A) Oak\[\to \]Lantana\[\to \]Scirpus\[\to \]Pistia\[\to \] Volvox
B) Volvox \[\to \]Hydrilla \[\to \] Pistia \[\to \] Scirpus \[\to \]Lantana \[\to \]Oak
C) Pistia\[\to \] Volvox \[\to \] Scirpus\[\to \] Hydrilla\[\to \]Oak \[\to \]Lantana
D) Oak \[\to \] Lantana \[\to \] Volvox\[\to \] Hydnlla \[\to \]Pistia \[\to \]Scirpus
Correct Answer: B
Solution :
Hydrosere is a plant succession which starts in water. A wetland which is a transitional area between open freshwater and drylands. The various stages of hydrosere are : (i) Phytoplankton stage, eg, some blue-green algae, green algae (.Volvox), diatoms and bacteria, etc. (ii) Rooted submerged stage, eg, Hydrilla, Vallisneria. etc. (iii) Floating stage, eg, Nelumbo, Nymphaea, etc. Some free floating species are Pistia, Azolla, Lemna. etc. (iv) Red-swamp stage, eg, species of Scirpus, Typha, etc. (v) Sedge-meadow stage, eg, species of Cyperaceae and Gramineae. (vi) Woodland stage, eg, Lantana, Salix, Populus, etc. (vii) Forest stage, eg, tropical rainforests, mixed forests of Almus, Acer, Quercus (oak), tropical deciduous forests.
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