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(A) The process of pollen-pistil interaction involves a chemical dialogue between the pollen grain and the pistil. The $Stigma$ of the flower acts as

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Stigma

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(A) The process of pollen-pistil interaction involves a chemical dialogue between the pollen grain and the pistil. The $Stigma$ of the flower acts as the landing platform for pollen grains. It possesses the ability to recognize the pollen grain, specifically whether it is of the right type (compatible) or the wrong type (incompatible). If the pollen is compatible, the $Stigma$ accepts it and promotes post-pollination events like pollen tube germination. Therefore, the correct answer is $A$.

Which part of the flower has the ability to recognize the pollen grain?

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