Question

Which one of the following statements is correct?

• A. Cleistogamous flowers are always autogamous.
• B. Xenogamy occurs only by wind pollination.
• C. Chasmogamous flowers do not open at all.
• D. Geitonogamy involves the pollen and stigma of flowers of different plants.

Answer 1

Answer: (A)

In cleistogamy, as the flowers never open so there is no alternative of self pollination. It is invariably autogamous. In xenogamy, pollination takes between two flowers of different plants (genetically and ecologically). Chasmogamy occurs when the flowers expose their mature anther and stigma to the pollinating agents. Geitonogamy is the pollination taking place between the two flowers of the same plant or genetically similar plant. Genetically, it is self pollination but as the agency is involved it is ecologically cross pollination.