Pollination is best defined as

What is indicated by $'A'$ and $'B'$ in the given diagram?

Choose correct sentence for pollination.

$(I)$ Majority of flowering plants use a range of animals as pollinating agents.

$(II)$ Among the animals, insects particularly flies are the dominant biotic pollinating agents.

$(III)$ Majority of insect pollinating flowers are small and less colorful.

$(IV)$ The body of the animal gets a coating of pollen grains, which are generally sticky in animal pollinated flowers.

Sperm cells of angiosperms differ from the rest of the plant groups like gymnosperms by

The mature stigma is either rough or sticky in

Plants with ovaries having only one or a few ovules, are generally pollinated by