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Double fertilization is fusion of

1. two eggs
2. two eggs and polar nuclei with pollen nuclei
3. one male gamete with egg and other with synergid
4. one male gamete with egg and other with secondary nucleus

Correct answer: one male gamete with egg and other with secondary nucleus

Solution

In double fertilization, one male gamete fuses with the egg to form the zygote, and the other fuses with the secondary nucleus in the central cell to form the endosperm. This is a characteristic feature of flowering plants.

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