Geitonogamy is

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

The pollens are released in large numbers to ensure

Long silky hairs on cob of maize are

Cheiropterophily is the process of pollination by