Question

Evidence of eutrophication of water indicates

• A. Reduced oxygen demand
• B. Rapid decomposition of organic matter
• C. Algal bloom
• D. Red tide

Answer 1

The correct option is C Algal bloom

The streams draining the fertilisers into the lake introduce nutrients such as nitrogen and phosphorus, which encourage the growth of algae. As the lake's fertility increases, algal bloom occurs which is known as eutrophication. Algal bloom causes the deterioration of water quality and death of aquatic plants and animals like fishes.

Thus, the correct answer is option C.