state gov APPSC (ఆంధ్రప్రదేశ్) Group 2 (Pre + Mains) Mock Test 2023 Biology Ecology and Environment Ecosystem
Consider the following statements :
A. BOD is oxygen consumed by micro-organisms and is an index of water pollution.
B. Drinking water should have BOD level of 1 to 2 ppm.
Which of the above statements is/are correct?
1
B only
2
Neither A nor B
3
A only
4
Both A and B