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NEET 2009
Exam
NEET
Year
2009
Subject
Botany
Chapter
Ecosystem

NEET 2009 · Botany · Ecosystem

The correct sequence of plants in a hydrosere is

The correct sequence of plants in a hydrosere is

Options

  1. AOak →\rightarrow Lantana →\rightarrow Scirpus →\rightarrow Pistia →\rightarrow Hydrilla →\rightarrow Volvox
  2. BVolvax →\rightarrow Hydrilla →\rightarrow Pistia →\rightarrow Scirpus →\rightarrow Lantana →\rightarrow Oak
  3. CPistia →\rightarrow Volvox →\rightarrow Scirpus →\rightarrow Hydrilla →\rightarrow Oak →\rightarrow Lantana
  4. DOak →\rightarrow Lantana →\rightarrow Volvox →\rightarrow Hydrilla →\rightarrow Pistia →\rightarrow Scirpus

Correct answer

B. Volvax →\rightarrow Hydrilla →\rightarrow Pistia →\rightarrow Scirpus →\rightarrow Lantana →\rightarrow Oak

Step-by-step solution

The various stages in a hydrosere are well studied in ponds, pools or lakes. 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 rain forests, mixed forests of Almus, Acer, Quercus (oak), tropical deciduous forests.
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