Unisexuality of flowers prevents:
Correct answer: B. Autogamy and Geitonogamy
- A. Geitonogamy, but not Xenogamy
- B. Autogamy and Geitonogamy
- C. Autogamy, but not Geitonogamy
- D. Both Geitonogamy and Xenogamy
Explanation
Unisexuality of flowers prevents autogamy (self-pollination) and geitonogamy (pollination between flowers of the same plant), as both require the presence of both male and female reproductive parts in a single flower. In unisexual flowers, either male or female reproductive organs are present, making it impossible for the flower to self-pollinate or for flowers on the same plant to cross-pollinate. This promotes outcrossing (xenogamy) by requiring pollination between flowers on different plants.
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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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