water table. (2) Wood is also used for making a large number of various types of wooden items such as furniture (table, chair, sofa, etc. CLASS :- VII SUBJECT :- CHEMISTRY MADE BY :- RAVI PRAKASH SINGH Monday, December 11, 2017 RAVI PRAKASH SINGH 1 CHAPTER – 15 FOREST 2. Forests make up the biggest part of the ecosystem to support the wildlife that is, the birds, animals and insects of different varieties. (d) Forests are green lungs. ), and small, vegetation due to which it behaves like a giant sponge, and absorbs most of the rainwater which falls down, during heavy rains. earth. Students are advised to refer to the attached assignments and practice them regularly. Soil erosion can remove the fertile top soil from land and leave the ground unsuitable for growing crops. The clouds which form from the water vapour going into the atmosphere through transpiration from. Forests provide the people living in it with. They could see now how the forest provides a home for many animals and plants. Forests are valuable resources. Forests and Living Beings What is the importance of Forests and how different components of forests are interdependent upon each other? Destruction of trees in the forest area and converting large area of land as a habitat for human beings is called as deforestation. thank you mam, Study all and much more in this topic. Natural calamities like floods, cyclones, hail forms are more in the absence of trees and forest. Describe the role of forests in maintaining the balance between carbon dioxide and oxygen in the atmosphere. The cutting down of forests (or deforestation) leads to soil erosion. A forest is known as an intricate ecosystem that is densely covered with trees, shrubs, grasses and mosses. Many tribal people of our country live in forests. Question 2 Explain how forest prevent floods? Answer: Forest acts as a natural absorber of rainwater and … This water vapour helps in the formation of clouds and bring rain on the earth. Some of the forest trees are also covered with different types of creepers and climbers. Explain. Food chains are disturbed due to their loss. Forests form an important … High levels of carbon dioxide in the atmosphere can absorb too much of sun’s heat rays, lead to global warming. So, due, and many layers of vegetation, the rain does not hit the forest floor, of trees and many layers of vegetation in the forest softens the effect of heavy rains, on the soil due to which the soil does not become loose and, plants, there are no roots which can bind the soil particles, together and prevent them from being carried away by strong, winds or heavy rains. The level of employment in forestry … It is a system that comprises of plants,... • The various component of the forest is interdependent on one another. Q2: Explain how forests prevent floods. Question 3 What is the role of forest in maintaining the balance between carbon dioxide and oxygen in the atmosphere? If the forests are cut down, then in the absence of trees and plants of the forest, the excessive amount, of rainwater falling during heavy rains cannot be absorbed into forest ground. We hope the given CBSE Class 7 Science Notes Chapter 17 Forests: Our Lifeline Pdf free download will help you. This is because when there are lesser number of trees in the forest, less water is given off as water vapour to the atmosphere through transpiration due to which less rainfall occurs, And because of lesser rainfall less number of new trees grow in the forest. (c) Animals excreta pollute forest soil. Forests control global warming.give reasons.? Since there is no tree cover to soften the effect of fast falling rainwater the bare soil becomes loose quickly by the force of falling rainwater, and hence carried away easily by the rainwater flowing on the ground . Its increased level in the atmosphere results in greenhouse effect thereby causing global warming. The green plants and trees of the forest absorb carbon dioxide from the atmosphere for the process of food making (called photosynthesis). When the forest trees are cut down, then the cloud cover in the area is reduced. (a) Dead and decaying matter enrich the soil of the forest. Loss of forest products provide by plants and animals living in the forests. by doing this, forests maintain the balance of carbon dioxide and oxygen in the atmosphere. green plants and trees of the forest supply oxygen for, breathing and respiration, therefore, forests are known as g, reen lungs. Save Trees Essay for Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12. 17.2 Some forest animals Fig. The various things which are obtained from the forests are called forest products.Some of the important products which we get from the forests are Wood, Honey, Gum, Sealing wax (or Lac), Catechu (Kattha), Fruits, Oils, Spices, Natural rubber, Cork, Dyes, Medicinal plants and Fodder for cattle. Forests are of great importance to mankind. So, there is necessity to think and set to conserve forests. The carnivorous animals hunt and eat herbivorous animals as food. Forest conservation as the name suggests is the preservation and the protection of forests. by your text i have compeleted my project work, Your email address will not be published. In the absence of trees and plants, there are no roots which can bind the soil particles together and prevent them from being carried away by strong winds or heavy rains. More of sun’s rays then reach the surface of earth due to which the climate will become warmer. It is also leading to the loss of traditionally harvested forest, products such as firewood, fruits, honey, sealing wax (lac), gum, catechu, herbs, and fodder which. The cutting down of forests (or deforestation) leads to the destruction of natural habitat of wild animals and birds. Important Forest Produce: Many important forest produce are useful for us. These are thus a habitat for a large variety of wild animals and birds. A forest is defined as an area forming an ecosystem. of forests, the wild animals and birds do not get food and shelter. The preservation of allnatural resourcesis absolutely essential for the balance of our ecosystem. The roots of trees and plants growing in the forest bind the particles of top soil and hold the soil together firmly. The cutting down of forest trees (or deforestation) leads to a decrease in rainfall. Not only this, forests form a complete ecosystem that includes various living organisms such as trees, shrubs, plants, microorganisms, wild animals and birds. The people who live in forests depend mostly on the forests for all their needs. Forests and tribals: Purifies the Air. Nutrition in Plants Nutrition in Animals Fibre to Fabric Heat ... Q13: The micro-organisms called decomposers play an important role in the forest. Some examples are given below: Firewood and dry leaves are used as kitchen fuel in villages which are close to a forest. 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