Pollen tube after reaching the ovary generally enters the ovule through the

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integument

micropyle

nucleus

chalaza

answer is D.

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Detailed Solution

Pollen tube, after reaching the ovary, enters the ovule through the micropyle and then enters one of the synergids through the filiform apparatus. Many recent studies have shown that filiform apparatus present at the micropylar part of the synergids guides the entry of pollen tube.

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