Objective Question & Answer

Statement 1 (Correct): The pond relies on a symbiotic relationship between algae and

bacteria.

Algae produce oxygen through photosynthesis, which is used by bacteria to break down

organic matter, while bacteria release carbon dioxide utilized by algae.

Statement 2 (Incorrect): The detention (retention) period for waste stabilization or oxidation ponds is typically much longer, generally ranging from 10 to 30 days (or 2 to 4 weeks), rather than 2 to 3 days.

Statement 3 (Correct): Dissolved oxygen in the pond is supplied by algae via photosynthesis.

Statement 4 (Incorrect): Waste stabilization ponds are predominantly facultative (containing both aerobic and anaerobic zones) or feature facultative/anaerobic bacteria, rather than strictly aerobic bacteria throughout.