Assertion (A): Bacterial examination of water is done as it indicates the degree of pollution. And Water polluted by sewage contains only one species of disease-producing pathogenic bacteria.
Reason (R): Standard Plate Count Test, Most Probable Number, Membrane Filter Technique are the tests carried out to estimate the bacterial quality of water.
1
Both A and R are true and R is the correct explanation of A.
2
Both A and R are true and R is NOT the correct explanation of A.
3
A is true but R is false.
4
A is false but R is true.