PHOTOSYNTHESIS

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PHOTOSYNTHESIS
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Energy

• Stored in chemical bonds of compounds.
• Compounds that store energy ATP, and NADPH.
• When bonds are broken, energy is released.

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ATP

• Chief energy storing molecule.
• Made of Adenine, Ribose, Phosphates
• Used for
• Mechanical functions
• Active transport
• Breakdown/synthesis of large molecules
• Regenerates

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Sources of Energy

• Autotrophs
• can make own food
• photosynthesis
• producers
• Heterotrophs
• get food from others
• consumers

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PHOTOSYNTHESIS
The process by which autotrophs (plants)
convert sunlight into a usable form of energy.
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Leaves contain an important pigment called
chlorophyll.
Chlorophyll absorbs red, blue and violet
wavelengths of light from the sun and reflects
the color green.
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Chlorophyll is located in an organelle called
chloroplast.
Chloroplast carries out the process of
photosynthesis
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3 structures of chloroplast
Thylakoid (single disks that absorb energy act
like tiny batteries)
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Grana (stacks of thylakoid)
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Stroma gel-like material that lies between
the stacks of grana and acts as an insulator.
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2 cycles for Photosynthesis
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• 1. Light-Dependent Reactions (light phase) -
• Occurs in the grana.
• Leaf takes in sunlight water together with
  ADP NADP.
• Makes ATP, oxygen and NADPH.

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• Light-Independent Reactions
• or Calvin Cycle (dark phase)-
• Occurs in the stroma.
• Needs carbon dioxide.
• Uses ATP NADPH for energy hydrogen.
• The end product is glucose which is stored as
  starch if not used immediately.

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Chemical Equation for Photosynthesis
sunlight
6 CO2 6 H2O 6 O2 C6H12O6
Carbon dioxide water sunlight (yields) oxygen
glucose
How does this relate to Cellular Respiration?
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PHOTOTROPISM

• Response to light