Which of the following statements is correct?

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

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

Algal Bloom decreases fish mortality.

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

answer is C.

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Detailed Solution

Biomagnifi cation refers to an increase in the concentration of the toxicant at successive trophic levels. This occurs because the organisms at each trophic level accumulate and retain these substances which they
cannot metabolise or excrete, leading to higher concentrations in top predators.
(1) Algal blooms can increase fi sh mortality. The excessive growth of algae can deplete oxygen levels in the water, leading to hypoxic or anoxic conditions, which can be harmful or fatal to fish and other aquatic organisms.
(2) Eutrophication refers to the excessive enrichment of water bodies, such as lakes or rivers, with nutrients, primarily nitrogen and phosphorus.
(4) The presence of a large amount of nutrients, especially nitrogen and phosphorus, can actually promote
algal blooms rather than restrict them. These nutrients act as fertilisers for algae, stimulating their growth and
leading to excessive algal populations.

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