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Photosynthesis Review

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by

Holly Westwood

on 2 April 2013

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Transcript of Photosynthesis Review

Photosynthesis
Review Photosynthesis Light Reactions Explained Calvin Cycle Explained 6 CO + 6 H O + Light Sucrose + 6 O Occurs in the thylakoid membrane Photosystem II absorbs light energy, which excites electrons
The excited electrons move through the electron transport chain to Phtosystem I Electrons then attach to the energy carrier NADP+, forming NADPH The high concentration of H+ (being released by Photosystem II and the electron transport chain)inside thylakoid powers ATP synthase, producing ATP Occurs outside thylakoids, in the stroma C4 and CAM Plants Overall Photosynthesis has Two Stages Light Reactions Calvin Cycle http://media.pearsoncmg.com/bc/bc_0media_bio/bioflix/bioflix.htm?9apphotosynthesis Click on link to see a helpful review video from the AP book's website Close up of Photosystems Chloroplasts Where photosynthesis occurs Results of Changing Environmental Factors on the Rate of Photosynthesis Converts Light Energy into the Chemical Energy of food Each CO molecule enters one at a time, and undergoes Carbon Fixation
Next the molecule in reduced into G3P
G3P is
a sugar
used to make other organic compound (like glucose) and carbohydrates 6 CO + 6 H O + Light Sucrose + 6 O Light Reactions Calvin Cycle ATP
NADPH ADP
NADP+ ATP
NADPH ADP
NADP+ Effect of changing light intensity Effect of changing carbon dioxide concentration Effect of changing carbon dioxide
concentration The energy from sunlight is in the form of Electromagnetic Energy Chloroplasts contain molecules called chlorophyll which absorb the visible light part of the electromagnetic spectrum The chlorophyll absorbs violet-blue and red light (which are most effective in photosynthesis), and reflects or transmits green light Plants that have evolved in hot, dry climates to reduce the amount of photorespiration that takes place Mesophyll Cell 2 2 2 Electrons from H O are also taken, resulting in O which exits through the stomata 2 2 2 2 2 2 Requires NADPH and ATP (result of light reactions)
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