Question

describe the two phenomena which can prevent both autogamy and gaetonogamy and ensure xenogamy in flowering plants

Answer 1

Dear Student,

Herkogamy, prevents both and ensures xenogamy. Herkogamy is where the anther and stigma are spatially separated.
Self- sterility, is another process, where the stigma resists to accept the self pollen and promotes xenogamy.

Regards