The correct sequence of plants in a hydrosere is

Options

A. Oak – Lantana – Scirpus – Pistia – Hydrilla – Volvox
B. Volvox – Hydrilla – Pistia – Scirpus – Lantana – Oak
C. Pistia – Volvox – Scirpus – Hydrilla – Oak – Lantana
D. Oak – Lantana – Volvox – Hydrilla – Pistia – Scirpus

Answer

B

Explanation

The various stages in hydrosere are:
* Phytoplankton stage - some blue-green algae, green algae (Volvox), diatoms and bacteria etc.
* Rooted submerged stage - Hydrilla, Vallisneria.
* Floating stage - Nelumbo, Nymphaea etc. some freefloating species are Pistia, Azolla, and Lemna etc.
* Reed swamp stage - species of Cyperaceae and Gramineae.
* Forest stage - Tropical rain forest, mixed forest of Almus, Acer, Quercus (oak), tropical deciduous forest.