A) sulphates and phosphates
B) nitrates and sulphates
C) nitrates and phosphates
D) nitrates and carbonates
Correct Answer: C
Solution :
Lakes in many parts of the world have been severely entrophied by sewage, agricultural and industrial wastes. The prime contaminants are nitrates and phosphates which act as plants nutrient. They over stimulate the growth of algae and utilising the dissolved oxygen vital for aquatic life,
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