photosynthesis using light energy to make food photosynthesis plants use energy to change carbon...
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Photosynthesis
Using Light Energy to Make Food
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Photosynthesis
Plants use energy to change carbon dioxide and water into glucose and oxygen (waste product)
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Who performs Photosynthesis?
Plants and a few bacteriaThese are called autotrophs
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Three major events take place in two stages:– Absorption of light energy– Conversion of light energy into
chemical energy (ATP and NADPH)– Storage of energy in the form of
carbohydrates
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Where does it happen?
Chloroplasts:– Thylakoids (a single
pancake) Contain chlorophyll
– Grana (stacks) Granum is one stack.
– Stroma (thick fluid that surrounds the grana)
omega.dawsoncollege.qc.ca/ ray/cell/401cell.htm
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Light Dependent Reaction– Temperature
independent– Light Reaction
Light Independent Reaction– Calvin-Benson Cycle– Dark Reaction
www.emc.maricopa.edu/faculty/ farabee/BIOBK/BioBookPS.html
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Light Reaction
Requires direct light energy Occurs in the thylakoids of chloroplasts 2 steps occur here:
1. Absorption of light by pigments
2. Splitting of water
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Electron carriers
Light dependent reaction They gain tons of energy! Cells use electron carriers to transport this energy
to other molecules– Called electron transport (name of process)
2 types in photosynthesis– NADP+
Carriers 2 high energy electrons and hydrogen ions Create NADPH
– ATP
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Light Dependent Reaction (depends on light)
Inputs=sun and waterProducts formed
– Oxygen gas-formed by splitting water– Electrons transported to create
NADPH and ATPused in the Calvin-Benson cycle
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Calvin Cycle
Occurs in the stroma (filler in chloroplasts)Also called the dark reaction
– Carbon dioxide is the input and the NADPH and ATP from the light reaction
The output is glucose– It is used for food and energy.– Formula for glucose
C6H12O6
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The Equation
Sunlight+ 6CO2 + 6H20
---->C6H12O6 + 6 02
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Factors that effect the rate of photosynthesis
Temperature Enzymes are important for photosynthesis to work.
– Enzymes work best in certain temperatures.– If the temp is too low or too high, it can decrease it or stop
photosynthesis.
Light intensity– Increase light will increase photosynthesis to a point.
Amount of Carbon Dioxide Amount of water
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