F214 OCR Biology: Photosynthesis

F214 OCR Biology: 

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  • Created by: Hamed
  • Created on: 15-06-11 11:25
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Photosynthesis summary
Autotroph = Obtain carbon as carbon dioxide, and energy from
Photosynthesis sun light
energy + 6CO2 + 6H2O = 6O2 + C6H1206
Heterotroph = Obtain both carbon and energy from complex
organic molecules
Needed in aerobic Used as
Released as respiration to respiratory
waste product release energy substrate by
from respiration from carbohydrate plants and
Two stage process, taking place inside chloroplasts
Light dependent stage ­ takes place on thylakoid
Light independent stage ­ takes place in stroma of
(NB ­ both stages are linked, so if the Ldep stage
stops so does the Lind stage)
Photosynthetic pigments
Different pigments absorb different
wavelengths of light.
The graph shows the absorption spectrum.
Where the y-axis is rate of photosynthesis it is
called an action spectrum
The pigments allow the plants to make use of a range wavelengths of light.

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Light Dependent Stage
Light energy is converted to
Electron carriers chemical energy
Electron carriers
2e- In the form of ATP and reduced NADP
H2 O
2e- ATP is made when ADP & Pi combine
1/2O2 2e- 2H+ + NADP
+ Pi This is called phosphorylation
2H+ Reduced
2e- ATP
NADP Because, in this case, light is needed,
Photosystem I
Light P700 (NADPH + H+)
energy Photosystem II
this is called photophosphorylation
Light When light hits chlorophyll molecules
Light they become excited…read more

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Light Independent Stage
RuBP intermediate
Ribulose bisphosphate RUBISCO 6C
5C (Ribulose
ADP + Pi
Calvin 2 x GP
RuP cycle Reduced
Ribulose phosphate
2 x TP
Carbohydrates triose ATP
Lipids (3C) ADP + Pi
Amino acids
1. CO2 diffuses into the stroma and reacts with ribulose bisphophate
2. This reaction is catalysed by the enzyme rubisco
3. Glycerate-3-phosphate (GP) is formed
4. GP is then reduced to triose phosphate (TP)
5.…read more

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Limiting Factors
(The effects of changing the concentrations of light intensity, CO2 and temperature)
1. At low light intensities increasing the
intensity increase the rate.
2. At high light intensities this has no effect
3. Another factor is limiting
4. This also applies to CO2 concentration
5. Increasing the temperature at low light intensities has little effect
6. Because light intensity is the main limiting factor.
7.…read more


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