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===About Gas Exchange in Plants===
: Unlike [[animal]]s [[plant]]s do both [[respiration]] and [[photosynthesis]]. This means sometimes they take in more [[Oxygen]] and release more [[Carbon Dioxide]] and other times they take in more [[Carbon Dioxide]] and release more [[Oxygen]]. Overall a [[plant]] makes more [[Oxygen]] than [[Carbon Dioxide]].
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|[[File:Daytime.png|center|300px]]
|[[File:Nighttime.png|center|300px]]
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| style="height:20px; width:300px; text-align:center;" |During the day time the sunlight allows the plant to [[photosynthesis|photosynthesize]] so it takes in more [[Carbon Dioxide]] and releases more [[Oxygen]] than it needs for [[respiration]].
| style="height:20px; width:300px; text-align:center;" |During the night time where there is no light, [[photosynthesis]] cannot happen but the cells still need to [[respiration|respire]] so the plant takes in more [[Oxygen]] and releases more [[Carbon Dioxide]].
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===Gas Exchange in the Leaf===
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|[[File:LeafCrossSectionDiagram.png|center|600px]]
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| style="height:20px; width:600px; text-align:center;" |A [[diagram]] of the cross section of a [[leaf]] showing [[Palisade Cell]]s, [[Spongy Mesophyll Cell]]s and [[Guard Cell]]s.
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: '''Leaves''' have [[air]] gaps between the [[Spongy Mesophyll Cell|spongy mesophyll cells]] to allow [[Gas Exchange in Plants|gas exchange]].
: '''Leaves''' usually have more [[Guard Cell|guard cells]] and [[Stoma|stomata]] on the underside (lower epidermis) than the top side (upper epidermis). These close when the [[leaf]] gets [[dehydrate]]d, stopping [[Carbon Dioxide|carbon dioxide]] getting into the [[leaf]] which stops them using [[water]] for [[photosynthesis]].