Which of the following is regarded as best contrivances for self pollination?

Options

A. Homogamy
B. Cleistogamy
C. Pollen prepotency
D. Dicliny

Answer

To determine which of the following options is regarded as the best contrivance for self-pollination, we will analyze each option provided:

1. **Homogamy**: This term refers to a condition where all flowers on a plant are of the same sex, meaning they are either all male or all female. Since homogamy does not facilitate self-pollination (as it lacks both male and female reproductive parts in the same flower), this option is not suitable for self-pollination.

2. **Clistogamy**: This is a condition where the flowers are permanently closed, which means they do not open to the outside environment. In clistogamous flowers, self-pollination occurs because the male and female reproductive parts are in close proximity, and there is no need for external pollinators. This makes clistogamy the best contrivance for self-pollination.

3. **Pollen Prepotency**: This term describes a condition where the male and female reproductive parts are present in different plants, leading to cross-pollination rather than self-pollination. Therefore, this option is also not suitable for self-pollination.

Based on the analysis above, the correct answer is **Clistogamy**, as it is the best contrivance for self-pollination.