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Created page with "==Key Stage 3== ===Meaning=== The gas exchange system in plants allows them to absorb and release both Oxygen and Carbon Dioxide. ===Abou..."
==Key Stage 3==
===Meaning===
The [[gas exchange system]] in [[plant]]s allows them to [[Asborb (biology)|absorb]] and release both [[Oxygen]] and [[Carbon Dioxide]].
===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]].
: 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]].
: 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]].
{| class="wikitable"
|-
|[[File:LeafCrossSectionDiagram.png|center|600px]]
|-
| 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.
|}
===Adaptations of Leaves===
: '''Leaves''' have a [[Waxy Cuticle|waxy cuticle]] to stop [[water]] escaping.
: '''Leaves''' contain [[Cell (Biology)|cells]] with many [[chloroplast]]s for [[photosynthesis]].
: '''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]].
{| class="wikitable"
|-
|[[File:Stomata.png|center|400px]]
|-
| style="height:20px; width:400px; text-align:center;" |The under side of a [[leaf]] showing [[Guard Cell|guard cells]] and [[Stoma|stomata]].
|}
===Meaning===
The [[gas exchange system]] in [[plant]]s allows them to [[Asborb (biology)|absorb]] and release both [[Oxygen]] and [[Carbon Dioxide]].
===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]].
: 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]].
: 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]].
{| class="wikitable"
|-
|[[File:LeafCrossSectionDiagram.png|center|600px]]
|-
| 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.
|}
===Adaptations of Leaves===
: '''Leaves''' have a [[Waxy Cuticle|waxy cuticle]] to stop [[water]] escaping.
: '''Leaves''' contain [[Cell (Biology)|cells]] with many [[chloroplast]]s for [[photosynthesis]].
: '''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]].
{| class="wikitable"
|-
|[[File:Stomata.png|center|400px]]
|-
| style="height:20px; width:400px; text-align:center;" |The under side of a [[leaf]] showing [[Guard Cell|guard cells]] and [[Stoma|stomata]].
|}