Biochemical Oxygen Demand (BOD) is-

1. Amount of oxygen required by bacteria to decompose organic matter in a certain volume of a sample of water.
2. Amount of CO2 required by bacteria to decompose organic matter in a certain volume of a sample of water.
3. Amount of O3 required by bacteria to decompose organic matter in a certain volume of a sample of water.
4.  None of the above

Subtopic:  Water Pollution - Biological Oxygen Demand |
 92%
From NCERT
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Incorrect statement among the following is: 

1. Oxides of sulphur, nitrogen, and carbon are the most widespread air pollutant.

2. pH of drinking water should be between 6.5 and 8.5.

3. Concentration of dissolved oxygen below 6 ppm is good for the growth of fish.

4. Clean water would have a BOD value of less than 5 ppm.

Subtopic:  Gaseous Pollutants - Oxides of C & N | Air Pollution - Ozone | Water Pollution - Biological Oxygen Demand |
 71%
From NCERT
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Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be : 

1. Highly polluted.

2. Poor in dissolved oxygen.

3. Rich in dissolved oxygen.

4. Not suitable for aquatic life.

Subtopic:  Water Pollution - Biological Oxygen Demand |
 71%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh