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Pistil of a flower does not accept pollen from any plant other than from its own kind. How does it happen? Explain.

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Pistil of a flower does not accept pollen from any plant other than from its own kind. How does it happen? Explain.

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The pistil has the ability to recognise pollen, whether it is of right type (compatible) or of the wrong type (incompatible). It is mediated by chemical components of the pollen interacting with those of the pistil.

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