Xenogamy or cross-pollination is performed by

$I$. Abiotic agencies

$II$. Biotic agencies

$III$. Insects only

Select the correct option for the given question

In plants, in nature, autogamy is avoided since the seeds produced

Self-incompatibility is a device for

$I$. Ensuring cross-pollination

$II$. Preventing self-pollination

$III$. Ensuring self-fertilisation

$IV$. Genetic control for self-fertilisation

Choose the correct statements from those given above

Assertion : Insects visit flower to gather honey.
Reason : Attraction of flowers prevents the insects from damaging other parts of the plant.

Sperm cells of angiosperms differ from the rest of the plant groups like gymnosperms by

Mention about agents of pollination and explain pollination by wind.