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HISTORY OF PHOTOSYNTHESISBy: Alaleh, Atiqa, Anna LisaTime line

J.B. Van Helmont:A Dutch physician, chemist, and alchemist

Discovered that water plays an important role in the growth of plants.

Prior KnowledgeJ.B. Van Helmont Results of J.B. Van Helmont experimentMass of plantMass of SoilSize of treeAfter 5 yearsMass of plantMass of SoilSize of tree2.3 Kg90.7Kgsmall76.7 Kg90.1KgBig

Stephen Hales: the English physiologist, chemist, and inventorDiscovered that plants absorb airStephen Hales experiment Joseph Priestley: The English chemistDiscovered that plants gave out oxygen

Joseph Priestley's 1st experimentResults for Joseph Priestley's 1st experimentCandle before plant is addedCandle after plant is addedDied outKept burning

Joseph Priestleys 2nd experiment

Results for Joseph Priestley's 2nd experimentMouse before mint plant was addedMouse after mint plant was addedDiedStayed alive

References:The Discovery of Photosynthesis." The Orchid Grower: A Juvenile Science Adventure Novel. N.p., n.d. Web. 15 Nov. 2010.

History of Plant Physiology - Biology Encyclopedia - cells, body, function, process, animal, life, hormone, used, structure." Biology Reference. N.p., n.d. Web. 15 Nov. 2010. < http://www.biologyreference.com/Gr-Hi/History-of-Plant-Physiology.html#ixzz15DHziLNg>.

"Stephen Hales." NNDB: Tracking the entire world. N.p., n.d. Web. 15 Nov. 2010. http://www.nndb.com/people/146/000085888/

Thank you for listening!

14Yeah!Lil Jon/Ludacris/UsherConfessions, track 22004Soul and R&B18337.91