Sperm and egg nuclei fuse due to:
Correct answer: D. Attraction of their protoplasts
- 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
Explanation
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.
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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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