in Plant Reproduction by

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Micropyle before fertilisation Helps in the entry if pollen tube into the female gametophyte (REASON- as on the micropyle end synergids are there having filliform appratus that guide the entry of pollen tube

Micropyle after fertilisation remain as a pore at the seed (as ovule{female gametophyte} changes into seed after fertilisation) that helps in exchange of air and water 

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