In gymnosperms male gametophyte consists of:
Correct answer: C. Pollen grain
- A. Archegonia
- B. Megaspore mother cell
- C. Pollen grain
- D. Ovule
Explanation
In gymnosperms, the male gametophyte consists of a pollen grain. The pollen grain is a multicellular structure that develops from a microspore, which is produced within the microsporangia of the male cones (pollen cones or microstrobili) of gymnosperm plants. Within the pollen grain, there are typically two cells: a generative cell and a tube cell. The generative cell undergoes mitosis to produce two sperm cells, while the tube cell forms the pollen tube, which facilitates the transport of sperm cells to the female reproductive structures for 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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