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  4. Double fertilization (or triple fusion) leading to initiation of endosperm in angiosperms, requires

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Q. Double fertilization (or triple fusion) leading to initiation of endosperm in angiosperms, requires

AFMCAFMC 2007Sexual Reproduction in Flowering Plants

Solution:

Nawaschin $(1898)$ was first to show that both the male gametes released by a pollen tube are involved in fertilization. Nucleus of one gamete fuses with egg nucleus (syngamy). Nucleus of the other gamete fuses with the polar nuclei or their fusion product (secondary nucleus). Most of the plants have two polar nuclei; hence second fertilization involves the fusion of three nuclei (triple fusion).
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