Q.

Approximate diameter of pollen grain is

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a

25 – 50 micrometer

b

50 – 75 micrometer

c

75 – 100 micrometer

d

25 – 35 micrometer 

answer is A.

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Detailed Solution

Pollen grains are generally 25 – 50 micrometer in diameter. Pollen grains have two main layers (i) Outer layer -  it is also called exine. It is made up of sporopollenin.  It is hard and protective in nature due to sporopollenin. Pollen can withstand extreme temperatures. (ii) Inner layer -  it is also called intine. It is made up of cellulose and pectin. It is very thin as compared to the outer layer.

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