Which of the following statements is correct?
- A
Eutrophication refers to increase in domestic sewage and waste water in lakes.
- B
Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.
- C
Presence of large amount of nutrients in water restricts 'Algal Bloom'
- D
Algal Bloom decreases fish mortality
Biomagnification is the progressive build-up of a non-degradable toxicant at higher trophic levels because each predator concentrates the contaminant from many prey items — option (2) is correct. Eutrophication refers to natural nutrient enrichment and ageing of a lake, not just sewage input. Excess nutrients promote (not restrict) algal blooms, and blooms increase fish mortality through oxygen depletion.
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