NCERT Solutions for Class 7 Science Chapter 17 Forests Our Lifeline

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 so that students can learn the concept of the chapter in an interactive manner.

The solutions are prepared by expert teachers in a unique manner to help students understand the concepts with ease. NCERT Solutions will help students to get familiar with the exam pattern and the syllabus of 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 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 the dead plants and animals to humus are known as decomposers. Example: bacteria and fungi. They help in recycling of nutrients by decomposing dead plants and animals.

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

Solution:

Plants in the forests consume carbon dioxide and release oxygen by 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 waste created is bio-degradable, which gets converted to humus by the action of microorganism.

6. List five products we get from forests.

Solution:

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

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

Solution:

Variety of plants and animals in the forests helps plants to regenerate and grow. More excellent range of plants supports herbivores, which in turn serve as food for carnivores. Decomposers turn dead animals and plants into humus; thereby maintain nutrient recycling. This wide variety makes 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, water table.

Solution:

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 – is incorrect

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

(i) sand (ii) mushrooms (iii) humus (iv) wood

Solution:

Answer is (iii) humus

NCERT Solutions Class 7 Science Forests: Our Lifeline Introduction

Class 7 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. Man’s 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

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

There are about 13 questions present in the Chapter 17 of NCERT Solutions for Class 7 Science. It includes short answer questions and multiple choice questions explained in a simple language. Students who are not able to answer the questions from the textbook can refer to the solutions to get a clear overview of the chapter. By practising these questions on a daily basis, students will be able to score well in the annual exam. It improves confidence among students to answer complex questions without any difficulty.

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

The micro organisms which convert the dead animals and plants to humus are called decomposers. For example, bacteria and fungi help in recycling the 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 make use of a simple and understandable language to help students 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.

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

From the 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, forest has become a home to various species of animals and plants. They form the ecosystem in which each species has a unique role to play. For a better knowledge about this chapter, students are advised to solve the textbook questions using the NCERT Solutions from BYJU’S.