Question

20. What do you mean by migration of animals.
a) When due to deforestation wild animals come to houses of local people.
b) When our domestic animals go to forest for living.
c) When due to change of habitat some birds at a particular time travel large
distances after every year.
d) When due to fear some birds change their natural habitat.
21. What is desertification of soil?
a) Depletion of upper layer of soil due to erosion
b) Wearing away of field's topsoil by natural force like wind
c) Decreasing fertility of soil due to the deficiency of manure
d) None of these
22. Which of the following book keep the record of endangered species?
a) Blue data book b) Green data book c) Red data book d) Yellow data book
23. What are aims of establishing wild life sanctuaries and national parks?
a) It provides best condition for protection and survival of wild life.
b) In this special area hunting of wild life is strictly prohibited.
c) In this area endangered species of wild life live with full protection.
d) All of the above.
24. What do you mean by drought?
a) There is a lot of thunderstorm
b) Lesser rain due to cutting of large no of trees
c) Imbalance of water cycle due to increasing temperature of earth.
d) Both b and c
25. Give any two examples of migratory birds.
a) Bat and owl
b) Flying squirrel and giant squirrel
c) Greater flamingo and Siberian cranes d) All of these​

Answer 1

Answer:

20.(d)

24 .(d)

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