How do cleistogamous flowers ensure pollination?

Step-by-step solution

Autogamy: In this type, pollination is achieved within the same flower. Transfer of pollen grains from the anther to the stigma of the same flower Autogamy in such flowers requires synchrony in pollen release and stigma receptivity and also, the anthers and the stigma should. lie close to each other so that self-pollination can occur. Some plants such as Viola (common pansy), Oxalis, and Commelina produce two types of flowers – chasmogamous flowers which are similar to flowers of other species with exposed anthers