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B
Isogamy
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C
Oogamy
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D
Syngamy
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Solution
The correct option is D Syngamy The process of fusion between a haploid male nucleus and an egg nucleus is known as amphimixis. It is also known as syngamy or fertilization which leads to formation of a diploid zygote. It leads to the recombination of character which causes variation. It is a mode of sexual reproduction.
A single sperm fuses with the ova and releases its nuclei and cellular contents in the ovum. The condition when the multiple sperm fuses with a single ovum is known as polyspermy.