Question

Cleistogamous flowers are invariably autogamous because

• A. These flowers do not open at all.
• B. There is no chance of cross-pollen.
• C. These flowers have exposed anthers and stigma.
• D. These flowers are wind pollinated.

Answer 1

The correct option is A These flowers do not open at all.

Cleistogamous flowers mean anther and stigma lie close each other in the closed flower. They are bisexual which cannot open even at maturity and thus self-pollination occurs. As they are closed consider as invariable autogamous.

Thus, the correct answer is A.