What are cleistogamous flowers? Write their significance.

Explanation

(a) The flowers which do not open at all are known as cleistogamous flowers. In such flowers the anthers and stigma lie close to each other. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma to affect pollination.
(b) Cleistogamous flowers produce assured seed-set even in the absence of pollinators.