Engineering Board Exam Reviewer · Environmental Engineering · medium

Oxidation ponds (stabilization ponds) rely on a symbiotic relationship between:

1. Fish and plants
2. Fungi and viruses
3. Algae and bacteria
4. Protozoa and insects

Answer

C. Algae and bacteria

Solution

Algae produce oxygen used by bacteria; bacteria release CO2 and nutrients used by algae.

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