Question

Assertion :Algal blooms occur in nutrient poor water. Reason: Algal blooms make water unfit for human consumption but cause enormous growth of fish.

• 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 D Both Assertion and Reason are incorrect

Algal bloom is the rapid growth of algae in water due to which coloured scums are formed on the surface. It is formed due to eutrophication. Eutrophication is the phenomenon of nutrient enrichment of nitrogen and phosphorus in a water body that supports a dense growth of plants and animal life. Due to nutrient enrichment, excess growth of algae occurs which is called algal bloom. Hence, assertion is incorrect.

When these algae die, their organic matter gets decomposed and this results in the depletion of oxygen leading to death of aquatic animals. Hence, reason is also incorrect.

So, the correct answer is 'Both Assertion and Reason are incorrect'.