Question

explain what happens when pollen grains stick in stigma

Answer 1

Only after pollination, when pollen haslanded on the stigma of a suitable flower of the same species, can a chain of events happen that ends in the making of seeds. A pollen grain on the stigma grows a tiny tube, all the way down the style to the ovary.

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Answer 2

when pollen grains stick in stigma,it travels through the style and reach the ovary where it is fertilized with ovule to form a zygote