Water Pollution - Biological Oxygen Demand NCERT Exercise Based MCQs Environmental Chemistry (OLD NCERT) Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

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: Water Pollution - Biological Oxygen Demand |

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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: Water Pollution - Biological Oxygen Demand |

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