In maize, pollination is

Identify the correct description about the given figure:

Advantage of cleistogamy 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

Pollen robbers

The type of pollination which brings genetically different types of pollen on the stigma is