Question

For self-pollination, flower must be
a. Unisexual
b. Bisexual
c. Monosexual
d. Asexual

Answer 1

Hint: Self-pollination is a phenomenon in which the pollen grain is transferred from the anther on one flower to the stigma of the same flower or to the stigma of another flower on the same plant.

Complete answer:
> Option A:
Unisexual flowers are the flowers that contain either male reproductive organs (anther) or female reproductive organs (pistil) only. They are also called incomplete flowers. They can only reproduce by cross pollination like papaya, watermelon.

> Option B:
Bisexual flowers are the flowers, which contains both male and female reproductive organs in one flower. These flowers can reproduce by self-pollination as the pollen and ovum are present nearby.

> Option C:
Monosexula flowers are also called incomplete flowers as they contain only male or female reproductive organs. So they are same as unisexual flowers.

> Option D:
Asexual reproduction is a method of reproduction in which new plants are produced without the help of flowers through non reproductive parts of the plant.

Hence, the correct answer is option (B), as it has both male and female parts required for the self-pollination.

Note: Cross pollination is defined as the transfer of pollen grains from the anther of one plant to the stigma of another flower present on a different plant of the same species. It requires the help of some external agent for the spread of the pollen grain like wind, water, animals, birds etc. Self-pollination reduces the variation in plant characters and also reduces biological fitness to its survival while cross pollination creates variation in the population of the same species.