Cleistogamy is autogamous pollinatin. When pollination and fertilization occur in unopened flower bud, it is known as cleistogamy. It ensures self-pollination and prevents cross-pollination.

Autogamous Pollination

Autogamy is a type of self-pollination in which the transfer of pollen grains occurs within the same flower or between flowers of the same plant. This mode of pollination is also called self-fertilization. In autogamous pollination, the male and female reproductive organs are located close to each other, making it easier for the pollen to reach the stigma.

Cleistogamy

Cleistogamy is a type of autogamous pollination in which the flowers remain closed and do not open. The pollination occurs within the flower, and the fertilized ovules develop without any external intervention. The closed flowers ensure that the pollen grains are transferred from the anthers to the stigma, without being exposed to the external environment.

Geitonogamy

Geitonogamy is a type of pollination in which the pollen grains are transferred from the anthers of one flower to the stigma of another flower on the same plant. This mode of pollination is also called intra-plant pollination, as the pollination occurs between flowers of the same plant. Although geitonogamy is not strictly autogamous, it is still considered a form of self-pollination.

Xenogamy

Xenogamy is a type of cross-pollination in which the pollen grains are transferred from the anthers of one flower to the stigma of another flower on a different plant. This mode of pollination ensures genetic diversity and is essential for the survival of many plant species.

Chasmogamy

Chasmogamy is a type of pollination in which the flowers are open and visible, and the pollination occurs through the transfer of pollen grains from the anthers to the stigma. This mode of pollination is also called open pollination, and it occurs through various agents such as wind, insects, birds, and animals.

Conclusion

In conclusion, autogamy is a type of self-pollination in which the transfer of pollen grains occurs within the same flower or between flowers of the same plant. Cleistogamy is a type of autogamous pollination in which the flowers remain closed and do not open, making it easier for the pollen to reach the stigma. Therefore, option A, Cleistogamy, is the correct answer.

A. is a write ans because in cleistogamus flower they don't open there petals and hence it results into autogamy pollination