NCERT Solutions for Class 7 Science Chapter 12 Forests: Our Lifeline
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Book Name: Science
Subject: Science
Chapter Number: 17
Chapter Name: Forests Our Lifeline
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Book Name: Science
Subject: Science
Chapter Number: 17
Chapter Name: Forests Our Lifeline
You can also bookmark this page by clicking + Save to Library icon and refer to these NCERT Solutions anytime from your account. More Detail
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Page 1
NCERT
SOLUTIONS
CLASS - 7TH
aglase .co
SOLUTIONS
CLASS - 7TH
aglase .co
Page 2
Book : Science Ncert Solutions | Chapter-17 Science
Class : 7th
Subject : Science
Chapter : 17
Chapter Name : Forests: Our Lifeline
Q1 Explain how animals dwelling in the forest help it grow and regenerate.
Answer. The animals in forests are of various types. These could be herbivores,carnivores,
micro-organisms, etc. These play an important role in maintaining the food chains.
(i) Micro-organisms convert the dead plants and animals to humus. This humus helps in
returning the nutrients back to the soil. These are absorbed by plants.
(ii) The animals also help in dispersing the seeds of certain plants.
(iii) The decaying animal dung provides nutrients to various types of seedlings to grow.
All these activities of animals dwelling in the forest help it to grow and regenerate.
Q2 Explain how forests prevent oods.
Answer. Forest acts as a natural absorber of water. It allows rainwater to seep through. In the
absence of trees, the rain water would hit the ground directly resulting in ood. However,
because of the presence of trees, rain water does not hit the ground directly. It rather hits the
ground slowly. Hence, before ooding, all the rain water seeps through ground. In this way,
forests prevent oods.
Q3 What are decomposers? Name any two of them. What do they do in the forest?
Answer. Decomposers are micro-organisms that convert the dead plants and animals to
humus. Bacteria and fungi are the two types of decomposers. They help in the process of
recycling of nutrients by decomposing various dead organisms such as plants and animals to
form humus.
Q4 Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in
the atmosphere.
Answer. Forests 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.
Page 1 of 4 Aglasem Schools
Class : 7th
Subject : Science
Chapter : 17
Chapter Name : Forests: Our Lifeline
Q1 Explain how animals dwelling in the forest help it grow and regenerate.
Answer. The animals in forests are of various types. These could be herbivores,carnivores,
micro-organisms, etc. These play an important role in maintaining the food chains.
(i) Micro-organisms convert the dead plants and animals to humus. This humus helps in
returning the nutrients back to the soil. These are absorbed by plants.
(ii) The animals also help in dispersing the seeds of certain plants.
(iii) The decaying animal dung provides nutrients to various types of seedlings to grow.
All these activities of animals dwelling in the forest help it to grow and regenerate.
Q2 Explain how forests prevent oods.
Answer. Forest acts as a natural absorber of water. It allows rainwater to seep through. In the
absence of trees, the rain water would hit the ground directly resulting in ood. However,
because of the presence of trees, rain water does not hit the ground directly. It rather hits the
ground slowly. Hence, before ooding, all the rain water seeps through ground. In this way,
forests prevent oods.
Q3 What are decomposers? Name any two of them. What do they do in the forest?
Answer. Decomposers are micro-organisms that convert the dead plants and animals to
humus. Bacteria and fungi are the two types of decomposers. They help in the process of
recycling of nutrients by decomposing various dead organisms such as plants and animals to
form humus.
Q4 Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in
the atmosphere.
Answer. Forests 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.
Page 1 of 4 Aglasem Schools
Page 3
Book : Science Ncert Solutions | Chapter-17 Science
Plants consume carbon dioxide released by the animals. In this way, plants help in
maintaining a balance of oxygen and carbon dioxide in atmosphere.
Q5 Explain why there is no waste in a forest.
Answer. There is no waste in a forest because micro-organisms act on the wastes and convert
them to humus. This humus ensures that the nutrients are returned back to the soil.
Q6 List ve products we get from forests?
Answer. 1. Wine Corks
2. Natural Aspirin and Acne Medication
3. Sponges
4. Rubber
5. Carnauba Wax
Q7 Fill in the blank:
(a) The insects, butter ies, honeybees and birds help owering plants in________ .
(b) A forest is a puri er of _________ and ___________.
(c) Herbs form the ___________ layer in the forest.
d) The decaying leaves and animal droppings in a forest enrich the ____________.
Answer. (a) The insects, butter ies, honeybees and birds help owering plants
in pollination.
(b) A forest is a puri er of air and water.
(c) Herbs form the lowest layer in the forest.
Page 2 of 4 Aglasem Schools
Plants consume carbon dioxide released by the animals. In this way, plants help in
maintaining a balance of oxygen and carbon dioxide in atmosphere.
Q5 Explain why there is no waste in a forest.
Answer. There is no waste in a forest because micro-organisms act on the wastes and convert
them to humus. This humus ensures that the nutrients are returned back to the soil.
Q6 List ve products we get from forests?
Answer. 1. Wine Corks
2. Natural Aspirin and Acne Medication
3. Sponges
4. Rubber
5. Carnauba Wax
Q7 Fill in the blank:
(a) The insects, butter ies, honeybees and birds help owering plants in________ .
(b) A forest is a puri er of _________ and ___________.
(c) Herbs form the ___________ layer in the forest.
d) The decaying leaves and animal droppings in a forest enrich the ____________.
Answer. (a) The insects, butter ies, honeybees and birds help owering plants
in pollination.
(b) A forest is a puri er of air and water.
(c) Herbs form the lowest layer in the forest.
Page 2 of 4 Aglasem Schools
Page 4
Book : Science Ncert Solutions | Chapter-17 Science
(d) The decaying leaves and animal droppings in a forest enrich the soil.
Q8 Why should we worry about the conditions and issues related to forests far from us?
Answer. There are various reasons for which we should be vigilant about matters related to
forests.
(i) A decrease in forest area would lead to an increase in carbon dioxide in air. This will lead to
an increase of earth's temperature.
(ii) Soil erosion would occur if there are no forests.
(iii) Floods would be more frequent in absence of forests.
(iv) Forests provide shelter and food to animals. When forests are adversely affected, the
habitats of wild animals are also adversely affected.
Therefore, we need to conserve our forests.
Page : 218 , Block Name : Exercise
Q9 Explain why there is a need of variety of animals and plants in a forest.
Answer. A greater variety of plants and animals in the forests helps it to regenerate and grow.
Greater variety of plants means more food and habitat for the herbivores. An increase in
herbivores means more food for carnivores. Decomposers help to maintain the supply of
nutrients to the soil and to the growing plants. This wide variety makes forest a dynamic living
entity.
Page : 218 , Block Name : Exercise
Q10 In gure, 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
Answer.
Page 3 of 4 Aglasem Schools
(d) The decaying leaves and animal droppings in a forest enrich the soil.
Q8 Why should we worry about the conditions and issues related to forests far from us?
Answer. There are various reasons for which we should be vigilant about matters related to
forests.
(i) A decrease in forest area would lead to an increase in carbon dioxide in air. This will lead to
an increase of earth's temperature.
(ii) Soil erosion would occur if there are no forests.
(iii) Floods would be more frequent in absence of forests.
(iv) Forests provide shelter and food to animals. When forests are adversely affected, the
habitats of wild animals are also adversely affected.
Therefore, we need to conserve our forests.
Page : 218 , Block Name : Exercise
Q9 Explain why there is a need of variety of animals and plants in a forest.
Answer. A greater variety of plants and animals in the forests helps it to regenerate and grow.
Greater variety of plants means more food and habitat for the herbivores. An increase in
herbivores means more food for carnivores. Decomposers help to maintain the supply of
nutrients to the soil and to the growing plants. This wide variety makes forest a dynamic living
entity.
Page : 218 , Block Name : Exercise
Q10 In gure, 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
Answer.
Page 3 of 4 Aglasem Schools
Page 5
Book : Science Ncert Solutions | Chapter-17 Science
Page : 218 , Block Name : Exercise
Q11 Which of the following is not a forest product?
(i) Gum
(ii) Plywood
(iii) Sealing wax
(iv) Kerosene
Answer. (iv)Kerosene
Page : 218 , Block Name : Exercise
Q12 Which of the following statements is not correct?
(i) Forests protect the soil from erosion.
(ii) Plants and animals in a forest are not dependent on one another.
(iii) Forests in uence the climate and water cycle.
(iv) Soil helps forests to grow and regenerate.
Answer. (ii)Plants and animals in a forest are not dependent on one another.
Page : 218 , Block Name : Exercise
Q13 Micro-organisms act upon the dead plants to produce
(i) sand
(ii) mushrooms
(iii) humus
(iv) wood
Answer. (iii) humus
Page : 218 , Block Name : Exercise
Page 4 of 4 Aglasem Schools
Page : 218 , Block Name : Exercise
Q11 Which of the following is not a forest product?
(i) Gum
(ii) Plywood
(iii) Sealing wax
(iv) Kerosene
Answer. (iv)Kerosene
Page : 218 , Block Name : Exercise
Q12 Which of the following statements is not correct?
(i) Forests protect the soil from erosion.
(ii) Plants and animals in a forest are not dependent on one another.
(iii) Forests in uence the climate and water cycle.
(iv) Soil helps forests to grow and regenerate.
Answer. (ii)Plants and animals in a forest are not dependent on one another.
Page : 218 , Block Name : Exercise
Q13 Micro-organisms act upon the dead plants to produce
(i) sand
(ii) mushrooms
(iii) humus
(iv) wood
Answer. (iii) humus
Page : 218 , Block Name : Exercise
Page 4 of 4 Aglasem Schools
Document Details
| Board / Org | NCERT |
| Exam | Class 7 |
| Type | Solution |
| Pages | 5 |
| Updated | 30 Apr 2026 |