Question:
Biochemical Oxygen Demand, (BOD) is a measure of organic material present
in water. BOD value less than 5 ppm indicates a water sample to be __________.
(i) rich in dissolved oxygen.
(ii) poor in dissolved oxygen.
(iii) highly polluted.
(iv) not suitable for aquatic life.
Solution:
Option (i) rich in dissolved oxygen is the answer.