Question

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.

• 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
• D. Both Statement I and Statement II both are true

Answer 1

The correct option is C Statement I is true but Statement II is false

Ans: (c)

For survival of aquatic life the most important parameter is the concentration of dissolved oxygen. More is the value of biochemical oxygen demand, less will be the concentration of dissolved oxygen in water. If the concentration of dissolved oxygen in water is below 6 ppm, the growth of fish gets inhibited. Thus, BOD value is important for survival of aquatic life. Clean water would have BOD value of less than 5 ppm.