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Q.

Choose the incorrect statement with respect to microspores or pollen grains of flowering plants. 

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a

Vegetative cell nucleus is spherical in shape. 

b

Generative cell floats in the cytoplasm of vegetative cell.  

c

In more than 60% of angiosperms, the pollen grains are released at 2-celled stage.  

d

Exine is made of one of the most resistant organic materials known so far.

answer is A.

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Detailed Solution

Vegetative nucleus of pollen grain is irregularly shaped. In less than 40% of angiosperms, the pollen grains are released at 3-celled stage (2 male gametes and one vegetative cell).

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Choose the incorrect statement with respect to microspores or pollen grains of flowering plants.