Question

In castor and maize plants

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

Answer 1

The correct option is A autogamy is prevented but not geitonogamy

Castor and maize are monoecious, which means both male and female flowers are present on the same plant and this prevents autogamy but not geitonogamy.
Autogamy is self-fertilisation.
Geitonogamy - Transfer of pollen grains from the anther to the stigma of another flower of the same plant.