Light dependant stage

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6 Terms

1
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where does the light dependant stage take place?

in the granum

2
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Stage 1 -photolysis of H2O

  • H2O is broken down via an enzyme in PS2

  • broken down into H+, 2e and oxygen produced is used in respiration

  • the enzymes trap light energy for photolysis

3
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Stage 2 - cyclic phosphorylation

  • Oxygen produced in stage 1 is used to produce ARP

  • ADP + Pi = ATP (using sunlight)

4
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Stage 3- Formation of NADH

  • the coenzyme NAD is reduced into NADH ( by adding 2 H+ ions)

5
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What happens is respiration rate < photosynthesis

this leads to an oxygen build-up and oxygen leaves the plant via the stroma

6
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Products of the light dependant stage

  • NADPH

  • ATP