Which type of pollination takes place in a flower with ovaries having only one or a few ovules ?

Wind pollination.

The correct answer is wind pollination.

Flowers with ovaries having only one or a few ovules are typically pollinated by wind. This is because wind is a very efficient way to transport pollen over long distances, and it is not as selective as insects or other pollinators.

Wind pollinated flowers are typically small and inconspicuous, and they do not produce a lot of nectar or other rewards for pollinators. They also have dry pollen that is easily blown by the wind.

Some examples of wind pollinated plants include grasses, corn, and wheat.

The other types of pollination, namely bird pollination, water pollination, and insect pollination, typically occur in flowers that have multiple ovules. This is because these types of pollination require a more targeted delivery of pollen to the ovules.