Question

explain the process of germination of pollen on stigma of a flower

Answer 1

During germination, the tube cell elongates into a pollen tube. In the flower, the pollen tube then grows towards the ovule where it discharges the sperm produced in the pollen grain for fertilization. The germinated pollen grain with its two sperm cells is the mature male microgametophyte of these plants.

Answer 2

On the stigma, the pollen grains absorb water and nutrients and produce a tiny pollen tube that passes through the style and reaches the ovary. Then enlargement of the tube cell occurs which comes out of the pollen grain through a germ pore to form the pollen tube. The tube nucleus comes to the tip of the pollen tube.

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Explanation:

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