A) Beggiata
B) Chlorella
C) Spirogyra
D) Eichhornia
Correct Answer: D
Solution :
Eichhomia and certain phytoplankton have capacity of purification of water. Cells of these plants uptake and accumulate heavy metals and other toxicants of polluted water. Organic pollutants of water like petroleum can be degraded with the help of bacteria Pseudomonas. Beggiatoa is a sulphur bacteria which oxidises hydrogen sulphide to sulphur. Chlorella and Spirogyra are green algae, which does not helps in purification of water.
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