Multiple choice

Biological treatment of water pollution is done with the help of�

  1. Lichens

  2. Fungi

  3. Phytoplankton

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Biological treatment of water pollution uses microorganisms like phytoplankton to consume organic pollutants. Phytoplankton (C) are microscopic aquatic organisms that help purify water naturally. Lichens are typically air quality indicators. Fungi decompose matter but are more common in terrestrial environments. None of the above is incorrect since phytoplankton is valid.

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