Question

The phenomenon of nuclear fusion of sperm and egg is known as:

• A. Parthenogenesis
• B. Oogenesis
• C. Karyogamy
• D. Vitellogenesis

Answer 1

The correct option is C

Karyogamy

The correct answer is option C.

Explanation of the correct option:

1. The fusion of two haploid nuclei is known as karyogamy.
2. Plasmogamy occurs before karyogamy when the cell membrane and cytoplasm of two cells unite.
3. Pronuclei are the nuclei found inside the connected cell membrane.
4. The zygote is formed when the cell membrane, cytoplasm, and pronuclei fuse together to produce a diploid cell.

Explanation of the incorrect options:

Option A:

Parthenogenesis is a type of reproduction in which an egg develops into an embryo without the need for sperm to fertilize it.

Option B:

It is a type of gametogenesis in which ova (female gametes), are created and the resulting female gamete is called an ovum.

Option C:

The process of vitellogenesis is the formation and accumulation of the yolk in the ovum.

Final answer: The phenomenon of nuclear fusion of sperm and egg is known as karyogamy.