Given below are two statements:
Statement I: The value of the parameter " Biochemical Oxygen Demand (BOD)' is important for survival of aquatic life.
Statement II : The optimum value of BOD is 6.5 ppm .
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement I: The value of the parameter " Biochemical Oxygen Demand (BOD)' is important for survival of aquatic life.
Statement II : The optimum value of BOD is 6.5 ppm .
In the light of the above statements, choose the most appropriate answer from the options given below:
- (A)Both statement I and Statement II are false
- (B)Statement I is false but Statement II is true
- (C)Statement I is true but Statement II is false✓ Correct
- (D)Both Statement I and Statement II are true
Answer: (C)
Solution
Biochemical oxygen demand is the amount of dissolved oxygen that micro-organisms consume while breaking down the organic matter in a water sample, so it measures how much oxygen is left for fish and other aquatic organisms, and a high value starves them; Statement I is true. Clean water has a BOD below ppm while heavily polluted water reaches ppm or more, so ppm is not an optimum value of BOD; Statement II is false. Statement I is true but Statement II is false.
JEE Main · 2021 · 24 Feb 2021 · Shift 2 · Single correct option