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Solution


Q.

A dioecious flowering plant prevents both                                       [2017]
1 autogamy and geitonogamy  
2 geitonogamy and xenogamy  
3 cleistogamy and xenogamy  
4 autogamy and xenogamy  

Ans.

(1)

Dioecious plants are those plants in which male flowers and female flowers are borne on different plants. Therefore, they prevent both autogamy and geitonogamy.