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Double fertilisation leading to initiation of endosperm in Angiosperms require

1. fusion of one polar nucleus and the second male gamete only
2. fusion of two polar nuclei and the second male gamete only
3. fusion of four or more polar nuclei and the second male gamete only
4. all the above kinds of fusion in different angiosperms

Correct answer: fusion of two polar nuclei and the second male gamete only

Solution

In angiosperms, double fertilisation includes syngamy and triple fusion. Endosperm initiation typically occurs when the second male gamete fuses with the central cell containing two polar nuclei, forming the primary endosperm nucleus. This is the standard case described in most flowering plants.

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