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Select the correct set of statements wit...

Select the correct set of statements with respect to biodiversity .
a. Diversity increases from lower to higher latitude .
b. The most important cause of "The Evil Quarter " is habitat loss.
c. The IUCN Red list documents the extinction of 87 plants species .
d. Indigenous plants of aquatic habitat are eliminated by exotic species Clarias.

A

b & c

B

a & d

C

a & c

D

c & d

Text Solution

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The correct Answer is:
A
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Select the correct option. Cause (s) of species extinction is/are : a. Introduction of exotic species b. Habitat destruction c. Overexploitation

Consider the following statements with respect to patterns of biodiversity . A. With very few exceptions, tropics (Iatitudinal range of 23.5^(@)N to 23.5^(@) S ) harbour more species than temperate or polar areas. B. In general, species diversity increases as we move away from the equator towards the poles . C. The diversity of plants and animals is uniform throghout the world but shows a rather even distribution . D. The largely tropical Amazonian rain forest in South America has the greatest biodiversity on earth. Of the above statements :

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The figure below depicts life-histroy strategies for three plant species (a,b and c) along 3 axes : strength of competition with other organisms, level of distrubance in the habitat, and level of environmental stress in the habitat. Species a grows in habitats where competition among species b grown in habitats with and stress are low. Species b grows in habitats with high environmental stress but with low interspecies competition. Species c grows in highly disturbed habitats with low enviornmental stress. Which of the statements below is/are correct ? I. Characteristics of "a-type" plants are faster growth rate and short-lived leaves. II. Desert annual plants are "b-type" species. they have rapid growth and produce large amount of seeds in a short time after rains. III. Most plants belonging to "c-type" species would be herbaceous while "a-type" and "b-types" species are likely to be trees or shrubs.

Mark true or false in the following statements. (i) Habitat loss and fragmentation is the most important cause driving animals and plants to extinction. (ii) Steller's sea cow has been extinct due to habitat loss. (iii) When alien species are introduced deliberated or unintentionally for whatever purpose, some of them turn invasive and cause extinction of indigenous species. (iv) When a host fish species becomes extinct its unique assemblage of parasites also meets the same fate.

Consider the following six statements (a-e) about causes of biodiversity losses. a. Tropical rain forests once covering more than 14% of the earth's land surface, these forests now cover no more than 0.6%. b. Biological system should not be exploited beyond the degree of their renewability. c. Nile perch, a large predator fish was introduced into Lake Victoria of East Australia. d. Lantana is an indigenous plant of our country. e. Recent illegal introduction of the American catfish for aquaculture purpose is posing a threat to the indigenous catfishes in our rivers. Which of the above statement(s) is/are correct?

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