Double fertilisation is

Fusion of two male gametes with one egg

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Fusion of one male gamete with two polar nuclei

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Fusion of two male gametes with two different eggs

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Syngamy and triple fusion

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Solution

The correct option is D Syngamy and triple fusion
Double fertilization involves two sperm cells; one fertilizes the egg cell to form the zygote. This process is called syngamy.
The other sperm fuses with the two polar nuclei. Since this process involves the fusion of three haploid nuclei, it is known as triple fusion. It results in the formation of the endosperm.

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