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Unisexuality of flowers prevents

1. autogamy, but not geitonogamy
2. both geitonogamy and xenogamy
3. geitonogamy, but not xenogamy
4. autogamy and geitonogamy

Correct answer: autogamy and geitonogamy

Solution

Unisexual flowers have either stamens or carpels, not both. So pollen cannot fertilize the same flower (autogamy), and flowers on the same plant cannot exchange pollen as geitonogamy requires separate male and female flowers on one plant; only xenogamy remains possible.

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