A) autogamy, but not geitonogamy
B) both geitonogamy and xenogamy
C) geitonogamy, but not xenogamy
D) autogamy and geitonogamy
Correct Answer: A
Solution :
[a] Unisexuality of flowers prevents autogamy, but not geitonogamy. In self-fertilization the male and female gametes are derived from the same individual. Among plants, self-fertilization also called autogamy is common in many cultivated species, e.g., wheat and oats. However, self-fertilization is a form of inbreeding and does not allow for the mixing of genetic material; if it occurs over a number of generations it will result in offspring being less vigorous and productive than those resulting from cross fertilization.
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