Which one of the following statements is NOT correct?
- A
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
- B
Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries
- C
Water hyacinth grows abundantly in eutrophic water bodies and leads to an imbalance in the ecosystem dynamics of the water body
- D
The amount of some toxic substances of industrial waste water increases in the organisms at successive trophic levels
Algal blooms worsen water quality: they discolour the water, deplete dissolved oxygen when the bloom decays, can release toxins, and cause large fish kills. So statement (2) is incorrect. The other three statements correctly describe biodegradation-induced hypoxia, water-hyacinth invasion, and biomagnification.
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