Photosynthesis

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Photosynthesis

• Mrs. Schenfields
• Life Science

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(No Transcript)
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What is photosynthesis?

• Process plants use to make their own food
• Plants leaves contain chlorophyll
• Chlorophyll (green color) makes photosynthesis
  possible

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Definition and equation of photosynthesis.

• Light energy captured and stored as chemical
  potential energy in the covalent bonds of
  carbohydrate molecules
• 6 CO2 6 H2O light ? C6H12O6 6 O2

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PhotosynthesisReactants Products
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Chloroplast organelle that performs
photosynthesis.
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Step I Light Reactions
Involves the splitting of water (photolysis) 12
H2O Energy ? 6 O2 24 H 24e- Requires
light for the energy to split the water
molecule Also forms a highly energetic compound,
adenosine triphosphate (ATP)
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Light-Dependent Reaction Summary
Water and Light are converted into ATP
NADPH. Occurs in the Thylakoid Membrane. Oxygen
is released as a waste product. NADPH an energy
(electron) carrying molecule
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Overview of the Dark Reactions

• Carbon dioxide is broken and fixed into glucose
  or fructose molecules in the CALVIN CYCLE!!!!
• Glucose subunits can make cellulose or other
  polysaccharides, such as fruit sugars.
• The carbon skeleton in glucose also helps to
  synthesize other important biochemical compounds
  such as, lipids, amino acids, and nucleic acids.

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Overview of Photosynthesis