how co2 moves out from leaves during night when stomata are close
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ci2is removed out when stomata are close by osmosis
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O2 and CO2 are gases and can diffuse through the epidermis as such following concentration gradients. Gas "barriers", as the one in the bundle sheath cells of C4 plants are needed to increase the diffusion resistance to a given gas. In cells, CO2 can be "stored" in organic acids or other forms, and O2 will likely leave the tissue following concentrations gradients (not keeping O2 around is beneficial to prevent high rates of photorespiration).
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