Quote:
Originally Posted by Gill Catton  plants produce carbon dioxide in the absence of light- but not because they are composed mostly of carbon but because of the gaseous exchange caused by photosynthesis?
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Plants are always respiring/breathing like us and producing CO2. Its just when theres light they produce O2 (oxygen) as a by product of photosynthesis (which uses up CO2), and use up more CO2 than they produce.