- 1(current)
Q. No.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%
Level 2: 60%+
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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 |
 91%
Level 1: 80%+
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Q. No.
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