Question

Which one of the following statements is NOT correct?

Options

• 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.

• 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.

Answer 1

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

Explanation:

Excess organic matter triggers algal blooms, which significantly damage water quality rather than helping it. As these massive amounts of organic material decompose, they strip the water of oxygen, creating a toxic environment that kills fish and makes the water unsafe for human use. Consequently, these blooms are detrimental to both the local ecosystem and the fishing industry.