Q119: What is the intermediate zone composed of in aerobic-anaerobic ponds? - Water and Soil Pollution & Remediation - Environmental Science- ICAR JRF/SRF 2024 | Agrigyan
Upper Aerobic Zone: Abundant sunlight and oxygen produced by photosynthetic algae supporting aerobic heterotrophic bacteria.
Intermediate Facultative Zone: Inhabited by facultative bacteria that metabolize soluble organics oxidatively when dissolved oxygen is present or anaerobically via fermentation when oxygen is depleted.
Bottom Anaerobic Zone: Devoid of oxygen, where anaerobic methanogens digest settled organic sludge.
Correct option: (3) Facultative bacteria
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