Write the changes seen in the stigma and the pollen grains during pollination.
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Once a pollen grain has implanted on a compatible stigma via self-incompatibility mechanisms, the germination process is initiated. During this process, the pollen grain undergoes a conformational change whereupon a given section begins to protrude outwards to form a tube-like structure, known as the pollen tube.
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stigma make it surface sticky for. pollen to stick on it
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