Question

Assertion :Cultural eutrophication is nutrient enrichment of water bodies due to human activities like passage of sewage, industrial effluents, etc. Reason: The prime contaminants from sewage and industrial effluents are nitrates and phosphates, which act as plant nutrients and overstimulate the growth of algae.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Cultural or accelerated eutrophication is nutrient enrichment of water bodies due to human activities like passage of sewage, industrial effluents and runoff from fertilized fields rich in nitrates and phosphates. Nutrients present in sewage agriculture wastes and fertilizers cause dense growth of plants and algae. Soon algae increase in number and impart a characteristic coloration to water depending upon the pigments present in them. The excess growth of planktonic algae that causes coloration of water is called algal bloom.

So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.