The insect $Blastophaga$ $grossorum$ is associated with the pollination of

In water hyacinth and water lily,pollination takes place by

Identify the set of correct statements:
$A$. The flowers of Vallisneria are colourful and produce nectar.
$B$. The flowers of water lily are not pollinated by water.
$C$. In most of water-pollinated species,the pollen grains are protected from wetting.
$D$. Pollen grains of some hydrophytes are long and ribbon like.
$E$. In some hydrophytes,the pollen grains are carried passively inside water.
Choose the correct answer from the options given below.

In which aquatic plant does pollination occur through biotic agents?

The mature stigma is either rough or sticky in

Which type of pollination is more common amongst abiotic pollinations?