There are two types of flowers present in plants namely Oxalis and Viola − chasmogamous and cleistogamous flowers. Chasmogamous flowers have exposed anthers and stigmata similar to the flowers of other species.
Cross-pollination cannot occur in cleistogamous flowers. This is because cleistogamous flowers never open at all. Also, the anther and the stigma lie close to each other in these flowers. Hence, only self-pollination is possible in these flowers.
What is menstrual cycle? Which hormones regulate menstrual cycle?
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simply it can be said that chasmogamous flowerrequire pollinator and clestogamous it does not require pollinator bcoz it is closed flower
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