discovery of photosynthesis. photosynthesis: is the process by which sunlight energy is transferred...
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Discovery of Photosynthesis
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•Photosynthesis: Is the process by which sunlight energy is transferred into chemical energy stored in organic compounds.
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Organelle Responsible for Photosynthesis•Chloroplast: Organelle where
photosynthesis takes place.
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Chloroplast Pigments
•Pigments: Are compounds that absorbs light.
•Located in the thylakoids are pigments called, chlorophylls.
•Most common chlorophylls▫Chlorophyll a ▫Chlorophyll b (accessory pigment)
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Chloroplast Pigments
•Chlorophyll a▫Directly involved in light reactions of
photosynthesis•Chlorophyll b
▫Assist chlorophyll a in capturing light energy
•Carotenoids▫Accessory pigment
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Chloroplast Pigments
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Discovery of Photosynthesis
•Jan Van Helmont- Looked at plant mass. •Where does a plant’s mass come from? •Mass came from water and CO2 in the air.
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Discovery of photosynthesis
•Joseph Priestley•Looked at the products that plants give
off and found that plants give off oxygen. •
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Photosynthesis Equation
• Carbon Dioxide + Water + Sunlight Food and Oxygen
•6CO2 + 6H2O+ Sunlight C6H12O6 + 6O2
Reactants: Go into the chemical reaction
Products: Substances that are formed from the reaction
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Autotrophs vs Heterotrophs
•Autotrophs: Organisms that can make their own food (Plants)
•Heterotrophs: Organisms that need to take energy from the foods they eat. (Animals)
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Energy-Storing Compounds
•Two types of Energy Compounds ▫NADP+ NADPH ▫Adenosine Triphosphate (ATP)
•Energy Levels ▫AMP (Low Charge)▫ADP (Half Charge)▫ATP (Full Charge)
AMP ADP ATP