Which one of the following is an example of cleistogamy?

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Sunflower

Vallisneria

Viola

Calotropis

answer is C.

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Detailed Solution

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 and stigma, and cleistogamous flowers which do not open at all.

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