DAV Class 8 Science Chapter 8 Question Answer – Conservation of Plants and Animals

The DAV Class 8 Science Book Solutions and DAV Class 8 Science Chapter 8 Question Answer – Conservation of Plants and Animals are essential study tools for DAV public school students in Class 8.

DAV Class 8 Science Ch 8 Question Answer – Conservation of Plants and Animals

DAV Class 8 Science Ch 8 Solutions – Conservation of Plants and Animals

Something To Know

A. Fill in the blanks:

Question 1.
International Day for biological diversity is observed on ________ .
Answer:
May 22

Question 2.
A group of organisms, capable of interbreeding under natural conditions, is known as a ________ .
Answer:
species

Question 3.
________ species are the species that are found only in a particular area.
Answer:
endemic

Question 4.
________ is an important reserve for Project Tiger.
Answer:
Sunderbans Biosphere Reserve

Question 5.
________ sanctuary in Odisha is the breeding ground for the ‘giant olive ridley turtle’ which migrate here from the Pacific Ocean.
Answer:
Gahirmatha Turtle Sanctuary

B. Match the following:

Column I	Column II
(1) Rhinoceros	(a) Vulnerable
(2) Giant Panda	(b) Kaziranga National Park
(3) Flamingos	(c) Extinct
(4) Cheetah	(d) Endangered
(5) Passenger pigeon	(e) Migration

Answer:

Column I	Column II
(1) Rhinoceros	(b) Kaziranga National Park
(2) Giant Panda	(d) Endangered
(3) Flamingos	(e) Migration
(4) Cheetah	(a) Vulnerable
(5) Passenger pigeon	(c) Extinct

C. Tick (✓) the correct option:

Question 1.
Protection, and preservation of wildlife and natural resources is known as-
(a) Afforestation
(b) Preservation
(c) Deforestation
(d) Conservation
Answer:
(d) Conservation

Question 2.
The cheetah is a vulnerable species because-
(a) It is found in selected areas.
(b) It will be ‘extinct’ soon.
(c) It will be ‘endangered’ soon.
(d) Its hunting is banned.
Answer:
(c) It will be ‘endangered’ soon.

Question 3.
Plants found in a particular area are referred to as-
(a) Species
(b) Forest
(c) Flora
(d) Fauna
Answer:
(c) Flora

Question 4.
Which one of the following is not an outcome of deforestation in an area?
(a) Increased rainfall
(b) Increased temperature
(c) Decreased rainfall
(d) Decreased soil erosion
Answer:
(d) Decreased soil erosion

Question 5.
A region in which ‘conservation of biodiversity’ in its natural habitat is practiced is known as a—
(a) Botanical garden
(b) National park
(c) Aquarium
(d) Zoo
Answer:
(b) National Park

D. Answer the following questions in brief:

Question 1.
How have ‘urbanisation and industrialisation’ led to a large scale deforestation?
Answer:
Large areas of forest have been cleared to make way for urbanization and industrialization. Thus, urbanization and industrialization have led to a large scale deforestation.

Question 2.
A new species X is introduced in a forest. How is it likely to affect the local species of the area?
Answer:
The new species may prey on, or compete for resources with the existing species. Thus, introduction of a new species is generally harmful for the ecosystem of a forest.

Question 3.
What is a Biosphere Reserve? Name two biosphere reserves in India.
Answer:
Biosphere reserve is an international conservation designation given by the UNESCO under its programme on ‘Man and the Biosphere (MAB)’.
Two examples of biosphere reserves in India are: Nilgiri Biosphere Reserve and Nanda Devi Biosphere Reserve.

Question 4.
How does the ‘Red Data Book’ help in protecting biodiversity?
Answer:
Red Data Book provides the list of animals and plants whose continued existence is under threat. Thus, it helps in identifying the species at risk. Tirriely corrective measures can be taken to protect such species.

Question 5.
Why do some birds and animals migrate?
Answer:
Some birds and animals need to migrate in search of food and breeding places when conditions at a particular place become too harsh to continue living there.

Question 6.
How do birds ‘get helped’ in navigation while undertaking long distance flights?
Answer:
The precise methods by which animals and birds navigate are still obscure. But it appears that the birds and animals take the help of the Sun and stars, and possibly the earth’s magnetic field. This is achieved through an inbuilt ‘magnetic compass’, which is a tiny mass of tissue, between the eye and the brain in birds.

Question 7.
Distinguish between a National Park and a Wildlife Sanctuary.
Answer:
Most of the human activities are prohibited in a National Park. It is profected from human development and pollution. Whereas some human activities are permitted in a Wildlife Sanctuary. Hunting, killing or capturing of animals is prohibited in Wildlife Sanctuary.

E. Answer the following questions:

Question 1.
Explain how deforestation can result in droughts and floods.
Answer:
Trees help in reducing the flow of water. Thus, trees help in preventing soil erosion. Trees also help in rains by making immense contribution to atmospheric moisture by way of transpiration. Deforestation results in reduced and erratic rainfall which often results in droughts. Absence of obstruction from trees also results in excess water flow causing flood.

Question 2.
‘Extinction of tiger can destabilize the entire forest ecosystem and result in a large scale loss of biodiversity. ’ Justify this statement.
Answer:
Tigers are important components of an ecosystem. Being at the top of the food pyramid, tigers check the population of herbivores. This helps in preventing the green plants from being wiped out. Absence of tigers from the ecosystem would result in population explosion of herbivores. This will have disastrous consequences on the ecosystem.

Question 3.
Why are endemic species at a greater risk of becoming extinct? List the “human action related causes’ that are responsible for their extinction.
Answer:
Endemic species are adapted to live in limited areas. Any disturbance to their natural habitat can prove to be dangerous for their existence. Hence, they are at a greater risk of becoming extinct. Human related actions that are responsible for the extinction of endemic species are:

• Farming
• Deforestation
• Overgrazing
• Construction activities

Question 4.
The growing human population poses a grave threat to biodiversity.’ Justify this statement.
Answer:
Growing human population means that more land is required for farming, for making new houses and for making roads and industries. This necessitates deforestation. This also increases industrial activities which result in increased levels of environmental pollution. Thus, it destroys the biodiversity in the long run. Hence, it can be said that growing human population poses a grave threat to biodiversity.

Extinct species	Endangered species	Vulnerable species
These species do not longer exist on the earth.	These species face high risk of extinction in near future.	These species face high risk of extinction in medium term.
Examples: Dodo, passenger pigeon	Examples: Giant panda, Snow leopard	Examples: Cheetah, sloth bear

Question 6.
List five ways in which you, as an individual, can contribute to conserving forests and wildlife.
Answer:
The five ways by which one can contribute to conserving forests and wildlife are:

• Reducing the consumption of various items.
• Reusing old items.
• Recycling discarded items.
• By using public transport.
• By using bicycle wherever possible.

Value Based Question

Anil went to the house of his friend Rohan. They decided to draw a picture of their choice on a sheet of white paper. Not happy with their efforts, they crossed many sheets and threw them around. When Rohan’s elder sister saw them wasting paper, she, in a sweet voice, told them that they should not waste paper, just like that. She not only helped them to draw good pictures but also guided them to make interesting toys from the sheets they had thrown around. She explained to them how, by recycling and reusing paper, they can help in conserving/improving our ecosystem.

Question 1.
State the values displayed by Rohan’s elder sister.
Answer:
Rohan’s sister is polite, helpful and possess knowledge about the judicious use of resources.

Question 2.
Why do we say that wasting paper can damage our ecosystem?
Answer:
Paper is made from wood pulp. Trees need to be cut to make paper. So, wasting paper results in deforestation which harms the ecosystem. Hence, it is said that wasting paper can damage our ecosystem.

Question 3.
Have a group discussion in which each student gives his/her suggestions on recycling/reusing waste paper.
Answer:
Do it yourself

Something To Do

Question 1.
Find out about the different zones of a Biosphere Reserve and their significance. Also, prepare a list of all the Biosphere Reserves in India.
Answer:
Do it yourself

Question 2.
Collect information about ‘Hotspots of Biodiversity’. Find out about the flora and fauna of the ones in India and locate them on the map.
Answer:
Do it yourself

Question 3.
Prepare and present a photo essay on any one of the following topics:
(a) Medicinal plants: Preserving traditional Indian Wisdom.
(b) No good air to inhale: Deteriorating air quality of my city.
(c) Living in harmony; Reducing carbon footprints.
Answer:
Do it yourself

Question 4.
Project Tiger has been taken up on a massive scale by the Indian Government. Visit the website http://www.projecttiger.nic.in to find out what you can do to protect the tiger.
Answer:
Do it yourself

Question 5.
Visit the website http://www.wwfindia.org/help/greenliving_tips/ to gather more information about conservation of plants and animals.
Answer:
Do it yourself

DAV Class 8 Science Chapter 8 Solutions – Conservation of Plants and Animals Important Questions and Answers

I. Fill in the blanks:

1. Trees help in recharge of ________ .
Answer:
Groundwater

2. Greenhouse gases result in ________ .
Answer:
Global warming

3. Olive Ridley turtle is found in the state of ________ .
Answer:
Odisha

4. One-horned rhinoceros is found in the state of ________ .
Answer:
Assam

5. Gir National Park is the home of Asiatic ________ .
Answer:
Lions

II. Tick the correct answer:

Question 1.
Which of these is an extinct species?
(a) Dodo
(b) Blue whale
(c) Lion tailed macaque
(d) Asiatic lion
Answer:
(a) Dodo

Question 2.
Which of these is an endangered species?
(a) Blue whale
(b) Giant panda
(c) Snow leopard
(d) All of these
Answer:
(d) All of these

Question 3.
Which of these is an example of endemic species?
(a) Tiger
(b) Lion
(c) Elephant
(d) Kangaroo
Answer:
(d) Kangaroo

Question 4.
Red Data Book is mainly published by which organization?
(a) WWF
(b) UNESCO
(c) IUCN
(d) Department of Forest and Wildlife
Answer:
(c) IUCN

III. Answer the following questions:

Question 1.
What is an ecosystem?
Answer:
A natural unit consisting of all biotic and abiotic factors in an area is called ecosystem.

Question 2.
What do you understand by conservation?
Answer:
The protection, preservation, management or restoration of wildlife resources is known as conservation.

Question 3.
What is a national park?
Answer:
A national park is a reserve of land which is usually declared and owned by the national government. It is protected from most human development and pollution.

Question 4.
What is a wildlife sanctuary?
Answer:
A wildlife sanctuary is an officially designated territory, which provides protection and sustainable living conditions for wild animals. Hunting, killing or capturing of animals is strictly prohibited in such areas.

Question 5.
What is the difference between endangered species and vulnerable species?
Answer:
An endangered species is at the risk of extinction in near future, while a vulnerable species is at the risk of extinction in the middle term.

IV. Projects:

Question 1.
Find the name of national park or wildlife sanctuary in your state. Make a list of protected animal in this.
Answer:
Do it yourself

Question 2.
Make a project report about roles of WWF (World Wide Fund for Nature).
Answer:
Do it yourself