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How does endosperm of angiosperms become...

How does endosperm of angiosperms become triploid ?

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Endorperm in Angiosperm is formed as a result of triple fusion or vegetative fertilisation. It invovles fusion of male gamete with 2 haploid polar nuclei, forming triploid PEN present in Primary Enderperm Cell (PEC). This later with repeated division form multicellular, triploid nutritive tissue called endosperm.
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Choose the correct answer : The endosperm in angiosperm develops from :

Double fertilization leading to initiation of endosperm in angiosperms, requires

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