A) Azolla
B) Typha
C) Salix
D) Vallisneria
Correct Answer: D
Solution :
Hydrosere originating in a pond starts with colonization of some phytoplanktons which forms the pioneer plant community. The stages are Ist-Bacteria, Blue-green algae. Algae II-Hydrilla Potamogeton, Vallisneria IIIrd-Nelumbo, Nymphaea, Trapa, Azolla, Wolffia IVth-Typha, Sagitaria V-Juncus, Cyperus Vl-Salix, Populus, Almus
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