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Creative, plants both transpire and respire. transpiration is the evaporation of water from the stomata on the surface of leaves. respiration is limited to cellular respiration as there is no physical gas transport system. respiration is (in super simplified terms) the conversion of oxygen and food into energy. both o2 in and co2 out during the night (when cellular respiration dominates) and co2 in and o2 out (during daylight hours with photosynthesis) occur mainly through straight diffusion via the same stomata that allow/cause the plant to lose water. i think they can do it their roots as well. Matthew