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Dear student,

The movement of pollen grains from a male flower to the stigma of the female flower of the same plant is called geitonogamy. Thus, geitonogamy only works in monoecious plants, i.e. the plants having male and female flowers in different places.

Thus, it does not occur in the bisexual flower.

Xenogamy is not seen only in dioecious plants, it is also possible in monoecious plants.

In cleistogamous flowers, only self-pollination is possible because they never open. Thus, cross-pollination cannot occur in cleistogamous flowers.

Therefore, option number 2, i.e., (a) and (b) only, is correct to choose.


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