Conservation of Plants and Animals
Science Class Eight
NCERT Solution part-2
Conservation of Plants and Animals Question (4) What will happen if
(a) We go on cutting trees
Answer
Trees absorbs carbon dioxide and give oxygen out. Animals inhale oxygen to live and exhale carbon dioxide. Animals cannot live without oxygen. On the other hand plants give us food. Animals depend directly or indirectly on plants.
Thus, if we go on cutting trees, we cannot get food and oxygen and ultimately die.
(b) The habitat of an animal is disturbed
Answer
All animals are important to maintain ecology. For example vultures and eagles clean our environment by eating decaying animals.
Along with this all animals together form food chain.
Thus, if the habitat of an animal is disturbed, animals would start dying and our food chain would disturbed. And finally all animals including human would die.
(c) The top layer of soil is exposed
Answer
The top layer of soil contains humus and necessary for agriculture. We need agriculture to get food. Thus, if the top layer of soil is exposed, the speed of erosion of soil will increase and land would become barren. This leads to flood, draught and ultimately to famine. Which would be proved devastating to human and other all animals.
Conservation of Plants and Animals Question (5) Answer in brief
(a) Why should we conserve biodiversity?
Answer
Biodiversity or Biological diversity refers to the variety of organisms existing on the earth, their interrelationships and their relationship with the environment.
In other words, Biodiversity is the variety of plants, animals and microorganisms generally found in the Biodiversity Reserve.
All animals and plants are necessary to maintain ecology. If ecology will be disturbed then it would be proved fatal for all animals including human.
Thus, it is necessary to conserve biodiversity to keep life live on the earth.
(b) Protected forests are also not completely safe for wild animals. Why?
Answer
Government lays down rules, methods and policies to protect and conserve forests.
In protected forests cutting of any tree, killing (poaching) or capturing of any animals are strictly prohibited. But people living in the neighbourhood capture and kill animals for their malafide interests. And they encroach the forest and destroy them this disturbs the habitat of animals.
Thus, due to wrong intensions of some people wild animals are not completely safe even in protected forests.
(c) Some tribals depend on the jungle. How?
Answer
People who live in jungle are known as tribals. Tribals depend on forest for their livelihood. Tribals collect wood, resin, different leaves, etc. from the forest and sell them in the nearby market to earn their livelihood.
Government lays down many rules and programme for tribals, but instead of that many tribals still depend on forest due to lack of awareness.
(d) What are the causes and consequences of deforestation?
Answer
Casues of Deforestations are of two types; first man made and second natural.
Procuring land for cultivation, clearing of forest for building houses and factories, cutting of trees to make furniture and using of wood as fuel. These causes lead to deforestation. These causes are man-made.
And earth quake, flood, drought, etc. are some main natural causes of deforestation.
Consequences of deforestation
Increase in temperature of earth, increase in pollution, decrease in the level of ground water, desertification, drought, decrease in fertility of soil, decrease of availability of forest produce, are the main consequences of deforestation.
(e) What is Red Data Book?
Answer
RED DATA BOOK is the source book which keeps a record of all the endangered animals and plants. There are different RED DATA BOOK for animals, plants and other species.
(f) What do you understand by the term migration?
Answer
Temporary displacement of large number birds, animals and even human to new area in search of food due to harsh climatic and other conditions is termed as migration.
There are many birds fly to far away areas every year during particular time because of climatic changes. Birds who cover long distances to reach another land are known as migratory birds.
Human also goes to far places to earn their livelihood, this is also a type of migration.
Conservation of Plants and Animals Question (6) 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
It is not justified to cut trees to meet the ever-increasing demand in factories and shelter.
There are many harmful effects of cutting of trees continually. The continually cutting of trees ultimately leads to deforestation.
Some of the consequences of cutting of trees are as follows:
(a) Increase in temperature of Earth
(c) Increase in Pollution
(d) Decreasing level of Ground Water
(e) Droughts
(f) Desertification
(g) Decrease the fertility of Soil
(h) Decreasing of availability of forest produce
Result of these consequences of cutting of trees i.e. deforestation prove lethal for life on earth.
So, we should stop the cutting of trees to save earth.
Conservation of Plants and Animals Question (7) 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 maintain the green wealth of our locality by taking these actions:
(i) By protecting cutting of trees of our locality.
(ii) By plating more trees.
(iii) If a tree removed in any circumstances, the planting new one at that site.
(iv) By protecting trees and plants in garden and park nearby.
(v) By cleaning the garden and park nearby.
(vi) Run a drive to aware about the importance of plant in our life and on earth.
Conservation of Plants and Animals Question (8) Explain how deforestation leads to reduced rainfall.
Answer
Plants release water vapour during transpiration. The release of water vapour takes place through stems and leaves of plant is known as transpiration.
The released water vapour increase the concentration of cloud. This ultimately leads to rainfall in the area having more number of trees.
Thus, more number of trees increases the transpiration rate which increase the rainfall and vice versa.
Thus, deforestation leads to less rainfall which may be resulted in draught and famine.
Conservation of Plants and Animals Question (9) Find out about national parks in your state. Identify and show their location on the outline map of India.
Answer
Some of the National Parks in India
| Name of National Park | State |
|---|---|
| Anamudi Shola National Park | Kerala |
| Anshi National Park | Karnataka |
| Bandhavgarh National Park | Madhya Pradesh |
| Bandipur National Park | Karnataka |
| Betla National Park | Jharkhand |
| Bhitarkanika | Odisha |
| Dudhwa National Park | Uttar Pradesh |
| Gir Forest National Park | Gujarat |
| Jim Corbett National Park | Uttarakhand |
Conservation of Plants and Animals Question (10) Why should paper be saved? Prepare a list of ways by which you can save paper.
Answer
Tree is required to manufacture paper. Consequently more paper requires more number of trees. Thus, it is necessary to save paper to save trees.
Paper can be saved by three R theory.
These three R stands for Reduce, Reuse and Recycle.
(i) Thus, we should reduce the use of paper. This means we should not left paper blank while using. Try to use every corner of paper.
(ii) We should reuse paper. For example we can reuse envelops. We should reuse the bland areas of used notebook for rough work.
(iii) We should send paper for recycle instead of throwing them in dustbin.
Conservation of Plants and Animals Question (11) 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
Down
1. Exinct
2. Reddatabook
5. Deserts
Across
1. Extinct
3. Endemic
4. Biodiversity
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