Pollination is not carried out by water in -

The correct answer is Option (2) → Water lily

Pollination by water is quite rare in flowering plants. It is limited to about 30 genera, mostly monocotyledons. Many aquatic plants do not use water for pollination at all.

(1) Zostera — Pollinated by water. It is a marine sea-grass. Its female flowers stay under water, and the long, ribbon-like pollen grains are carried through the water to the stigma.

(2) Water lily — Not pollinated by water. Its flowers come up above the water level. Insects or wind then pollinate it, as in most land plants.

(3) Hydrilla — Pollinated by water. It grows in fresh water, and NCERT lists it among the water pollinated plants.

(4) Vallisneria — Pollinated by water. The female flower reaches the water surface on a long stalk. The male flowers or pollen grains are released on the surface, and the water currents carry them to the female flowers.

NCERT Extract:
Pollination – “… Some examples of water pollinated plants are Vallisneria and Hydrilla which grow in fresh water and several marine sea-grasses such as Zostera. Not all aquatic plants use water for pollination. In a majority of aquatic plants such as water hyacinth and water lily, the flowers emerge above the level of water and are pollinated by insects or wind as in most of the land plants.”