Question

What are the contrivances of self-pollination?

Answer 1

Self-pollination:

1. Involves transfer of pollen grains from anthers to the stigma of the same flower or another flower that is on the same plant.
2. It takes place in bisexual flowers or unisexual flowers on the same plant.
3. It is of two types- autogamy and geitonogamy.

Bisexuality:

1. Has both male and female flowers.
2. It is called a perfect flower as it has both stamens and carpels.

Homogamy:

1. The stamens and stigma of the flower mature at the same time.
2. They are brought together closer by growth, bending, or folding.
3. Examples of plants are potatoes, wheat, and rice.

Cleistogamy:

1. The anthers mature and burst liberating the pollen grains in a closed flower.
2. Two types of flowers are there-cleistogamous(underground flowers) and chasmogamous(aerial flowers).
3. Underground flowers are small, colorless, and odorless.
4. They do not have nectar as they don't need to attract insects for pollination.
5. Aerial flowers are larger, brightly colored, and have nectar.