If the pollen grain is incompatible,the pisti | vedclass

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(D) The pollen-pistil interaction is a dynamic process involving pollen recognition followed by promotion or inhibition of the pollen. If the pollen g

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both $A$ and $B$

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(D) The pollen-pistil interaction is a dynamic process involving pollen recognition followed by promotion or inhibition of the pollen. If the pollen grain is incompatible (i.e.,from a different species or self-incompatible),the pistil rejects the pollen by preventing pollen germination on the stigma or by inhibiting the growth of the pollen tube in the style. Therefore,both $A$ and $B$ are correct mechanisms of rejection.

If the pollen grain is incompatible,the pistil...

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