(c) Plants use two abiotic (wind and water) and one biotic (animals) agent to achieve
pollination. Majority of plants use biotic agents for pollination.
Pollination by wind is more common amongst abiotic pollination. Wind pollination requires the light and non-sticky pollen grains so that, they can be transported in wind
currents.
They often possess well-exposed stamens (so that the pollens are easily dispersed into wind currents) and large often-feathery stigma to easily trap air-borne pollen grains. Wind pollination is common in grasses.
These types of pollens are not pollinated by means of other three options

(i) Pollination by water (hydrophily) is quite rare in flowering plants but access in aquatic plants.

(ii) Zoophihyis pollination through the agency of animals.

(iii) Entomophily is the most common type of zoophily through the agency of insects.