- 1(current)
Q. No.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: Â Water Pollution - Biological Oxygen Demand |
 92%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Subtopic: Â Water Pollution - Biological Oxygen Demand |
 83%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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: Â Gaseous Pollutants - Oxides of C & N |Â Air Pollution - Ozone |Â Water Pollution - Biological Oxygen Demand |
 71%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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: Â Water Pollution - Biological Oxygen Demand |
 71%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Phytoplanktons kill the fish because :
| 1. | Phytoplanktons decrease the BOD level that causes the death of fish. |
| 2. | Phytoplanktons increase the BOD level that causes the death of fish. |
| 3. | Phytoplanktons reduce the amount of dissolved CO2. |
| 4. | None of the above. |
Subtopic: Â Water Pollution - Biological Oxygen Demand |
 69%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
- 1(current)
Q. No.
© 2024 GoodEd Technologies Pvt. Ltd.