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What happens if the wrong type of pollen grain lands on the stigma?

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The pistil rejects the pollen by preventing pollen germination on the stigma or the pollen tube growth in the style.

The pistil does not have the ability to recognise the pollen, whether it is of the right type or of the wrong type.

The pistil accepts the pollen and promotes post-pollination events that leads to fertilisation.

The pistil accepts the pollen which after germination is rejected by the synergids present in the embryo sac.

answer is A.

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Detailed Solution

A continuous dialogue occurs between pollen grain and the pistil. This dialogue is mediated by chemical components of the pollen interacting with those of the pistil.

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