Explain the three process of pollination in Vallisneria. How is it different in water - lily, which is also an aquatic plant?
In Vallisneria pollination takes place through water, the female flower reach the surface of water by long stalks, male flowers / pollen grains released onto the surface of water carried passively by water current reducing the female flowers / stigma.
In water lily pollination takes place through wind or insects, female flower emerges above the surface of water and gets pollinated.