Biochemical oxygen demand (BOD) in a river water
(a) has no relationship with concentration of
oxygen in the water
(b) gives a measure of Salmonella in the water
(c) increases when sewage gets mixed with river
water
(d) remains unchanged when algal bloom occurs.
(a) has no relationship with concentration of
oxygen in the water
(b) gives a measure of Salmonella in the water
(c) increases when sewage gets mixed with river
water
(d) remains unchanged when algal bloom occurs.