Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm):
Question:

Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm):

1.  for sustaining life in a water body.

2. by bacteria to break-down organic waste in a certain volume of a water sample.

3. for the photochemical breakdown of waste present in 1 $\mathrm{m}^{3}$ volume of a water body.

4. by anaerobic bacteria to breakdown inorganic waste present in a water body.

Correct Option: , 2

Solution:

Biochemical oxygen demand is the amount of oxygen required by bacteria to break down the organic matter present in a given volume of a sample of water.

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