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Answer: 1. Micro organisms present in the soil

Key idea: CO is removed from air mainly by soil micro-organisms.

Certain soil bacteria and fungi oxidise CO to \(\mathrm{CO_2}\) and use it as a source of energy, so soil acts as the natural sink of CO. Oceans and plants are sinks for \(\mathrm{CO_2}\), not CO. Haemoglobin binds CO strongly (forming carboxyhaemoglobin), but that is a poisoning effect in the body and not an environmental sink.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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