KEY CONCEPT Photosynthesis converts light energy is captured and used to build sugars that store chemical energy.

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KEY CONCEPT Photosynthesis converts light energy
is captured and used to build sugars that store
chemical energy.
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• The equation for the overall process is
• 6CO2 6H2O ?????? C6H12O6 6O2

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Photosynthesis in plants occurs in chloroplasts.

• Photosynthesis occurs in a series of stages in
  the chloroplasts.
• grana (thylakoids)- photosystem II, photosystem I
  and the electron transport chain.
• Stroma- Calvin Cycle

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The first stage of photosynthesis captures and
transfers energy.

• The light-dependent reactions include groups of
  molecules called photosystems.

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• Photosystem II captures and transfers energy.

• 1.chlorophyll absorbs energy from sunlight
• energized electrons enter electron transport
  chain
• 2.water molecules are split
• oxygen is released as waste
• 3.hydrogen ions are transported across thylakoid
  membrane

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• Photosystem I captures energy and produces
  energy-carrying molecules.

• 4.chlorophyll absorbs energy from sunlight
• 5.energized electrons are used to make NADPH
• NADPH is transferred to light-independent
  reactions

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• The light-dependent reactions produce ATP.

6.hydrogen ions flow through a channel in the
thylakoid membrane 7.ATP synthase attached to the
channel makes ATP
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The second stage of photosynthesis uses energy
from the first stage to make sugars.

• Light-independent reactions occur in the stroma
  and use
• CO2 molecules enter the Calvin cycle

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• The light-independent reactions make sugars.

• take place in stroma
• needs carbon dioxide from atmosphere
• use energy to build a sugar in a cycle of
  chemical reactions

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• A molecule of glucose is formed as it stores some
  of the energy captured from sunlight.

1.carbon dioxide molecules enter the Calvin
cycle 2.energy is added and carbon molecules are
rearranged 3.a high-energy three-carbon molecule
leaves the cycle
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• A molecule of glucose is formed as it stores some
  of the energy captured from sunlight.

• 4.two three-carbon molecules bond to form a sugar

• remaining molecules stay in the cycle

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