It is a common characteristics of angiosperm in which both the male gametes take part in fertilization .
Female gametophyte stops its growth at eight nucleate stage further growth continues after double fertilization .
It helps in the formation of seed and fruit .
Their is recombination of maternal and paternal characters .
The PEN formed during triple fusion develops into primary endosperm cell and it provide nourishment to the developing embryo and also to the germinating seed .
It is necessary for the formation of viable seeds.
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