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

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

We have Provided the CBSE Solutions chapter-wise. Class 8 Science Chapter 7 Conservation of Plants and Animals with Answers by expert subject teacher for latest syllabus and examination. Students can take a free CBSE Solutions of Conservation of Plants and Animals. Each question has right answer Solved by Expert Teacher.

CBSE Solutions Class 8 Science Beehive Prose

Page No. 86

Exercise

Q1. Fill in the blanks:

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

(b) Species found only in a particular area are known as ___________.
(c) Migratory birds fly to far away places because of _ changes.

Answer: (a) sanctuary.
(b) endemic.
(c) climatic

Q2. Differentiate between the following.

(a) Wildlife sanctuary and biosphere reserve

Answer:

Wildlife sanctuaryBiosphere Reserve
1) An area within which wild animals are protected from external dangers like hunting
b) Adequate habitat and protection are provided for the wild animals living in a sanctuary
c) Eg: Corbett national park
a) An area constructed for the conservation of biodiversity
b) Several life forms like plants, animals, and micro-organisms conservation are possible in a reserve
c) Eg: Nilgiri Biosphere reserve

(b) Zoo and wildlife sanctuary

Answer:

ZooWildlife Sanctuary
1) It is a man-made habitat.
2) Animals are kept in cages, and their feeding and reproduction are regulated.
a) It protects animals’ natural habitats.
b) They are free to travel around, and their feeding and reproduction are not regulated.

(c) Endangered and extinct species

Answer:

Endangered Species:Extinct Species:
1) The animal species whose numbers are diminishing to a level that they might face extinction.a) The animal species, whose numbers are nil (zero), because of changes in their habitat and other calamities.

(d) Flora and fauna

Answer:

Q3. Discuss the effects of deforestation on the following.

(a) Wild animals

Answer: Effects of deforestation on wild animals: Deforestation is the removal of trees or other vegetation from an area for industrial, agricultural, or other purposes. Trees and other vegetation form the habitat of many animals. Hence, if the habitat of wild animals is destroyed, then their numbers would automatically decline.

(b) Environment

Answer: Environment is adversely effected by deforestation as ecological balance is disturbed. Less number of plants lead to the rise in carbon-dioxide levels. The increase carbon dioxide causes global warming. It even leads to change in soil properties. All this may result in floods and droughts.

(c) Villages (Rural areas)

Answer: The villagers depend on forests for their basic needs. They are closely related to forests. Due to deforestation, various wild animals run to nearby villages and cause danger to people living there. Also, villagers will not get sufficient fruits, fuel and wood due to deforestation.

(d) Cities (Urban areas)

Answer: Deforestation in cities can increase the risk of many natural calamities such as floods and droughts in that area.

(e) Earth

Answer: Deforestation leads to increased chances and occurrences of desertification, droughts and floods. Carbon Dioxide level in the earth’s atmosphere also increases which leads to global warming. The water cycle is disrupted and there is also an increased risk of natural calamities.

(f) The next generation

Answer: Deforestation will majorly affect the life of next generation. The next generation will face problems at every step. Climatic conditions will be adversely affected. There will be scarcity of food and clean environment. Next generation won’t be able to see most of the animal species due to habitat loss.

Q4. What will happen if:

(a) we go on cutting trees.
(b) the habitat of an animal is disturbed.
(c) the top layer of soil is exposed.

Answer: (a) If we continue to cut down trees indefinitely, the trees will eventually vanish from the face of the earth. Animals and birds will be displaced from their natural environment. Biodiversity will be extinct. The water cycle has been thrown off. The rainfall pattern has been thrown off. There are floods and droughts to be seen. Soil degradation, desertification, and natural disasters will all become more common.

(b) If the habitat of an animal is disturbed, then:

  • The animals will lose their natural habitat and ultimately will be at the periphery to become endangered.
  • The survival of animal will be difficult, because of the drought and the rise in temperature.

(c) Removal of top layer of soil by floods and heavy winds will expose the lower hard and rocky layers. This soil has less humus and less fertility.

Q5. Answer in brief:

(a) Why should we conserve biodiversity?

Answer: Biodiversity refers to the number and variety of various life forms such as plants, animals, and micro-organisms in an area. Plants and animals depend on each other for survival. This means that the destruction of either of the two will affect the life of the other. Hence, we need to conserve biodiversity to maintain the balance of nature.

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

Answer: Protected forests are also not completely safe for wild animals because the local people depend on the forest and may kill animals for meat. The poachers may access these areas and kill for their hide.

(c) Some tribals depend on the jungle. How?

Answer: Tribal people have been living in or around the jungle since ages. They use most of the forest produce for their day-to-day needs. For example, they use firewood as kitchen fuel, bamboo to make houses and many useful items, medicinal plants to treat diseases, etc. They also take various items from forests to sell them into the market in order to earn some money. Thus, tribals depend on the jungles in a significant way.

(d) What are the causes and consequences of deforestation?

Answer: The causes of deforestation may be the following:

  • Natural causes like forest fires, droughts, etc.
  • Building factories and houses.
  • Procuring land for cultivation.
  • Making furniture and using wood as fuel.
  • The consequences of deforestation are:
  • Natural calamities like floods, etc.
  • Increase in the temperature of the earth, i.e., global warming.

(e) What is Red Data Book?

Answer: Red Data Book is a source book that maintains an international list of all endangered animal and plant species.

(f) What do you understand by the term migration?

Answer: The movement of an organism or a group of organisms from one place to another at a specific time each year is referred to as migration. Organisms move from one location to another to avoid harsh climatic circumstances or to reproduce.

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: Of course, to meet the ever-increasing demand in factories and for shelter, trees are being continually cut, which is hot justified at all. If one tree is cut, at least five trees should be grown so that the reforestation process may remain continuous.

But, if trees are cut blindly and no trees are planted then the earth may face global warming, no rainfall, climatic change, soil erosion, and desertification, etc. So, cutting trees for any reason at all is not justified.

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: For the maintenance of the green wealth of my locality I will prefer reforestation in the locality. I shall start a campaign, along with my friends, to make the people of locality aware of the importance of trees. Once the people become conscious about the importance of plants they will be requested to do the following-

(a) Each family should plant at least one tree in the monsoon month.
(b) During summer, they should assure watering of the plants everyday.
(c) On the occasion of birthday, marriage ceremony and other happy occasions, they should gift plants to their friends and relatives.

Q8. Explain how deforestation leads to reduced rainfall.

Answer: Deforestation is the removal of trees or other vegetation from an area for industrial, agricultural, or other purposes. Plants or trees absorb CO2 from the atmosphere. If plants are destroyed, then the level of CO2in the atmosphere will rise. The high levels of CO2 in the atmosphere will trap more heat radiations, leading to global warming. This increase in temperature of the Earth will disturb the natural water cycle. As a result of disruption in the water cycle, there will be a change in the rainfall pattern. The reduced amount of rainwater can cause droughts.

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

Answer: Paper is manufactured by using, pulps of tree bark. One tonne of paper is formed from 7 mature trees. We should save paper to protect our trees, because paper can be recycled to make new paper.
We can save paper in a number of ways :

i) Writing on both side of the paper.
ii) Newspapers, old books, notebooks and other papers should be collected and sold to kabadiwala, so that he can further supply it for recycling.
iii) Using the old notebooks for rough work.
iv) Using paper efficiently.

Q11. Complete the world 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. ENDANGERED
  2. RED DATA BOOK
  3. DESERTS

Across

  1. EXTINCT
  2. ENDEMIC
  3. BIODIVERSITY

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