Which one of the following statements is not correct?

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The amount of some toxic substances of industrial waste water increases in the organisms at successive trophic levels.

The micro-organisms involved in biodegradation of organic matter in a sewage polluted water body consume a lot of oxygen causing the death of aquatic organisms.

Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries.

Water hyacinth grows abundantly in eutrophic water bodies and leads to an imbalance in the ecosystem dynamics of the water body.

answer is C.

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Detailed Solution

Algal blooms are typically considered detrimental to water quality and ecosystem health.
Algal blooms are caused by excessive organic matter from sewage pollution or nutrient runoff. They can deplete oxygen levels, produce toxins and block sunlight penetration, negatively impacting the ecosystem.
(1) As we move up the trophic levels in a food chain, the concentration of some toxic substances tends to increase due to biomagnification.
(2) When sewage pollution introduces excessive organic matter into a water body, microorganisms involved in the biodegradation process consume a significant amount of oxygen through aerobic respiration. This can lead to a depletion of oxygen levels in the water, causing hypoxia or anoxia, which can harm or even result in the death of aquatic organisms.
(4) Water hyacinth is an invasive plant species that can grow rapidly in eutrophic water bodies, where there
is an excessive accumulation of nutrients like nitrogen and phosphorus. Its excessive growth can lead to an
imbalance in the ecosystem dynamics, including reduced oxygen levels, decreased biodiversity and hindrance
to other aquatic life forms.

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