OCR Biology A-Level Factors Affecting Photosynthesis Summary

Calvin Cycle
:


CO2
RuBisCO
-Ru BP I
A
-

Unstable intermediate




A
TP TP
lipids ap ATP
+


,


r 2x
Glucose ,
r

amino acids NADPH




limiting factors limit :
the rate of photosynthesis
Needed
light intensity as an
energy produce NADPH and ATP
·
:

source to

Carbon dioxide Needed for carbon fixation produce GP TP
·
:

as a source to or
·
Temperature Increases rate of enzyme controlled reactions
:




↳ water factor would and stop
Not a
limiting
because the stomata
just close photosynthesis
:




and
light intensity the Calvin
cycle :




Reduced light reduces light dependent reaction ratee... less ATP and NADPH available
intensity
·




·

NADPH and ATP are needed to convert Gp to TP :: more GP and less TP

TP needed RuBP RuBD
is to
regenerate : less
·




Carbon dioxide concentration and the Calvin Cycle :




CO2 needed to form up and iP ... Less GP and TP
·




·


CO2 is not needed to form Rup from TP ... more RuBP



Temperature and the Calvin Cycle :




All reactions are
catalysed by enzymes
lower temperature less linetic
energy
:.. less
enzyme activity
· =




very high temperature enzymes denature
·

=




·

Less GP TP and RuBP
,