Multiple choice

Water pollution is caused by�

  1. Decay of bodies of aquatic organisms

  2. Rain

  3. Growth of phytoplankton

  4. Industrial effluents
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Industrial effluents contain toxic chemicals and heavy metals that contaminate water bodies. These wastes from factories and manufacturing processes are a major source of water pollution worldwide. The other options are natural processes or part of aquatic ecosystems.

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