Approximate diameter of pollen grain is

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(A) Pollen grains are generally $25-50 \mu m$ in diameter.Pollen grains have two main layers:$(i)$ Outer Layer: It is also called exine. It is made up

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$25-50 \mu m$

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(A) Pollen grains are generally $25-50 \mu m$ 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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