The correct sequence of plants in a hydrosere is

Options

A. Oak `to` Lantan ` to` Scirpus `to` Pistia ` to ` Hydrilla `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` Hydrilla `to` Pistia `to` Scirpus

Answer

B

Explanation

(b) 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) Red-swamp stage , e.g. species of Scirpus , Typha , etc.
(v) Sedge- meadow stage , e.g. species of Cyperaceae and Gramineaa .
(vi) Woodland stage , e.g. Lantana , Salix, Populus , etc.
(vii) Forest stage, e.g. Trophical rain forests , mixed forests of Almus , Acer , Quercus (oak), trophical deciduous forests.