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Quick Quiz. What is ATP made from? What is the GCSE photosynthesis equation? What is a grana? Tricky one… Why is chlorophyll green?. Photosynthesis. 3. We can still view photosynthesis as a whole process. .

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Quick Quiz

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Quick quiz

Quick Quiz

  • What is ATP made from?

  • What is the GCSE photosynthesis equation?

  • What is a grana?

  • Tricky one… Why is chlorophyll green?


3 we can still view photosynthesis as a whole process

Photosynthesis

3. We can still view photosynthesis as a whole process.

  • The light dependent reaction (LDR) and the light independent reaction (LIR) link together.

  • The LDR uses water and produces oxygen.

  • The LIR uses carbon dioxide and produces glucose.

carbon dioxide + water  glucose + oxygen


Light dependent reaction

Light dependent reaction

  • Describe the main stages in the light dependent reaction

  • Explain how energy produced during the light dependent reaction is harvested in photosynthesis.

  • Relate the chemistry of the light dependent reaction to the GCSE photosynthesis equation.


Quick quiz

Light dependent reaction

Chlorophyll extracted from spinach under blue light.


Quick quiz

Light dependent reaction

  • The chlorophyll fluoresces red because the electrons within it are ‘excited’. When excited they emit energy in the form of red light.


Quick quiz

The light dependent reaction

  • http://www.youtube.com/watch?v=v590JJV96lc


Quick quiz

The light dependent reaction


Quick quiz

Key points of the LDR

  • Takes place on the thylakoid membrane.

  • Photosystem II comes before

    photosystem I.


Quick quiz

Key points of the LDR

Photosystem II

-Light hits PS II chlorophyll molecule.

-Electrons are excited and pass onto electron carrier.

-Electrons are then passes along the electron transport chain.

-Electron lose energy as they pass to each carrier.

-This energy is used to drive ATP synthesis.

-But PS II has lost electrons. These are given back to PS II by the photolysis of water.

H2O  ½ O2 + H2 + 2 e-


Quick quiz

Key points of the LDR

Photosystem I

-Light hits PS I chlorophyll molecule.

-Electrons are excited and pass onto electron carrier.

-Electrons are then passes along the electron transport chain.

-Electron lose energy as they pass to each carrier.

-This energy is used to drive NADPH production

-But NADPH production also requires H+ ions.

These come from the photolysis of water.


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