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→Rate of Photosynthesis
| style="height:20px; width:200px; text-align:center;" |[[Carbon Dioxide]] - [[Photosynthesis]] needs [[Carbon Dioxide]]. The more [[Carbon Dioxide]], the quicker [[photosynthesis]]. Beyond a certain [[concentration]] of [[Carbon Dioxide]] the rate of [[photosynthesis]] will stop increasing as it also limited by [[water]] and [[light]] [[intensity]].
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: The rate of [[photosynthesis]] can be controlled by the [[Guard Cell|guard cells]] opening and closing the [[stomata]].
: When the [[leaf]] becomes [[dehydrated]] the [[Guard Cell|guard cells]] become [[flaccid]] causing the [[stomata]] to close. This prevents [[Carbon Dioxide]] from entering the [[leaf]]. This reduces the rate of [[photosynthesis]] so less [[water]] is used.
: When the [[leave]] has enough [[water]] the [[Guard Cell|guard cells]] become [[turgid]] causing the [[stomata]] to open. This allows [[Carbon Dioxide]] into [[leaf]]. This increases the rate of [[photosynthesis]] so more [[water]] is used.