F214 OCR Biology: Photosynthesis

Photosynthesis summary


Autotroph = Obtain carbon as carbon dioxide, and energy from
Photosynthesis sun light
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…

Light Dependent Stage
Light energy is converted to
Electron carriers chemical energy
Electron carriers
2e- In the form of ATP and reduced NADP
2e-
H2 O
2e- ATP is made when ADP & Pi combine
1/2O2 2e- 2H+ + NADP
ADP
+ Pi This is called phosphorylation
2H+ Reduced

2e-…

Light Independent Stage

CO2
Unstable
RuBP intermediate
Ribulose bisphosphate RUBISCO 6C
5C (Ribulose
Biphosphate
carboxylase)
ADP + Pi




ATP
Calvin 2 x GP
glycerate

RuP cycle Reduced
3-phosphate
(3C)
Ribulose phosphate
5C NADP

NADP
2 x TP
Carbohydrates triose ATP
phosphate
Lipids (3C) ADP + Pi
Amino acids



1. CO2…

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…