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71.
Beta diversity is diversity

in a community

between communities

in a mountain gradient

on a plain

between communities

Community and ecosystem diversity is of three types $α$ , $β$ and $γ$ . $β$ -diversity (between community diversity) is a biodiversity which appears in a range of communities due to replacement of species with the change in community habitat due to presence of different microhabitats, niches and difference in environmental conditions.

72.

Which one of the following pairs of geographical areas show maximum biodiversity in our country?

Sunderbans and Rann of Kutch
Eastern Ghats and West Bengal
Eastern Himalaya and Western Ghats
Kerala and Punjab

73.

One of the ex situ conservation methods for endangered species is

wildlife sanctuaries
biosphere reserves
cryopreservation
national parks

74.

Keystone species deserve protection because these

are capable of surviving in harsh environmental conditions
indicate presence of certain minerals in the soil
have become rare clue to overexploitation
play an important role in supporting other species.

75.

Biosphere reserves differ from National Parks and Wildlife sanctuaries because in the former

human beings are not allowed to enter
people are an integral part of the system
plants are paid greater attention than the animals
living organisms are brought from all over the world and preserved for posterity.

76.

The Great Barrier Reef along the east coast of Australia can be categorised as

population
community
ecosystem
biome.

77.

Which one of the following is a pair of endangered species

Garden lizard and Mexican poppy
Rhesus monkey and Sal tree
Indian peacock and carrot grass
Hornbill and Indian aconite

78.

Assertion: Red algae contribute in producing coral reefs.

Reason: Some red algae secrete and deposit calcium carbonate over their walls.

If both Assertion and Reason are true and Reason is the correct explanation of Assertion
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false.