Question

Sewage from the nearby town was dumped into the sea. Which among the given conditions

would happen in the above ecosystem after mixing of sewage into the water?

i) Biochemical oxygen demand (BOD) of receiving water body increases.

ii) Dissolved oxygen of receiving water body increases.

iii) It will cause mortality among fish and other aquatic creatures

iv) It will lead to nutrient enrichment of receiving waterbody.

a) i, iii, iv

b) i .ii ,iv

c) ii, iii

d) iii, i​

Answer 1

Answer:

the answer will be d) 3,1

Answer 2

Answer:

option a) i) Biochemical oxygen demand (BOD) of receiving water body increases.

iii) It will cause mortality among fish and other aquatic creatures

iv) It will lead to nutrient enrichment of receiving waterbody.