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Biodiversity and Conservation

Long Answer Type

51. What kinds of threats to the biodiversity may lead to its loss ?

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Short Answer Type

52. Name the two basic methods of conservation of biodiversity..

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Long Answer Type

53. Explain the following :
(Ð°) IUCN Red List

(b) Protected areas.

(a) IUCN Red List. It is a catalogue of taxa that are facing the risk of extinction. The uses of red list are (i) developing awareness, about the threat of loss of biodiversity (ii) identification and documentation of endangered species (iii) providing a global index of the decline of biodiversity (iv) defining conservation.

IUCN has recognized eight red list categories of species. They are :

(i) Extinct (ii) Extinct in wild (iii) Critically endangered (iv) Endangered (v) Vulnerable (vi) Lower risk (vii) Data deficient and (viii) Not evaluated.

The 2000 red list contains assessment of more than 18,000 species, 11,000 of which are threatened.

(b) Protected areas. These areas are areas of land or sea that are dedicated to the protection and maintenance of biological diversity. They include National Parks, Sanctuaries and Biosphere reserve. India has 14 biosphere reserves, 90 national parks and 448 wildlife sanctuaries

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One Word Answers

54. What is the total number of hotspots in the world?

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Short Answer Type

55.

Using a chart show the in situ and ex situ approaches of conserving biodiversity in India.

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56. How can we preserve threatened species of plants..

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57. Write critical notes on the following :

(i) Hot spots of biodiversity

(ii) Ex situ conservation

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58.

Give three hypotheses for explaining why tropics show greatest levels of species richness.

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59. Amazonian rain forest has the greatest biodiversity on earth. List any two hypotheses that are proposed by the biologists to account for the greater biological diversity.

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