(B) In castor and maize plants,both male and female flowers are present on the same plant (monoecious condition).Since the flowers are unisexual,self-

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autogamy is prevented but not geitonogamy

(B) In castor and maize plants,both male and female flowers are present on the same plant (monoecious condition).Since the flowers are unisexual,self-pollination within the same flower (autogamy) is prevented.However,pollen grains can be transferred from the anther of one flower to the stigma of another flower on the same plant,which is known as geitonogamy.Therefore,autogamy is prevented but geitonogamy is not.

Class 12 Biology Sexual Reproduction in Flowering Plants Mix Examples-Sexual Reproduction in Flowering Plants

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In castor and maize plants, . . . . . .

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A
male and female flowers are borne by different plants
B
autogamy is prevented but not geitonogamy
C
the anthers and stigma are placed at different positions to encourage cross pollination
D
both autogamy and geitonogamy are prevented