19,879
edits
Changes
no edit summary
==Key Stage 3==
===Meaning===
[[File:LeafCrossSection.png|right|300px|thumb|The '''two guard cells''' can be seen at the top of this [[leaf]].]]
A '''guard cell''' is a [[Specialised Cell|specialised cell]] in a [[plant]] [[leaf]] which can change shape to allow or stop [[gas]]es from getting into the [[leaf]].
==Key Stage 4==
[[File:Stomata.png|right|300px|thumb|Several pairs of '''guard cells''' can be seen on this [[magnified]] [[image]] of a [[leaf]].]]
===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.