{"id":24529,"date":"2021-06-18T15:13:44","date_gmt":"2021-06-18T09:43:44","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=24529"},"modified":"2022-03-02T10:38:17","modified_gmt":"2022-03-02T05:08:17","slug":"ncert-solutions-for-class-7-science-chapter-17","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-17\/","title":{"rendered":"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline"},"content":{"rendered":"<p>These <a href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science\/\">NCERT Solutions for Class 7 Science<\/a> Chapter 17 Forests: Our Lifeline Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams.<\/p>\n<h2>Forests: Our Lifeline NCERT Solutions for Class 7 Science Chapter 17<\/h2>\n<h3>Class 7 Science Chapter 17 Forests: Our Lifeline Textbook Exercise Questions and Answers<\/h3>\n<p>Question 1.<br \/>\nExplain how animals dwelling in the forest help it grow and regenerate.<br \/>\nAnswer:<br \/>\nAnimals which live in the forest help it grow and regenerate in following ways:<\/p>\n<ul>\n<li>By eating vegetation, they clear the land for fresh growth.<\/li>\n<li>Animals help flowering plants in pollination and seed dispersal.<\/li>\n<li>Dead remains of animals make humus after decomposition. This increases soil fertility.<\/li>\n<\/ul>\n<p>Question 2.<br \/>\nExplain how forests prevent floods.<br \/>\nAnswer:<br \/>\nForest acts as a natural absorber of rainwater and allows it to seep underground. It helps in controlling the flow of water and slows it down which helps in preventing floods. Also, the trees present in the forest prevents the rain from directly hitting the ground and bind the soil together which helps in absorption of the rainwater and thus prevent flood.<\/p>\n<p>Question 3.<br \/>\nWhat are decomposers? Name any two of them. What do they do in the forest?<br \/>\nAnswer:<br \/>\nThe organisms which decompose the dead remains of plants and animals are called decomposers. Fungi and bacteria are examples of decomposers. They clear the debris of dead remains and convert them into humus which enriches the topsoil.<\/p>\n<p>Question 4.<br \/>\nExplain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.<br \/>\nAnswer:<br \/>\nForests are called the green lungs. This is because plants in forests release oxygen through the process of photosynthesis and help in providing oxygen to animals for respiration. Plants consume carbon dioxide released by the animals. In this way, plants help in maintaining a balance of oxygen and carbon dioxide in the atmosphere.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-24530\" src=\"https:\/\/i2.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-1.png?resize=356%2C287&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests Our Lifeline 1\" width=\"356\" height=\"287\" srcset=\"https:\/\/i2.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-1.png?w=356&amp;ssl=1 356w, https:\/\/i2.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-1.png?resize=300%2C242&amp;ssl=1 300w\" sizes=\"(max-width: 356px) 100vw, 356px\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 5.<br \/>\nExplain why there is no waste in a forest.<br \/>\nAnswer:<br \/>\nForest works like a self sustaining system. Whatever is produced in the forest is utilised by different components of the forest. Even the waste is converted into beneficial substances in a forest. Due to this, there is no waste in a forest.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 6.<br \/>\nList five products we get from forests.<br \/>\nAnswer:<\/p>\n<ul>\n<li>We get medicines from forests.<\/li>\n<li>We get gum from forests.<\/li>\n<li>We get wood which is used for many purposes like making furniture, paper, etc.<\/li>\n<li>We get food for animals from forests.<\/li>\n<li>We get sealing wax from forests.<\/li>\n<\/ul>\n<p>Question 7.<br \/>\nFill in the blanks:<br \/>\na. The insects, butterflies, honeybees and birds help flowering plants in &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;..<br \/>\nb. A forest is a purifier of &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.. and &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;..<br \/>\nc. Herbs form the &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.. layer in the forest.<br \/>\nd. The decaying leaves and animal droppings in a forest enrich the &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;..<br \/>\nAnswer:<br \/>\n(a) pollination,<br \/>\n(b) water and air,<br \/>\n(c) lowest,<br \/>\n(d) topsoil<\/p>\n<p>Question 8.<br \/>\nWhy should we worry about the conditions and issues related to forests far from us?<br \/>\nAnswer:<br \/>\nWe should worry about the conditions and issues related to forests far from us because, more or less, we are dependent on them because of the following reasons:<\/p>\n<ul>\n<li>The amount of carbon dioxide in air will increase if forests will disappear and thus less oxygen will be there in the atmosphere.<\/li>\n<li>There will be more soil erosion and thus increase in floods as soil will not be able to hold water.<\/li>\n<li>Increase in the percentage of carbon dioxide will also leads to global warming.<\/li>\n<li>Deforestation will endanger our life and environment and also there will be no shelter for animals.<\/li>\n<li>There will also be an imbalance in the nature and thus causing climate changes and less rainfall.<\/li>\n<\/ul>\n<p>Question 9.<br \/>\nExplain why there is a need of variety of animals and plants in a forest.<br \/>\nAnswer:<br \/>\nThere is a need of variety of animals and plants in a forest as each of them contribute for maintaining the ecosystem of the forest. They also help forests in regeneration and growth. Herbivores are needed to eat green plants and to provide food for the carnivores and carnivores are needed to eat herbivores and check their population. Also, decomposers are needed to maintain the supply of nutrition to the soil and to the growing plants.<\/p>\n<p>Question 10.<br \/>\nIn fig. 17.15 (NCERT textbook), the artist has forgotten to put the labels and directions on the arrows. Mark the directions on the arrows and label the diagram using the following labels: clouds, rain, atmosphere, carbon dioxide, oxygen, plants, animals, soil, roots, water table.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-24531\" src=\"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-2.png?resize=299%2C375&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests Our Lifeline 2\" width=\"299\" height=\"375\" srcset=\"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-2.png?w=299&amp;ssl=1 299w, https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-2.png?resize=239%2C300&amp;ssl=1 239w\" sizes=\"(max-width: 299px) 100vw, 299px\" data-recalc-dims=\"1\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-24532\" src=\"https:\/\/i2.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-3.png?resize=315%2C388&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests Our Lifeline 3\" width=\"315\" height=\"388\" srcset=\"https:\/\/i2.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-3.png?w=315&amp;ssl=1 315w, https:\/\/i2.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-3.png?resize=244%2C300&amp;ssl=1 244w\" sizes=\"(max-width: 315px) 100vw, 315px\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 11.<br \/>\nWhich of the following is not a forest product?<br \/>\na. Gum<br \/>\nb. Plywood<br \/>\nc. Sealing wax<br \/>\nd. Kerosene<br \/>\nAnswer:<br \/>\nd. Kerosene<\/p>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 12.<br \/>\nWhich of the following statements is not correct?<br \/>\na. Forests protect the soil from erosion.<br \/>\nb. Plants and animals in a forest are not dependent on one another.<br \/>\nc. Forests influence the climate and water cycle.<br \/>\nd. Soil helps forests to grow and regenerate.<br \/>\nAnswer:<br \/>\nb. Plants and animals in a forest are not dependent on one another.<\/p>\n<p>Question 13.<br \/>\nMicro-organisms act upon the dead plants to produce<br \/>\na. sand<br \/>\nb. mushrooms<br \/>\nc. humus<br \/>\nd. wood<br \/>\nAnswer:<br \/>\nc. humus<\/p>\n<p><span style=\"color: #0000ff;\">NCERT Extended Learning Activities and Projects<\/span><\/p>\n<p>Question 1.<br \/>\nThe Department of Environment is to decide whether some portion of a forest in your area could be cleared for a housing complex. Write a letter to the department explaining your point of view as a concerned citizen.<br \/>\nHint:<br \/>\nTo<br \/>\nThe Director<br \/>\nThe Department of Environment<br \/>\nNew Delhi<br \/>\nSubject: Deforestation in &#8230;&#8230;&#8230; area.<br \/>\nSir\/Mam<br \/>\nAs an aware resident of our society, I have come to know that your department has granted the permission to clear some forest area of our residence. I want to draw your attention towards some points, i.e., the after-effects of your decision.<\/p>\n<ul>\n<li>If you cut the forest area, then the wild animals will move towards the residential area, which is very dangerous to people and animals also.<\/li>\n<li>Due to deforestation, the climate will be affected the most. There will be more carbon dioxide and other dangerous gases in the environment.<\/li>\n<li>Loss of trees and other vegetation may cause soil erosion.<\/li>\n<li>Due to deforestation, the people won\u2019t get the fresh air and health problems will increase day by day.<\/li>\n<\/ul>\n<p>These are the points which may cause danger to our lives and environment due to deforestation. 1 request to reconsider your decision in the public interest.<br \/>\nThanking you<br \/>\nYours faithfully<br \/>\nA concerned citizen<\/p>\n<p>Question 2.<br \/>\nVisit a forest. Here is a list of points that would make your visit more fruitful.<br \/>\na. Make sure that you have permission to go into the forest.<br \/>\nb. Make sure that you can find your way around. Get a map and go along with someone who is familiar with the area.<br \/>\nc. Keep a record of the things you see and do. Observations make the visit interesting. Sketches and photographs are useful.<br \/>\nd. You may record bird calls.<br \/>\ne. Collect different kinds of seeds or hard fruits like nuts.<br \/>\nf. Try to recognise various types of trees, shrubs, herbs, etc. Make lists of plants from different places in the forest and of different layers. You may not be able to name all the plants, but it is worth recording and seeing where they grow. Make a record of approximate height of plants, crown shape, bark texture, leaf size and flower colour.<br \/>\ng. Learn to recognise the animal\u2019s droppings.<br \/>\nh. Interview the forest officials and the people of surrounding villages and other visitors.<br \/>\nHint:<br \/>\nDo it yourself.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p><span style=\"color: #0000ff;\">Activity 1<\/span><\/p>\n<p>Objective: To verify the fact that the decaying organic matter is always moist and warm.<br \/>\nMaterials Required: Khurpi, leaves, water, etc.<br \/>\nProcedure:<\/p>\n<ul>\n<li>Dig a small pit with the help of a khurpi.<\/li>\n<li>Fill the vegetable wastes, dry leaves, etc., in this pit and cover it with soil. Pour some water over it.<\/li>\n<li>After 3-4 days, remove the upper layer of soil and observe the decaying matter.<\/li>\n<\/ul>\n<p>Observation: We observe that the decaying matter is moist and warm.<br \/>\nConclusion: The decaying organic matter is always moist and warm.<\/p>\n<p>Forests are Green Lungs: Plants take up carbon dioxide and release oxygen during photosynthesis. The plants keep balance of carbon dioxide and oxygen in the atmosphere. This is a reason why forests are called green lungs of the earth.<\/p>\n<p>Forests as Dynamic Living Entity: By harbouring a greater variety of plants, the forests provide greater opportunities for food and habitat for herbivores. Larger number of herbivores means increased availability of food for a variety of carnivores. The wide variety of animals helps the forest to generate and grow. Decomposers help in maintaining the supply of nutrients to the growing plants in the forest. Therefore, the forest is a called \u2018dynamic living entity\u2019 which means \u2018full of life and vitality\u2019.<\/p>\n<p>Soil Erosion: Washing away of the top fertile layer of soil by water or wind is called soil erosion. Soil helps the forest to grow and regenerate. Forests protect the soil and avoid soil erosion.<\/p>\n<p>Deforestation: Large scale cutting of trees to clear land for human use is called deforestation. Deforestation may lead to floods, global warming, danger to environment and our life.<\/p>\n<p>Afforestation: It refers to the large scale planting of trees. It helps in increasing the forest land and thus helps in improving the environment of the earth. It also leads to several benefits that the forests provide us.<\/p>\n<p>Significance of Forests: Forest plays an important role in preserving environment. Green plants take solar energy and convert it into chemical energy while making food during photosynthesis. Thus, solar energy is transferred to other living beings through the green plants. Green plants utilise carbon dioxide during photosynthesis and release oxygen. That is how the green plants maintain the balance of carbon dioxide and oxygen in the environment. It also protects the soil and increase underground water table. It is a home to a wide variety of fauna.<\/p>\n<h3>Class 7 Science Chapter 17 Forests: Our Lifeline Additional Important Questions and Answers<\/h3>\n<p><span style=\"color: #0000ff;\">Very Short Answer Type Questions<\/span><\/p>\n<p>Question 1.<br \/>\nDefine deforestation.<br \/>\nAnswer:<br \/>\nCutting and destroying of the forest is called deforestation.<\/p>\n<p>Question 2.<br \/>\nWhat is meant by afforestation?<br \/>\nAnswer:<br \/>\nPlanting more and more trees by which we can preserve our forest wealth is called afforestation.<\/p>\n<p>Question 3.<br \/>\nWhat are producers?<br \/>\nAnswer:<br \/>\nGreen plants are called producers.<\/p>\n<p>Question 4.<br \/>\nWhat are herbivores?<br \/>\nAnswer:<br \/>\nThe organisms which directly depend on plants for their food are called herbivores.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 5.<br \/>\nWhat are carnivores?<br \/>\nAnswer:<br \/>\nThe organisms which are flesh-eaters and depend on other animals for their food are called carnivores.<\/p>\n<p>Question 6.<br \/>\nDraw any simple food chain going on in the forests?<br \/>\nAnswer:<br \/>\nGrass \u2192 Insects \u2192 Frogs \u2192 Snake \u2192 Eagle<\/p>\n<p>Question 7.<br \/>\nWhat happens if an animal dies in the forest?<br \/>\nAnswer:<br \/>\nDead animals become food for vultures, crows, jackals and insects.<\/p>\n<p>Question 8.<br \/>\nWhat is known as the crown of the tree?<br \/>\nAnswer:<br \/>\nBranchy part of a tree above the stem is known as the crown of the tree.<\/p>\n<p>Question 9.<br \/>\nWhat is canopy?<br \/>\nAnswer:<br \/>\nBranches of the tall trees look like a roof over the other plants in the forest. This is called a canopy.<\/p>\n<p>Question 10.<br \/>\nWhat is humus?<br \/>\nAnswer:<br \/>\nHumus is a dark-coloured substance which is formed from the decomposition of dead bodies of plants and animals.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 11.<br \/>\nWhat are known as understroyes in a forest?<br \/>\nAnswer:<br \/>\nTrees have crowns of different types and sizes. These create different horizontal layers in the forest. These are known as understroyes.<\/p>\n<p>Question 12.<br \/>\nWhat is the effect of deforestation on soil?<br \/>\nAnswer:<br \/>\nRoots of trees normally bind the soil together, but in their absence, the soil is washed away or eroded.<\/p>\n<p>Question 13.<br \/>\nIn which layer of the soil would you find humus? What is its importance to the soil?<br \/>\nAnswer:<br \/>\nHumus is found in the top, organic layer of soil. Humus provides many useful nutrients to the soil.<\/p>\n<p>Question 14.<br \/>\nWould you see similar kinds of trees and animals in every forest?<br \/>\nAnswer:<br \/>\nNo, we don\u2019t see similar kinds of trees and animals in every forest.<\/p>\n<p>Question 15.<br \/>\nWhat do you mean by food chain?<br \/>\nAnswer:<br \/>\nThe organisms which take their food from plants get eaten by other organisms and so on. This chain of eating and being eaten is called food chain.<\/p>\n<p>Question 16.<br \/>\nName some factors responsible for clearing of forests.<br \/>\nAnswer:<br \/>\nConstruction of roads and buildings, industrial development, increasing demands of wood, etc.<\/p>\n<p>Question 17.<br \/>\nWhat role does a decomposer play in forest?<br \/>\nAnswer:<br \/>\nDecomposers convert dead leaves and dead animals into humus.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 18.<br \/>\nHow will water pollution be affected with the depletion of forests?<br \/>\nAnswer:<br \/>\nWithout trees, there will be no roots holding the soil in a forest. Soil will run into the river and will cause water pollution.<\/p>\n<p>Question 19.<br \/>\nHow do animals help forest to grow?<br \/>\nAnswer:<br \/>\nThe animals disperse the seeds of certain plants and help the forest to grow and regenerate.<\/p>\n<p>Question 20.<br \/>\nHow can we recognise the presence of an animal in the forest?<br \/>\nAnswer:<br \/>\nBy its droppings and footprints, we can recognise the presence of an animal in the forest.<\/p>\n<p><span style=\"color: #0000ff;\">Short Answer Type Questions<\/span><\/p>\n<p>Question 1.<br \/>\nWhy does the forest floor seem to be dark-coloured?<br \/>\nAnswer:<br \/>\nThe forest floor seems to be dark-coloured as it is covered with a layer of dead and decaying leaves, fruits, seeds, twigs and small herbs. The decaying matter is moist and warm.<\/p>\n<p>Question 2.<br \/>\nHow are the trees planted in a forest?<br \/>\nAnswer:<br \/>\nIn nature, trees produce enough seeds. The forest floor provides favourable conditions for them to germinate and develop into seedlings and saplings. Some grow up into trees.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 3.<br \/>\nWhy even after heavy rainfall, water does not stagnate in the forest?<br \/>\nAnswer:<br \/>\nForest acts as a natural absorber of rainwater and allows it to seep. It helps maintain the water table throughout the year. Forests not only help in controlling floods but also help maintain the flow of water in the streams so that we get a steady supply of water.<\/p>\n<p>Question 4.<br \/>\nWhy are forests called the green lungs?<br \/>\nAnswer:<br \/>\nPlants release oxygen through the process of photosynthesis. The plants help to provide oxygen for animal respiration. They also maintain the balance of oxygen and carbon dioxide in the atmosphere. That is why forests are called the green lungs.<\/p>\n<p>Question 5.<br \/>\nWhy raindrops do not hit the forest floor directly?<br \/>\nAnswer:<br \/>\nThe uppermost layer of the forest canopy intercept the flow of raindrops and most of the water come down through the branches and the stems of the trees. From the leaves it drips slowly over branches of the shrubs and herbs. Thus, raindrops do not hit the forest floor directly.<\/p>\n<p>Question 6.<br \/>\nWhy are forests disappearing?<br \/>\nAnswer:<br \/>\nForests are disappearing due to:<\/p>\n<ul>\n<li>construction of roads, buildings, industrial development and increasing demand of wood.<\/li>\n<li>overgrazing of animals and indiscriminate felling of trees for agricultural land.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 7.<br \/>\nExplain the importance of forests.<br \/>\nAnswer:<br \/>\nForests are very important to us. They provide us with oxygen. They protect soil and provide habitat to a large number of animals. They help in bringing good rainfall in neighbouring areas. They are a source of medicinal plants, timber and many other useful products.<\/p>\n<p>Question 8.<br \/>\nExplain how forest affects food chain.<br \/>\nAnswer:<br \/>\nAll animals, whether herbivores or carnivores, depend ultimately on plants for food. Organisms which feed on plants often get eaten by other organisms, and so on. For example, grass is eaten by insects, which in turn, is taken by the frog. The frog is consumed by snakes. This is said to form a food chain: Grass \u2192 insects \u2192 frog \u2192 snake \u2192 eagle. Many food chains can be found in the forest. All food chains are linked. If any one food chain is disturbed, it affects other food chains. Every part of the forest is dependent on the other parts.<\/p>\n<p>Question 9.<br \/>\nDefine deforestation. Write its causes and consequences also.<br \/>\nAnswer:<br \/>\nThe excessive cutting of forests and trees is called deforestation.<br \/>\nCauses of deforestation:<\/p>\n<ul>\n<li>Trees are used for charcoal, fuel, timber, etc.<\/li>\n<li>The cleared land is used as pasture for livestock, plantations of commodities, and settlements.<\/li>\n<\/ul>\n<p>Consequences of deforestation:<\/p>\n<ul>\n<li>The removal of trees resulted in damage to habitat, biodiversity loss and aridity.<\/li>\n<li>It has adverse impacts on bio-sequestration of atmospheric carbon dioxide.<\/li>\n<li>Deforested regions may degrade into wasteland due to soil erosion.<\/li>\n<\/ul>\n<p>Question 10.<br \/>\nHow do forests maintain the water cycle?<br \/>\nAnswer:<br \/>\nThe role of rainforests in the water cycle is to add water to the atmosphere through the process of transpiration (in which plants release water from their leaves during photosynthesis). This moisture contributes to the formation of rain clouds which release the water back onto the rainforests. This maintains the water cycle and water level in the environment.<\/p>\n<p>Question 11.<br \/>\nHow are the nutrients of the soil\u2019 related to decomposers?<br \/>\nAnswer:<br \/>\nDifferent animals and plants live in forests. When they die, nobody cremates their dead bodies. They keep on lying there. Scavengers like vultures, eagle, etc., eat their dead bodies. They eat flesh and other soft organs. The rest of the dead bodies are broken down by various microorganisms called decomposers. They decompose the dead bodies of plants and animals into a dark substance called humus which maintains the nutrient level of the soil.<\/p>\n<p><span style=\"color: #0000ff;\">Long Answer Type Questions<\/span><\/p>\n<p>Question 1.<br \/>\nExplain why forest is called \u201cthe dynamic living entity\u201d?<br \/>\nAnswer:<br \/>\nThe wide variety of animals helps the forest to regenerate and grow. In forest, plants produce food. All animals, whether herbivores or carnivores, depend ultimately on plants for food. Organisms which feed on plants often get eaten by other organisms, and so on. This is said to form a food chain.<\/p>\n<p>Decomposers feed upon the dead plant and animal tissues and convert them into a dark coloured substance called humus. By harbouring greater variety of plants, the forest provides good opportunities for food and habitat for the herbivores. Larger number of herbivores means increased availability of food for a variety of carnivores. Thus forest is the dynamic living entity, that is, full of life and vitality.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 2.<br \/>\nWhat would happen if forests disappear?<br \/>\nAnswer:<br \/>\nThe conditions and issues we have to face when forests disappear are:<\/p>\n<ul>\n<li>Soil erosion: Trees in a forest hold the soil with their roots. If trees are gone, soil will be washed away.<\/li>\n<li>Landslides: Without trees, land will be very unstable and easily move down the slope.<\/li>\n<li>Water pollution: Without tree roots holding the soil in a forest, soil will run into the river by flowing water and wind.<\/li>\n<li>Loss of biodiversity: Plants and animals will lose their food and shelter.<\/li>\n<li>Floods: Bald hills and mountains can no longer hold back sudden flows of water, which may cause floods.<\/li>\n<li>Increase in carbon dioxide: Depletion of forests results in increase in carbon dioxide which will cause global warming.<\/li>\n<\/ul>\n<p>Question 3.<br \/>\nWhy is replenishment of forests necessary?<br \/>\nAnswer:<br \/>\nForests need to be replenished because of the following reasons:<\/p>\n<ul>\n<li>Rainfall: During transpiration, trees give out enormous amount of water vapour. This water vapour helps in the formation of rain clouds. So, if trees are cut and not replenished, the rainfall in the area will reduce.<\/li>\n<li>Natural rate of tree growth: Forests cannot be regrown in a few days or months as trees take many years to grow fully. Thus, it becomes necessary to replenish the forests periodically.<\/li>\n<li>Soil erosion: If a large number of trees are cut, the soil becomes naked. The topsoil, which is rich in organic matter will be washed away by water or carried away by wind. Trees help in binding the soil.<\/li>\n<li>Carbon dioxide-oxygen balance: Forests have a very large number of trees which give out O<sub>2<\/sub> and take in CO<sub>2<\/sub> by photosynthesis. In this way, they help in maintaining the carbon dioxide-oxygen balance in the atmosphere.<\/li>\n<li>Timber and fuel: Forests are the best suppliers of timber for furniture and fuel. So, for their constant supply, forests need to be replenished.<\/li>\n<\/ul>\n<p>Question 4.<br \/>\nWhat are the various steps, we can take to conserve our forests?<br \/>\nAnswer:<\/p>\n<ul>\n<li>We should mindfully celebrate the Van Mahotsav Day.<\/li>\n<li>We should lay emphasis on tree plantation.<\/li>\n<li>We should discourage the use of wooden furniture.<\/li>\n<li>We should impose strict environmental laws.<\/li>\n<li>Educating and sensitising people regarding the role of forests in maintaining stable ecosystem should be done.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/01\/NCERT-Solutions-Guru.png?resize=170%2C17&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" width=\"170\" height=\"17\" data-recalc-dims=\"1\" \/><\/p>\n<p><span style=\"color: #0000ff;\">Picture-Based Questions<\/span><\/p>\n<p>Question 1.<br \/>\nDraw a diagram of different types of crowns of trees.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-24533\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-4.png?resize=357%2C219&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests Our Lifeline 4\" width=\"357\" height=\"219\" srcset=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-4.png?w=357&amp;ssl=1 357w, https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-4.png?resize=300%2C184&amp;ssl=1 300w\" sizes=\"(max-width: 357px) 100vw, 357px\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 2.<br \/>\nDraw a diagram to show canopy and understorey.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-24534\" src=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-5.png?resize=437%2C278&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests Our Lifeline 5\" width=\"437\" height=\"278\" srcset=\"https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-5.png?w=437&amp;ssl=1 437w, https:\/\/i0.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-5.png?resize=300%2C191&amp;ssl=1 300w\" sizes=\"(max-width: 437px) 100vw, 437px\" data-recalc-dims=\"1\" \/><\/p>\n<p>Question 3.<br \/>\nObserve the following figure and label its various components.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-24535\" src=\"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-6.png?resize=422%2C311&#038;ssl=1\" alt=\"NCERT Solutions for Class 7 Science Chapter 17 Forests Our Lifeline 6\" width=\"422\" height=\"311\" srcset=\"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-6.png?w=422&amp;ssl=1 422w, https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2021\/06\/NCERT-Solutions-for-Class-7-Science-Chapter-17-Forests-Our-Lifeline-6.png?resize=300%2C221&amp;ssl=1 300w\" sizes=\"(max-width: 422px) 100vw, 422px\" data-recalc-dims=\"1\" \/><br \/>\nAnswer:<br \/>\n1. Carbon dioxide<br \/>\n2. Oxygen<br \/>\n3. Photosynthesis<br \/>\n4. Nutrients<br \/>\n5. Decomposers<br \/>\n6. Soil<br \/>\n7. Water<\/p>\n<h4><strong>NCERT Solutions for Class 7 Science<\/strong><\/h4>\n<ul>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-1\/\">Class 7 Science Chapter 1 Nutrition in Plants<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-2\/\">Class 7 Science Chapter 2 Nutrition in Animals<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-3\/\">Class 7 Science Chapter 3 Fibre to Fabric<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 4 Heat\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-4\/\">Class 7 Science Chapter 4 Heat<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 5 Acids, Bases and Salts\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-5\/\">Class 7 Science Chapter 5 Acids, Bases and Salts<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-6\/\">Class 7 Science Chapter 6 Physical and Chemical Changes<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 7 Weather, Climate and Adaptations of Animals of Climate\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-7\/\">Class 7 Science Chapter 7 Weather, Climate and Adaptations of Animals of Climate<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 8 Winds, Storms and Cyclones\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-8\/\">Class 7 Science Chapter 8 Winds, Storms and Cyclones<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 9 Soil\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-9\/\">Class 7 Science Chapter 9 Soil<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-10\/\">Class 7 Science Chapter 10 Respiration in Organisms<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 11 Transportation in Animals and Plants\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-11\/\">Class 7 Science Chapter 11 Transportation in Animals and Plants<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-12\/\">Class 7 Science Chapter 12 Reproduction in Plants<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 13 Motion and Time\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-13\/\">Class 7 Science Chapter 13 Motion and Time<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 14 Electric Current and its Effects\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-14\/\">Class 7 Science Chapter 14 Electric Current and its Effects<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 15 Light\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-15\/\">Class 7 Science Chapter 15 Light<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 16 Water: A Precious Resource\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-16\/\">Class 7 Science Chapter 16 Water: A Precious Resource<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-17\/\">Class 7 Science Chapter 17 Forests: Our Lifeline<\/a><\/li>\n<li><a title=\"NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-18\/\">Class 7 Science Chapter 18 Wastewater Story<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>These NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams. Forests: Our Lifeline NCERT Solutions for Class 7 Science Chapter 17 Class 7 Science Chapter 17 Forests: Our Lifeline Textbook Exercise Questions and Answers &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-17\/\"> <span class=\"screen-reader-text\">NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[9],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline - MCQ Questions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-7-science-chapter-17\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline - MCQ Questions\" \/>\n<meta property=\"og:description\" content=\"These NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams. 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