The primary agent that helps in the decomposition of biodegradable matter in domestic sewage is .
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A.
phosphate
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B.
nitrate
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C.
bacterium
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D.
chloride
Correct Answer:
C. bacterium
Explanation:
Bacteria are the fundamental agents responsible for breaking down biodegradable organic matter in domestic sewage. This biological decomposition occurs through the metabolic activities of various microorganisms, primarily aerobic and anaerobic bacteria, which consume complex organic compounds like proteins, carbohydrates, and fats as food. During this process, these microorganisms transform unstable organic waste into simpler, more stable substances such as carbon dioxide, water, nitrates, and sulfates, effectively reducing the sewage's biochemical oxygen demand and helping to purify the water before it is released back into the environment. Chlorine is typically used for disinfection rather than decomposition, while nitrates and phosphates are often byproducts or components of sewage rather than the primary agents of breakdown.
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