Autogamy and Geitonogamy do not occur in

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Castor

Maize

Commelina

Papaya

answer is D.

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Detailed Solution

Papaya is dioecious plant and hence does not show autogamy and geitonogamy but shows only xenogamy. Maize and Castor are monoecious plants which do not show autogamy but show both geitonogamy and xenogamy. Commelina has bisexual cleistogamous and chasmogamous flowers and show autogamy, geitonogamy and xenogamy.

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