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In angiosperm pollen tube is a ferilizin...

In angiosperm pollen tube is a ferilizing agent. How does the pollen tube gain its entry into the embryo sac of the ovule?

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The pollen tube grows through the tissues of stigma and style to reach the ovary. It enters the ovule through the micropyle and then enters the embryo sac through the filiform apparatus of one of the synergids.
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