Hydrilla is

Options

A. Phytoplankton
B. Floating hydrophyte
C. Submerged hydrophyte
D. Amphibian

Answer

C

Explanation

Types of Hydrophytes:
1) Free floating hydrophytes: They are not fixed in soil or mud. They freely float on the surface of water. E.g. :Pistia, Eichhornia, Wolffia, Azolla, Salvinia, Lemna.
a) Wolffia is rootless and free-floating aqutic plant.
2) Rooted floating hydrophytes: These are fixed in mud but leaves floats on water surface: E.g. Nelumbo, Nymphaea, Trapa.
a) Nelumbo and Nymphaea (water lily) have epistomatic leaves.
3) Rooted emergent hydrophytes or amphibious plants: Root fixed in soil but stem remain exposed to air.
a) Heterophylly is the common feature of attached emergent hydrophytes. E.g: Typha, Lymphophylla, Cyperus, Polygonum, Sagittaria.
4) Submerged floating hydrophyes: These plants are not rooted and remain under water completely. E.g: Ceratophyllium, Utricularia, etc.
5) Rooted submerged hydrophytes: They are fixed in mud and remian under water E.g.: Hydrilla, Vallisneria, Podostemon and Potamogeton.