Assertion: Water pollutants are measured by BOD.
Reason: If BOD is more, the water is polluted.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Explanation:
Water pollutants are commonly measured by their main common denominator, called BOD (Biochemical Oxygen Demand), i.e., the amount of free oxygen absorbed by extraneous substances from water. If water is polluted, it will consume more oxygen, thereby enhancing the BOD of water.
Water pollution is more in the modern days due to so many industries are mixied their wastage in the river water. Lots of rivers in the cities are polluted due to modern industires. Millions of living things are affected due to water pollution. I hope government will take right action to reduce the water pollution.