Ecosystem Question 57
57. The correct sequence of plants in a hydrosere is:
[2009]
(a) Volvox $\to$ Hydrilla $\to$ Pistia $\to$ Scirpus Lantana $\to$ Oak
(b) Pistia $\to$ Volvox $\to$ Scirpus $\to$ Hydrilla $\to$ Oak $\to$ Lantana
(c) Oak $\to$ Lantana $\to$ Volvox $\to$ Hydrilla $\to$ Pistia $\to$ Scirpus
(d) Oak $\to$ Lantana $\to$ Scirpus $\to$ Pistia $\to$ Hydrilla $\to$ Volvox
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Answer : a
Hints & Solutions
(a) The correct sequence of plants in a hydrosere is Volvox, Hydrilla, Pistia, Scirpus, Lanatana and Oak. A hydrosere is a plant succession which occurs in a fresh water lake. In time, an area of open fresh water such as a lake will naturally dry out, ultimately becoming woodland. During this change, a range of different landtypes such as swamp and marsh will succeed each other. The succession from open water to climax woodland is likely to take at least two hundred years.
