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Which one of the following statements is correct?

1. Geitonogamy involves the pollen and stigma of flowers of different plants
2. Cleistogamous flowers are always autogamous
3. Xenogamy occurs only by wind pollination
4. Chasmogamous flowers do not open at all

Correct answer: Cleistogamous flowers are always autogamous

Solution

Cleistogamous flowers remain closed, so pollen cannot be transferred from another flower by external agents. Because the anthers and stigma are in the same unopened flower, self-pollination occurs automatically, making them autogamous.

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