2 answers:
<h2>BIOLOGY</h2>
A dioecious flowering plant prevents both
a) Autogamy and geitonogamy
b) Autogamy and xenogamy
c) Geitonogamy and xenogamy
d) Cleistogamy and xenogamy
- When uniséxual male and female flowers are present on different plants the condition is called dioecious and it prevents both autogamy and geitonogamy
#BRAINLYEVERYDAY
Explanation:

A dioecious flowering plant prevents both -
c) geitonogamy and xenogamy
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