Multiple choice

Sewage water can be purified for recycling with the action of�

  1. Aquatic plants

  2. Penicillin

  3. Micro-organisms

  4. Fishes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Microorganisms like bacteria break down organic matter in sewage through biological treatment processes. Sewage treatment plants use these microbes to purify water before it's recycled or discharged back into water bodies. This is a natural and effective way to treat wastewater.

Keep practicing — related questions