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===Meaning===
[[File:LeafCrossSection.png|right|300px|thumb|The '''two guard cells''' can be seen at the [[leaf]].]]
A '''guard cell''' is a [[Specialised Cell|specialised cell]] in a [[plant]] [[leaf]] which contains can change shape to allow or stop gases [[gas]]es from getting into the [[leaf]].
===Adaptations of the Guard Cell===
| style="height:20px; width:250px; text-align:center;" |[[Flaccid]] '''guard cells''' are [[dehydrated]] and the [[stoma]] is blocked stopping air form getting in or out of the [[leaf]].
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==Key Stage 4==
===Meaning===
A '''guard cell''' is a [[Specialised Cell|specialised cell]] in a [[plant]] [[leaf]] which can change shape to open or close a hold in the [[leaf]] called a [[stoma]] allowing or preventing [[gas]] exchange.
===About Guard Cells===
: '''Guard Cells''' are essential to control the rate of [[photosynthesis]] and [[transpiratation]].
: When '''guard cells''' become '''flaccid''', due to [[dehydration]], the [[stomata]] close and [[Water Vapour|water vapour]] can no longer escape the [[leaf]]. This stops [[transpiration]], preventing further [[water]] loss. The closed [[stomata]] also prevent [[Carbon Dioxide]] from entering the [[leaf]], stopping [[photosynthesis]] and conserving [[water]] (which is needed for [[photosynthesis]].