Question

Water pollution causes ________.

• A. Increased photosynthesis
• B. Increased deoxygenation and turbidity
• C. Decreased turbidity
• D. Increased oxygenation

Answer 1

The correct option is B Increased deoxygenation and turbidity

• Water pollution occurs due to the release of inorganic and organic toxins released into the water body by the discharge of untreated sewage, industrial waste and surface run-off.
• These pollutants allow the excessive growth of the algae called the algal bloom and also trigger the massive decomposition activity by the decomposing bacteria.
• These result in a significant reduction in the amount of the dissolved oxygen in the water causing an increase in the biological oxygen demand or deoxygenation.
• The presence of the suspended particles and heavy metal waste decrease the visibility in the water and causing an increase in turbidity.

Hence, the correct answer is option B.