Plants with ovaries having only one or a few ovules are generally pollinated by wind. Let's understand why.

Wind Pollination
Wind pollination, also known as anemophily, is a form of pollination whereby pollen is carried by wind to fertilize female reproductive organs of plants. Wind-pollinated plants usually have small and inconspicuous flowers that lack petals and nectar. These flowers produce large amounts of pollen that is lightweight, smooth, and often spherical.

Advantages of Wind Pollination
Wind pollination is advantageous to the plants in several ways:

1. Cost-Effective: Wind pollination is a cost-effective method of pollination because plants do not have to produce showy flowers, nectar, or attractants to attract pollinators.

2. Wide Pollination Range: Wind can carry pollen over long distances, increasing the chances of pollination.

3. No Dependency on Pollinators: Wind-pollinated plants do not depend on specific pollinators for reproduction and are less vulnerable to fluctuations in pollinator populations.

Examples of Wind-Pollinated Plants
Some common examples of wind-pollinated plants are:

- Grasses
- Trees like oak, birch, and pine
- Weeds like ragweed and nettle
- Cereals like wheat, rice, and corn

Conclusion
In conclusion, plants with ovaries having only one or a few ovules are generally pollinated by wind due to the advantages of cost-effectiveness, wide pollination range, and no dependency on pollinators.