Q173 / 180 · NEET 2015 (Phase 1) · Zoology

The high value of BOD (Biochemical Oxygen Demand) indicates that:

  • A
    Water is pure
  • Correct answer
    B
    Water is highly polluted
  • C
    Water is less polluted
  • D
    Consumption of inorganic matter in the water is higher by the microbes

Solution

Biochemical Oxygen Demand (BOD) is the amount of oxygen that would be consumed if all the organic matter in one litre of water were oxidized by bacteria. The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water. The greater the BOD of waste water, more is its polluting potential.

Hence, the correct answer is option: 'B'.

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