In papaya,male and female flowers are present on different plants. This condition permits:

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.

In which of the following are both autogamy and geitonogamy prevented?

Cross-fertilisation is favoured by

Which of the following devices promote cross-pollination?
$(i)$ Non-synchronization of pollen release and stigma receptivity
$(ii)$ Anther and stigma are placed at different positions
$(iii)$ Monoecious plants
$(iv)$ Production of dioecious plants
$(v)$ Self-incompatibility
$(vi)$ Anther and stigma are placed close to each other
$(vii)$ Self-compatibility

Which one of the following favours herkogamy for cross-pollination?