List the different types of hydrophytes with Examples.

Explanation

Hydrophytes are classified according to their relation to water and air. They are sub-divided into following categories :
(i) Free floating hydrophytes
(ii) Rooted-floating hydrophytes
(iii) Submerged floating hydrophytes
(iv) Rooted-submerged hydrophytes
(v) Amphibious hydrophytes.
(i) Free floating hydrophytes : These plants float freely on the surface of water. They remain in contact with water and air, but not with soil.
Examples :
Eichhornia, Pistia and Wolffia
(ii) Rooted floating hydrophytes : The roots are fixed in mud, but their leaves and flowers are floating on the surface of water. Plants are in contact with soil, water and air. Examples : Nelumbo, Nymphaea,
(iii) Submerged floating hydrophytes : Plants are completely submerged in water and not in contact with soil and air.
Examples :
Ceratophyllum and Utricularia.
(iv) Rooted-submerged hydrophytes : Plants are completely submerged in water and rooted in soil and not in contact with air.
Examples :
Hydrilla, Vallisneria and Isoetes.
(v) Amphibious hydrophytes (Rooted emergent hydrophytes) : Plants are adapted to both aquatic and terrestrial modes of life. Grow in shallow water.
Examples : Ranunculus, Typha