Sperm and egg nuclei fuse due to

A. Base pairing of their DNA and RNA

B. Formation of hydrogen bonds

C. Mutual attraction due to differences in electrical charges

D. Attraction of their protoplasts

Answer: Option D

Solution(By Examveda Team)

Sperm and egg nuclei fuse due to attraction of their protoplasts.
The two gametes i.e., sperm released by pollen tube and egg move in opposite direction by an unknown mechanism but most probably by streaming currents of cytoplasm i.e., due to attraction of their protoplasts.
The nucleus of one male gamete fuses with the egg nucleus and the phenomenon is called fertilization.