Question

Contrivance for self-pollination is

• A. Bisexuality
• B. Homogamy
• C. Cleistogamy
• D. All of the above

Answer 1

The correct option is D All of the above

Contrivance for self-pollination

Most of the flowers are pollinated by cross-pollination.

However, some flowers have certain mechanisms which prevent cross-pollination and favours self-pollination.

Such devices are called contrivances for self-pollination.

Contrivance for self-pollination are as follows:

1) Cleistogamy
2) Bisexuality
3) Homogamy

Cleistogamy

Cleistogamy is the process of self-pollination in flowers that do not open and the male and female reproductive parts remain unexposed.

Thus flowers are not dependent on pollinators and self-pollinate themselves as the pollen grains are transferred from the anther to the stigma of the same flower (autogamy).

Bisexuality

Bisexuality in a flower refer to the presence of both male and female reproductive plant parts in it.

Self-pollination or autogamy to be precise is possible only in bisexual flowers.

Bisexuality ensure self-pollination in most flowers.

Homogamy

Homogamy refers to the event of the male and female reproductive parts maturing simultaneously.

Homogamy is essential to ensure self-pollination such that the release of pollen and the receptivity of the stigma are synchronised.

Final answer

(D) All of the above