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a
Autogamy can be prevented but not geitonogamy.
b
Both autogamy and geitonogamy can be prevented.
c
Only xenogamy occurs.
d
Geitonogamy and xenogamy is prevented.
answer is A.
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Detailed Solution
Maize is a monoecious plant ,i.e, staminate and pistillate flowers are present on the same plant. Therefore, Autogamy is prevented as the flowers are unisexual but geitonogamy cannot be prevented.