Plants are removed from patient's room at night because

They release more

C O_{2}

at night

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They produce

C O_{2}

all the time but release

O_{2}

also in the day time

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They consume

O_{2}

at night

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They do not photosynthesise at night, therefore fail to liberate

O_{2}

in the room and hence their presence will
increase

C O_{2}

concentration.

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Solution

The correct option is D They do not photosynthesise at night, therefore fail to liberate $O_{2}$ in the room and hence their presence will
increase $C O_{2}$ concentration.
Plants undergo phytosynthesis during day not in the nights. So they release $C O_{2}$ in nights.

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