The type of pollination that occurs within a single flower is known as:

Choose the correct statements regarding pollination:
$(I)$ Majority of flowering plants use a range of animals as pollinating agents.
$(II)$ Among the animals, insects, particularly bees, are the dominant biotic pollinating agents.
$(III)$ Majority of insect-pollinated flowers are large, colourful, fragrant, and rich in nectar.
$(IV)$ The body of the animal gets a coating of pollen grains, which are generally sticky in animal-pollinated flowers.

The $"Trap door mechanism"$ in pollination is observed in:

Which is the most dominant pollinator among animals?

Which is functionally cross-pollination involving a pollination agent,but genetically it is similar to autogamy?

What is required for self-pollination (autogamy)?