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

$A$ dioecious flowering plant prevents both

Which of the following mechanisms prevents self-pollination?

Does self-incompatibility impose any restrictions on autogamy? Give reasons and suggest the method of pollination in such plants.

The maturation of male (anthers) and female (stigma) reproductive structures at different times in the same flower (in order to reduce the possibility of self-pollination) is called:

When the pollen grains are not transferred from anthers to the stigma in a flower due to a physical barrier or fence,or when some natural barrier exists between the androecium and gynoecium to check self-pollination,it is known as: