Which of the following statements is correct?

1. Algal Bloom decreases fish mortality

2. Eutrophication refers to increase in domestic sewage and waste water in lakes.

3. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.

4. Presence of large amount of nutrients in water restricts 'Algal Bloom'

Doubtly Asked 30 Oct 2026 NEET UG 2023 neet Save WhatsApp Report

1 answer

Best answer

Answer: 3. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.

Key idea: Look at each statement.

Algal bloom increases fish mortality (it uses up oxygen), so option 1 is wrong.
Eutrophication is nutrient enrichment of a lake, not just an increase in sewage, so option 2 is wrong.
Biomagnification is the increase in toxicant concentration at successive trophic levels, which is correct.
Large amounts of nutrients cause algal bloom, not restrict it, so option 4 is wrong.

Option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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