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NEET 2010
Exam
NEET
Year
2010
Subject
Zoology
Chapter
Microbes in Human Welfare

NEET 2010 · Zoology · Microbes in Human Welfare

When domestic sewage mixes with river water

When domestic sewage mixes with river water

Options

  1. Asmall animals like rats will die after drinking river water
  2. Bthe increased microbial activity releases micronutrients such as iron
  3. Cthe increased microbial activity uses up dissolved oxygen
  4. Dthe river water is still suitable for drinking as impurities are only about 0.1%0.1 \%

Correct answer

C. the increased microbial activity uses up dissolved oxygen

Step-by-step solution

Domestic sewage consists a lot of degradable organic matter. When this sewage is released into river water, it will result in an increase of Biochemical Oxygen Demand (BOD) and decrease in the amount of dissolved oxygen due to decomposing activity of microbes.
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