Assertion (A): In regions with less than 70 cm of rainfall, the natural vegetation consists of thorny trees and bushes.

Reason (R): Leaves are mostly thick and small to maximise evaporation.

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Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true and but (R) is the correct explanation of (A).

(A) is correct but (R) is wrong.

(A) is wrong but (R) is correct.

answer is A.

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Detailed Solution

In regions with less than 70 cm of rainfall, the natural vegetation consists of thorny trees and bushes. This kind of vegetation can be found in the semi-arid regions of Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Uttar Pradesh, and Haryana in the country's northwest. The predominant plant species are cactus, euphorbias, acacias, and palms. There are many trees, and their extensive roots reach far into the ground to obtain moisture. Because the stems are succulent, water is saved. To reduce evaporation, leaves are typically thick and tiny in size. In drier regions, these woods give way to thorn forests and scrubs. Therefore, both (A) and (R) are true, and (R) is the correct explanation of (A).

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