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The correct sequence of plants in a hydrosere is
Oak $\rightarrow$ Lantana $\rightarrow$ Scirpus $\rightarrow$ Pistia $\rightarrow$ Hydrilla $\rightarrow$ Volvox
Volvox $\rightarrow$ Hydrilla $\rightarrow$ Pistia $\rightarrow$ Scirpus $\rightarrow$ Lantana $\rightarrow$ Oak
Pistia $\rightarrow$ Volvo $x \rightarrow$ Scirpus $\rightarrow$ Hydrill $\rightarrow$ Oak $\rightarrow$ Lantana
Oak $\rightarrow$ Lantana $\rightarrow$ Volvox $\rightarrow$ Hydrilla $\rightarrow$ Pistia $\rightarrow$ Scirpus
Solution
The various stages in a hydrosere are well studied in ponds, pools or lakes. The various stages of hydrosere are : $(i)$ Phytoplankton stage, $e.g.$, Some blue-green algae, green algae (Volvox), diatoms and bacteria, etc. $(ii)$Rooted submerged stage, $e.g.$, Hydrilla, Vallisneria, etc. $(iii)$ Floating stage, $e.g.$, Nelumbo, Nymphaea, etc. Some free floating species are Pistia, Azolla, Lemna, etc. $(iv)$ Reed-swampstage, $e.g.$, Species of Scirpus, Typha, etc. $(v)$ Sedge-meadow stage, $e.g.$, Species of Cyperaeae and Gramineae. $(vi)$ Woodland stage, $e.g.$, Lantana, Salix, Populus, etc. $(vii)$ Forest stage, $e.g.$, Tropical rain forests, mixed forests of Almus, Acer; Quercus (oak), tropical deciduous forests.
