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GS Geography Physical Geography of World
Q.

As one moves from the polar region towards equator the diversity of plant and animal species  .
Explanation:

ANS. (A) 
As a rule, biodiversity decreases from the equator towards the poles. Typically, equatorial regions have warmer climates and direct insolation that allows for more producers which provide food for the many food chains operating in the equatorial biomes. Therefore, there are greater numbers of species found in equatorial regions as compared to the poles.

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