Which one of the following is surrounded by a callose wall?
Correct answer: C. Pollen grain
- A. Male gamete
- B. Egg
- C. Pollen grain
- D. Microspore mother cell
Explanation
A pollen grain is surrounded by a callose wall during its development. This callose wall helps protect the pollen grain as it matures and is involved in the release of pollen upon reaching the stigma of the female flower.
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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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