NCERT Solutions for Class 8 Science Chapter 7 Conservation of Plants and Animals

Paheli's Question (Page number - 77)

Q. What is the purpose of making national parks, wildlife sanctuaries and biosphere reserves?

Answer:

The main purpose of making national parks, wildlife sanctuaries and biosphere reserves is to protect the animals from an external threat like prevent from hunting and other danger.

And also to maintain their natural habitat as well as their own environment.

Boojho's Question (Page Number- 77)

Q. How does deforestation reduce rainfall on the one hand and lead to floods on the other?

Answer:

Deforestation means cutting down the trees. And we know that trees play an essential role in the water cycle as it contributes moisture to the air which brings rainfall. So if no. of trees decreases the process of transpiration and water cycle gets disturbed. Hence rainfall will be reduced.

Reduced rain will reduce the amount of water absorption in the soil. This soil will be dry and leads to lower water intake in the trees, and because of that, soil erosion will occur, and it leads to floods.

Activity 7.2 (Page Number - 78)

Q. Animal life is also affected by deforestation. How?

Answer:

Animal life is also affected by deforestation because wild animals lose their shelter and food amount is decreased. So, they start migrating for the search of the food, in this process they might get killed by other animals or hunters. In this way, their life will be affected by deforestation.

Q1. Fill in the blanks.

(a) A place where animals are protected in their natural habitat is called_________.

(b) Species found only in a particular area is known as_________.

(c) Migratory birds fly to far away places because of_________changes.

Answer:

(a) A place where animals are protected in their natural habitat is called Sanctuary.

(b) Species found only in a particular area is known as endemic species .

(c) Migratory birds fly to far away places because of climate changes.

Q2 (a). Differentiate between the following.

Wildlife sanctuary and biosphere reserve

Answer:

Here is the difference between a wildlife sanctuary and a biosphere reserve:

Q2 (b). Differentiate between the following.

Zoo and wildlife sanctuary

Answer:

Here is the difference between zoo and wildlife sanctuary:

Q2 (c). Differentiate between the following.

Endangered and extinct species

Answer:

Here is the difference between endangered and extinct species:

Q2 (d). Differentiate between the following.

Flora and fauna

Answer:

Here is the difference between flora and fauna:

NCERT Solutions for Class 8 Science Chapter 7 - Conservation of Plants and Animals

Q3. Discuss the effects of deforestation on the following. (a) Wild animal

Answer: Due to deforestation, the forests are going to be exterminated and because of that animals are losing their homes as well as their natural habitat. Therefore their populations are going down rapidly.

Q3. Discuss the effects of deforestation on the following. (b) Environment

Answer: Due to deforestation, unbalancing is happen between carbon dioxide and oxygen. Also, it affects the climate of the surrounding environment. Global warming is increased because of the increase in the amount of carbon dioxide.

Q3. Discuss the effects of deforestation on the following- (c) Villages (Rural areas)

Answer- Because of deforestation, in rural areas, the level of groundwater goes down which means access to potable water becomes difficult. Also, more chance of soil erosion is occurring because plant roots that hold the soil particle together is been removed also the fertility of the soil is decreased.

Q3. Discuss the effects of deforestation on the following. (d) Cities (Urban areas)

Answer:- Effects of deforestation on cities:

It can increase the chances of natural calamities like a flood or heavy rainfall. Also, it can lead to global warming because of the increase in the level of carbon dioxide in the atmosphere because of vehicular and industrial pollution. Increase in temperature also disturbs the water cycle.

Q3. Discuss the effects of deforestation on the following. (e) Earth

Answer:

Deforestation disturbs the whole ecological system. As a result of deforestation, an increase in chances of the flood, soil erosion, drought, and desertification increases. Also, increase global warming due to the increase in the level of carbon dioxide. As a result, the total water cycle gets disturbed and also the level of potable water goes down.

Q3. Discuss the effects of deforestation on the following. (f) The next generation

Answer:

Effect of deforestation on the next generation- Deforestation causes many problems such as drought, floods, soil erosion, greenhouse effects, and other global issues, etc. And after all, the consequences of these will affect the future generation.

NCERT Solutions for Class 8 Science Chapter 7 - Conservation of Plants and Animals

Q4. What will happen if.

(a) we go on cutting tree

(a) we go on cutting trees

Answer: If we go cutting the trees, the life of animals and their habitat will get completely vanished.

And because of it, the ecological balance is disturbed. The biodiversity of many areas will be destroyed completely.

Also global warming increase and due to it, the desertification will happen which lead to soil erosion and also more chance of drought.

Q4. What will happen if.

(b) the habitat of an animal is disturbed

Answer:

If the habitat of animals is disturbed, it means their home and foods all are going to have vanished for them.

So they start migrating to the land areas for the search of food and shelter, where people live, and this is dangerous for those people.

Also, animals can get killed by others. As a result whole ecological system is starting to unbalancing.

Q4. What will happen if.

(c) the top layer of soil is exposed.

Answer:

If the top layer of soil is exposed, then it will gradually be exposed to the lower layer of the soil which is mostly rocky and hard in nature.

And this is less fertile because it has less humus.

If the soil erosion is continuously occurring then the land becomes completely fertile.

Q5 (a). Answer in brief.

Why should we conserve biodiversity?

Answer:

We should conserve biodiversity because it contains a variety of life forms like plants, wild animals and micro-organism in an area.

For survival, All plants and animals depend on each other.

If you disturb any one of them, second will affect automatically.

Therefore, we need to protect them to maintain the balance in nature.

Q5(b). Answer in brief.

Protected forests are also not completely safe for wild animals. Why?

Answer:

Protected forests are also not entirely safe for wild animals because of the people who live near the jungle are mainly depends on the forests for their food and other requirement purposes.

So in this process, some wild animals are getting killed and sell them for their greediness of money.

Q5(c). Answer in brief.

Some tribals depend on the jungle. How?

Answer:

Some tribals depend on the jungle because they provide them with shelter, food and other requirements like herbs and so many things which are useful for them.

Q5(d). Answer in brief.

What are the causes and consequences of deforestation?

Answer:

Due to deforestation, there is an increase in temperature and pollution on earth.

It increases the level of carbon dioxide in the atmosphere. Groundwater level also gets lowered. deforestation disturbs the balance in nature.

If we continue the cutting of trees, rainfall and the fertility of the soil will decrease. More chances of natural calamities like floods and droughts.

Q5(e). Answer in brief.

What is Red Data Book?

Answer:

A red data book is a source book. This book keeps the record of endangered animals and plants all over the world.

This book is maintained by IUCN (international union for conservation of nature and natural resources).

Q5(f). Answer in brief.

What do you understand by the term migration?

Answer:

Migration means the movement of a group of an organism from its natural habitat to other places in a particular time of every year.

They do migrate because of the climate change in their habitat.

NCERT Solutions for Class 8 Science Chapter 7 - Conservation of Plants and Animals

Q6. In order to meet the ever-increasing demand in factories and for shelter, trees are being continually cut. Is it justified to cut trees for such projects? Discuss and prepare a brief report .

Answer:

No, It is not at all justified to cut trees to meet the ever-increasing demand in factories and for shelter. Forests are the home for many organisms such as wild animals. Basically, forests are home for the wild animals and they provide us a good quality of air as they give out oxygen and absorbs the carbon dioxide from the surroundings.

They prevent the excess heating of the atmosphere; also they prevent soil erosion. Trees help to increase the fertility of the soil and also preserve biodiversity. To fulfill the need of the human population, we have been cutting so many trees, and as a result, we have to face many problems like global warming, soil erosion, and droughts, etc.

Hence we cannot afford to cut more trees, and we need to save them.

Q7. How can you contribute to the maintenance of green wealth of your locality? Make a list of actions to be taken by you.

Answer:

We can contribute to the maintenance of green wealth of our locality by following ways-

• By taking cares of plants and trees of our surroundings. We can do more number of planting.
• To encourage the people of my area to plant more trees by telling them about the importantness of trees.
• We can aware the young children by telling them the consequences of deforestation and how they affect the environment.
• And also keep watering the plants, so that they can grow healthy and easily.

Q8. Explain how deforestation leads to reduced rainfall.

Answer:

Deforestation means the removal of trees or plants from an area for different purposes.

We know that plants absorb carbon dioxide from the atmosphere. and if there is no plant, the level of carbon dioxide in the atmosphere will rise.

These lead to increasing the temperature of the earth, and it will disturb the water cycle. As a result of the disruption in the water cycle, also affect the rainfall pattern.

Q9. Find out about national parks in your state. Identify and show their location on the outline map of India.

Answer:

Name of the state- West Bengal

National park- Sundarban nation park

Here below the outline of Sundarban national park

CBSE NCERT Solutions for Class 8 Science Chapter 7 Conservation of Plants and Animals

Q10. Why should paper be saved? Prepare a list of ways by which you can save paper.

Answer:

The paper should be saved because to make one-tonne paper we need to cut approximately seventeen fully grown tree. Therefore, to save trees and prevent the impact of their loss on living organisms. we need to save the papers.

Paper can be saved by following ways-

1. by collecting used paper and recycle it
2. use both sides of the paper
3. Spread the awareness about paper
4. Use paper efficiently

Q11. Complete the word puzzle.

Down

1. Species on the verge of extinction.

2. A book carrying information about endangered species.

5. Consequence of deforestation.

Across

1. Species which have vanished.

3. Species found only in a particular habitat.

4. Variety of plants, animals and microorganisms found in an area.

Answer:

1. ENDANGERED & EXTINCT
2. RED DATA BOOK
3. ENDEMIC
4. BIODIVERSITY
5. DROUGHT