In $Eichhornia$ (water hyacinth) and $Nymphaea$ (water lily),pollination occurs by:

Statement-$I$ :- Animals are attracted to flowers by colour or/and fragrance.
Statement-$II$ :- To sustain animal visits,the flowers have to provide rewards to the animals.

Cross-pollination in crop plants is known as:

In which of the following plants are the pollen grains long and ribbon-like?

It grows in a watery environment,but pollination occurs through insects or air.

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