Gas Exchange in Plants SBI 3U. Plants need Oxygen too. Plants obtain the gases they need through...
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Transcript of Gas Exchange in Plants SBI 3U. Plants need Oxygen too. Plants obtain the gases they need through...
Gas Exchange in Plants
SBI 3U
Plants need Oxygen too.
• Plants obtain the gases they need through their leaves.
• They require oxygen for respiration and carbon dioxide for photosynthesis.
http://www.chemsoc.org/networks/LearnNet/cfb/images/12A.jpg
The gases diffuse into the intercellular spaces of the leaf through pores, which are normally on the underside of the leaf – stomata. From these spaces they will diffuse into the cells that require them.
The Epidermis of a leaf.
http://virtual.yosemite.cc.ca.us/randerson/Lynn's%20Bioslides/27.jpg
Stomatal opening and closing depends on changes in the turgor of the guard cells. When water flows into the guard cells by osmosis, their turgor increases and they expand. If the guard cells loose water the opposite happens and the pore closes.
http://biology.unlv.edu/Schulte/Anatomy/Leaves/PopulusStomata.jpg
http://www.plantsci.cam.ac.uk/Webb/images/stomata.jpg
http://bio1151.nicerweb.com/Locked/media/ch36/36_15GuardCellFunction.jpg
http://www.progressivegardens.com/knowledge_tree/stomata.jpg
Lenticels – pores in the bark of stems
http://sciencecity.oupchina.com.hk/biology/student/glossary/img/lenticels.jpg
http://www.treedictionary.com/DICT2003/IMAGES/LENTICELS%20BIRCH.jpg
http://www.digitalfrog.com/resources/archives/leaf.jpg
http://www.biotopics.co.uk/plants/leafst.html
http://home.comcast.net/~john.kimball1/BiologyPages/S/stoma.gif
http://www.northern.edu/ramsayj/etechWeb/images/leaves/leaf%20example1%20copy.JPG
Transport in plants
SBI 3U
http://www.bbc.co.uk/schools/gcsebitesize/img/bixylemphloem.gif