Question

For which of the following flowers, complete autogamy is rather rare

• A.
  Cleistogamous
• B.
  Both $a$ and $c$
• C.
  Chasmogamous
• D.
  That do not open at all

Answer 1

The correct option is C

Chasmogamous
Autogamy
Autogamy is a type of pollination in which pollen grains are transferred from the anther to the stigma of the same flower in a plant.

Cleistogamous flowers
Cleistogamous flowers are the type of flowers which are closed so that the anthers and stigmas are not exposed to the outer environment. Since these flowers do not open at all, cross-pollination cannot occur in such flowers. There is only the possibility of self-pollination, hence, these flowers exhibit autogamy.

Chasmogamous flower
Chasmogamous flower is a type of flower that opens and exposes anthers and stigma to the outer environment.

Autogamy in chasmogamous flower
In chasmogamous flowers, complete autogamy is rather rare. Because the flowers of these have exposed anthers and stigmas, hence, there is a possibility of cross-pollination too. Thus, chasmogamous flowers mostly receive pollen from other flowers in the same plant or different plants of the same species.