In nature,flowers and their pollinator species are tightly linked with one another. This example involves . . . . . . .

Pollination which occurs in closed flowers is known as

Wind-pollinated flowers are .......

The stigma of an insect-pollinated flower is usually:

Statement-$I$: Pollination by water is quite rare in flowering plants and is limited to about $30$ genera.
Statement-$II$: Hydrophytes pollen grains are protected from wetting by a mucilaginous covering.

Select the correct option for pollination in $Zostera$.