Lesson eLearning

Which component of domestic wastewater gives the green colour often seen in untreated sewage?

easy MCQ 1 mark Class 7 · Science · Wastewater Story
  1. a) Nitrogen
  2. b) Phosphorus
  3. c) Algae (microorganisms)
  4. d) Sulphur
Answer
c) Algae (microorganisms)

The correct answer is c) Algae (microorganisms) — Select option c, as it correctly identifies algae as the source.

Step-by-step solution

  1. Identify the source of green colour in untreated sewage.
  2. Recognise that green colour is caused by growth of algae or other microorganisms.
  3. Select option c, as it correctly identifies algae as the source.
Common mistake: Confusing nitrogen with the cause of green colour

Concept tested: Colour of wastewater

Published · How this solution was prepared and checked

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