photosynthesis (autotrophic nutrition) how to plants make energy for themselves?
TRANSCRIPT
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Photosynthesis(Autotrophic Nutrition)
How to plants make energy for themselves?
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What is Photosynthesis
• Photosynthesis: process of using solar energy to generate glucose that plants can use to make energy.
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Where does photosynthesis take place?
• Chloroplast: site for photosythesis– Contains chlorophyll: pigment that
activates photosynthesis & gives plants their green color
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Stages of Photosythesis
• Light Reactions needs the sun and water
• Dark Reaction no light needed
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Important parts of the cholorplastThykloids: site of Light rxns.
Grana: a bunch of thykloids
Stroma: site ofDark rxns.
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• Light is used in order for split water in the thykloids.
• CALLED PHOTOLYSIS• Water molecule is split• Oxygen is freed into the atmosphere• Two hydrogen atoms from molecules drive:
NADPNADPHADP ATP
• These two high energy molecules go into stage 2 of photosynthesis
Step 1- Light Reactions
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Copy and paste into browser
• http://www.stolaf.edu/people/giannini/flashanimat/metabolism/photosynthesis.swf
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Step 2: Dark Reactions (PS1)
• Light is not required
• Takes place in the stroma
• Given the name CARBON FIXATION (Calvin Benson Cycle) BECAUSE IT WILL NOW FIX CARBON DIOXIDE CHEMICALLY TO FORM GLUCOSE
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Copy and paste link into browser to observe dark reaction
• http://www.compulink.co.uk/~argus/Dreambio/photosynthesis/photosynthsis%20animation.htm
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Overall Chemical Equation
• 6 CO2 +12 H2 O+ LIGHTC6 H12 O6+6 O2 + 6H2O
• REVERSE OF CELL RESPIRATION