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

Q:

Micro-organisms act upon the dead plants to produce (i) sand (ii) mushrooms (iii) humus (iv) wood

A:

Micro-organisms act upon the dead plants to produce (iii) humus

Q:

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.

A:

The incorrect statement is: (ii) Plants and animals in a forest are not dependent on one another.

Q:

Which of the following is not a forest product? (i) Gum (ii) Plywood (iii) Sealing wax (iv) Kerosene

A:

(iv) Kerosene

Q:

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.

A:

The correctly labelled diagram with arrow marks is as shown below:

Q:

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

A:

We should be concerned with the conditions and issues related to forests because of the following reasons:

  1. Forests maintain the balance between oxygen and carbon dioxide in the atmosphere. This helps in preventing the increase in temperature of earth’s atmosphere.
  2. Forests prevent floods and erosion of soil.
  3. Forests provide us with many important products like, timber, firewood, honey, beeswax, herbal medicines etc.
  4. Forests help a region in receiving sufficient amount of rainfall.
  5. Forests also curb noise pollution.

Q:

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_______.

A:

(a) pollination
(b) air, water
(c) lowest
(d) soil

Q:

List five products we get from forests?

A:

The five products which we get from the forests are as follows:

  1. Timber
  2. Firewood
  3. Wax
  4. Gum
  5. Spices

Q:

Explain why there is no waste in a forest.

A:

There is no waste in a forest because animal droppings, dead remains of plants and animals, are acted upon by the decomposers which convert them back into useful nutrients. These recycled nutrients are utilised by the plants and microorganisms for growth and reproduction. Thus, all the waste material generated in the forest is converted into useful materials and no waste is left in the forest.

Q:

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

A:

Forests are considered as carbon sinks which absorb carbon dioxide from the atmosphere and utilise it in the process of photosynthesis. In turn, they release oxygen, which is the by-product of photosynthesis formed along with carbohydrates. In this way, forests maintain the balance of oxygen and carbon dioxide in the atmosphere.

Q:

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

A:

Decomposers are the microorganisms, like fungi and bacteria, that breakdown dead and decaying remains of plants and animals into the nutrients to be utilised by other organisms. In this way, decomposers recycle the nutrients and make them available to the soil from which other organisms can uptake and utilize them.

Q:

Explain how forests prevent floods.

A:

The roots of the trees anchor the top soil firmly and prevent erosion of soil and underlying rocks. Those banks of rivers and streams, which are guarded by forests, delimit them and prevent their overflow. Also, the heavy flow of rain is received by the forest canopy and as water reaches the ground, its flow slows down. This further prevents cutting away of fertile top soil and provide ample time for seepage of water into the ground. Therefore, forests are helpful in preventing floods.

Q:

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

A:

Organic matter, generated by animals in the form of animal droppings and dead remains, contains lots of nutrients. These nutrients are recycled by the decomposers into the soil and made available to young saplings and microorganisms facilitating their growth. This helps forest to regenerate its lost resources. Further, animals also help in dispersal of seeds to larger distances which help in expansion of forest cover. Thus, animals play a vital role in growth and regeneration of forests.

Q:

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

A:

Large variety of plants and animals provide greater choice of food resources to all the life forms. This helps in growth in populations and varieties of both herbivores and carnivores. These animals play important roles in circulation of nutrients and energy through food chain and dispersal of seeds to larger distances. Such processes define and contribute in the growth, expansion, development and regeneration of a forest.

Benefits of NCERT Solutions

Following are some of the benefits of using NCERT Solutions by Extramarks.

1. The NCERT solutions for class 7 are prepared keeping in mind the necessary rules and format issued by the CBSE board thus providing students much-needed preview of the exam pattern of questions and preview of the exam that they are going to face during the final exams.

2. The students can be sure about the quality of the solutions as they are committed by highly experienced and expert teachers. These teachers have years of experience and they make sure that there is no mistake committed when preparing the solutions.

3. The NCERT 7 solutions are provided for the questions that are most likely to appear in the exam thus improving the efficiency of the students by helping them prepare for the important parts of the syllabus.

Tips & Strategies for Class 7 Exam Preparation

1. Start your revision early so you can revise well and grasp all the difficult concepts.

2. Organize your study time by making a timetable as it will help you manage your time accordingly.

3. Take mock tests and solve sample papers as they will help you learn time management during the exam and make you familiar with the exam pattern.

4. Take regular breaks, look after yourself by sleeping properly and eating well.

5. Know your exam well, explore the mock tests, and practice sample papers as much as you can.

Why Choose Extramarks CBSE Class 7 Study Materials?

1. The solutions have been compiled keeping in mind the purpose of scoring high marks in exams thus they have everything that the students need to prepare for exams.
2. The NCERT solutions for class 7 are designed in a clear and simple language complete with diagrams so that the students understand the subject well.
3. The NCERT 7 solutions are accurate thus improving their reliability.
4. The solutions are designed by expert and experienced teachers that help in removing all doubts out of the solutions and improving the credibility of the answers.

Frequently Asked Questions

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Is class 7 Math NCERT book sufficient for prepare for the exams?

Yes, the NCERT book has been designed keeping in mind the pattern of paper that will be presented in the exam to students. The NCERT book is sufficient to study for the exam as it has everything related to the exam and contains all information out of which the questions will be asked in the exam. But if you want to prepare a little bit extra, we suggest that you go through the NCERT class 7 solutions.

When to refer to NCERT solutions for class 7th?

When you are studying the NCERT book for math and other subjects for your class 7 exams, refer to the NCERT class 7 solutions simultaneously so you can see where you are going wrong and what are you getting right in your exercises’ attempt.

Why are the NCERT solutions important for Class 7th?

The class 7th is very crucial as it is among the major middle school classes during which the child’s base is formed in math and science and even in other subjects like English. Thus, it is students must study smartly in this class and ace their exams while getting all the help they need from the NCERT 7 solutions given by Extramarks.

Can I rely on the NCERT solutions for class 7 Math at Extramarks to perform well in the annual exam?

Yes, absolutely. The NCERT solutions provided by Extramarks for class 7 are eloquent and elaborate at best and are thus useful for students studying for the final exams of class 7. The students will have many questions and doubts regarding the NCERT solutions for class 7 and this is why the solutions have been elaborated well to help students understand the answers to exercises.

Do you provide NCERT solutions for Class 7 Math for free?

Yes, the NCERT solutions for Math and other subjects for class 7 are available for free from Extramarks.

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