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In plants with chasmogamous bisexual flowers, autogamy or self pollination, geitonogamy or intra-plant pollination and xenogamy or interplant pollinations can be carried out.In papaya, only xenogamy is possible as the plant is dioecious. Common pansy (Viola) has cleistogamous flowers which invariably show autogamy. Most of the flowering plants form bisexual flowers.