Question

Why are cleistogamous flowers invariably autogamous?

Answer 1

The pollination that occurs in opened flowers is called chasmogamy. It is the most common type of pollination in all types of flowers. ... Thus, these flowers are invariably autogamous as there is no chance of cross-pollen landing on the stigma.


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Answer 2

Cleistogamous flowers are those that do not open at all and only autogamy occurs. This is because there is possibility of cross pollination because these flowers do not open at all and pollen from other plants cannot land on the stigma of these flowers.“Cleistogamous flowers are invariably autogamous because”
(a) These flowers do not open at all.
(b) There is no chance of cross – pollen landing on the stigma.
(c) These flowers have exposed anthers and stigma.
(d) These flowers are wind pollinated. 
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