Question : Which of the following weeds has been found useful to check water pollution caused by industrial affluents?
Option 1: Parthenium
Option 2: Elephant grass
Option 3: Water hyacinth
Option 4: Both (1) and (2) above
Correct Answer: Water hyacinth
Solution : The correct option is - Water hyacinth.
Water hyacinth is a perennial free-floating aquatic plant that scavenges organic and inorganic water contaminants and grows rapidly. The plant can clean up to 40% of contaminated water. Waste water from dairy facilities, tanneries, sugar mills, pulp and paper manufacturers, distilleries, palm oil mills, etc. is treated using water hyacinth.
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