how long can a plant live in a room full of carbon monoxide?

Answer 1

Carbon monoxide poisons animals because it binds to haemoglobin more tightly than oxygen does, and therefore it stops your blood from transporting oxygen around your body, and you die of oxygen stravation.

It has no effect on plants, unless there was absolutely *no* oxygen available (which could also be accomplished by filling the room with any other gas - like pure nitrogen).

Plants have a much slower metabolism than warm-blooded animals like humans, so even in a totally oxygen-free environment, they'd survive for quite a while. but they would die eventually.

Answer 2

Neither do I know of any harmful effect of CO on plants. Plants use CO2 as an ingredient for photosynthesis, but they also use oxygen for their own metabolic processes. So yes, a plant probably would not live indefinitely without oxygen or CO2. But keep looking. Some day a variation of photosynthesis may be found which utilizes CO. Or perhaps some plant can live in a symbiotic relationship with methanogenic bacteria, which use CO.