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Photosynthesis



The carbon dioxide enters the plant by stomata (in the leaves) or lenticels (in the stem). The water enters through
the roots and moves up through the plant in xylem vessels. Light is required as an energy source for the reaction
and chlorophyll is necessary to absorb the light.…

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Light dependant reactions:

1. Energy from light raises 2 electrons in each chlorophyll molecule to a higher energy level. The electrons
then leave the excited chlorophyll molecules.

2. The electrons pass along the embedded electron transport chain in the thylakoid membranes.

3. The electrons pass from one carrier protein to…

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Note:No ATP has been made during this process.

Cylic Photophosphorylation

However, if there is plenty of NADPH, something different happens.

The electron from PS I is passed to the electron carriers used in PS II. ATP is formed and the electrons return to PS
I to fill the space. This…

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4. The rest of the
GALP's are used to regenerate the RuBP using the phosphate from ATP.




For every twelve 3-carbon sugars (36 carbons):

Two of the 3-carbon sugars form 1 x 6-carbon sugar (6 carbons)

Ten of the 3-carbon sugars form 6 x 5-carbon sugars (RuBP) (30 carbons)

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