NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline

*According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 12.

NCERT Solutions Class 7 Science Chapter 17 Forests: Our Lifeline is one of the most interesting chapters in Class 7 Science. The Class 7 Science NCERT Solutions for Chapter 17 are provided here for the students to learn the concept covered in this chapter in an interactive manner.

The solutions are prepared by expert teachers in a unique manner to help students understand the concepts easily. NCERT Solutions will help students to get familiar with the exam pattern, and the types of questions asked in the examination.

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Exercise Questions

1. Explain how animals dwelling in the forest help it grow and regenerate.

Solution:

Animals dwelling in the forest help it grow and regenerate in the following ways:

  • Animals help in dispersing plant seeds.
  • Decaying animal dung provides nutrients for plants to grow
  • Microorganisms convert the dead plants and animals to humus

2. Explain how forests prevent floods.

Solution:

Plants in the forests will not allow the rainwater to fall directly on the earth, and these plants also hold water which helps in preventing floods.

3. What are decomposers? Name any two of them. What do they do in the forest?

Solution:

The micro-organisms which convert dead plants and animals to humus are known as decomposers. For example, bacteria and fungi. They help in the recycling of nutrients by decomposing dead plants and animals.

4. Explain the role of forests in maintaining the balance between oxygen and carbon dioxide in the atmosphere.

Solution:

Plants in the forests consume carbon dioxide and release oxygen through the photosynthesis process. This helps in balancing oxygen and carbon dioxide in the atmosphere.

5. Explain why there is no waste in a forest.

Solution:

There is no waste in a forest because the waste created is bio-degradable, which gets converted to humus by the action of microorganisms.

6. List five products we get from forests.

Solution:

The five products we get from forests are listed below:

i) Medicines

ii) Spices

iii) Wood

iv) Paper

v) Gum

7. Fill in the blanks:

(a) The insects, butterflies, honeybees and birds help flowering plants in _______.

(b) A forest is a purifier of ________ and ________.

(c) Herbs form the ________ layer in the forest.

(d) The decaying leaves and animal droppings in a forest enrich the ________.

Solution:

(a) The insects, butterflies, honeybees and birds help flowering plants in pollination.

(b) A forest is a purifier of air and water.

(c) Herbs form the lowest layer in the forest.

(d) The decaying leaves and animal droppings in a forest enrich the soil.

8. Why should we worry about the conditions and issues related to forests far from us?

Solution:

We should worry about the forest for the following reasons:

  • A decrease in forests results in an increase in carbon dioxide content in the atmosphere. This results in global warming.
  • Depletion of forests results in soil erosion
  • The decrease in forests adversely affects the lives of animals living in the forest.
  • The absence of forests leads to flooding more often.
  • Due to the reduction of forests, the land will turn barren, which is called desertification.

9. Explain why there is a need for a variety of animals and plants in a forest.

Solution:

A variety of plants and animals in the forests helps plants to regenerate and grow. A wide range of plants supports herbivores, which in turn serve as food for carnivores. Decomposers turn dead animals and plants into humus, thereby maintaining nutrient recycling. This wide variety makes the forest a dynamic living entity.

10. In Fig. 17.15, 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, and water table.

forests our lifeline

Solution:

forests our lifeline

11. Which of the following is not a forest product?

(i) Gum

(ii) Plywood

(iii) Sealing wax

(iv) Kerosene

Solution:

The answer is (iv) Kerosene

12. 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 influence the climate and water cycle.

(iv) Soil helps forests to grow and regenerate.

Solution:

Statement (ii) Plants and animals in a forest are not dependent on one another.

13. Micro-organisms act upon the dead plants to produce

(i) sand

(ii) mushrooms

(iii) humus

(iv) wood

Solution:

The answer is (iii) humus

NCERT Solutions Class 7 Science Forests: Our Lifeline Introduction

Class 7 NCERT Solutions for Science Forests: Our Lifeline specifically deals with the issues of forests and the importance of forests to our life. Forests have always been a source of many natural resources over the decades. Our ancestors considered forests to be their home for millions of years. It is only with the advent of civilisation that we started to move away from forests and started producing our source of food and resources. Today, the forests are home to many species of plants and animals. They form the ecosystem, and each species has a specific role to play.

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Frequently Asked Questions on NCERT Solutions for Class 7 Science Chapter 17

Q1

How many questions are present in Chapter 17 of NCERT Solutions for Class 7 Science?

There are about 13 questions present in Chapter 17 of NCERT Solutions for Class 7 Science. It includes short answer questions and multiple-choice questions explained in simple language. Students who are facing problems in answering the questions from the textbook can refer to the solutions to get a clear idea of answering the questions, along with an overview of the chapter. By practising these questions on a daily basis, students will be able to score well in the annual exam. It also improves the confidence of students to answer complex questions without any difficulty.
Q2

What are decomposers explained in Chapter 17 of NCERT Solutions for Class 7 Science?

The microorganisms which convert dead animals and plants to humus are called decomposers. For example, bacteria and fungi help in recycling nutrients by decomposing dead animals and plants. Students can refer to the NCERT Solutions from BYJU’S to get a clear idea about this concept. The subject-matter experts designed these solutions in simple and understandable language to help students understand the topics and score well in the annual exam. Using these solutions, students will get an overall idea about the chapter and the questions which are important for the exam.
Q3

What does Chapter 17 of NCERT Solutions for Class 7 Science convey?

From Chapter 17 of NCERT Solutions for Class 7 Science, students will learn about the issues of forests and the importance of forests in our lives. Many natural resources have been available in the forests over the decades. In the current generation, the forest has become a home to various species of animals and plants. They form an ecosystem in which each species has a unique role to play. For a better understanding of the concepts and topics covered in this chapter, students are advised to solve the textbook questions referring to the NCERT Solutions from BYJU’S.
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