limiting factors on photosynthesis rate
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16 Terms
environmental factors (6)
amount of light
level of CO2
temperature
levels of water
pH
inhibition of enzymes
light intensity
rate of photosynthesis increases exponentially until a maximum rate is achieved
at this point, increasing light intensity has no effect as the rate of photosynthesis reaches a plateau
CO2 effect on rate
as Co2 increases, rate increases
CO2 in high concentrations effect on rate
rate stays more constant as there limiting factors change to things other than CO2
temperature effect on rate
increases rate as enzyme activity is better
but exceeding optimum decreases rate bc enzymes denature
what is an action spectrum
profiles the effectiveness of different wavelength lights in fuelling photosynthesis
how is an action spectrum obtained
plotting the wavelength against some measure of photosynthetic rate (eg co2 production)
main limiting factors (4)
light intensity
CO2 concentration
temperature
chlorophyll concentration
how to tell which factor controls rate
the factor furthest from its optimum level for photosynthesis will control the amount of photosynthesis that takes place
CO2 differences in C3 C4 CAM plants
C4 and CAM are less impacted by changes
water differences in C3 C4 CAM plants
C4 and CAM are less impacted by changes
how does light intensity affect CO2 output
lowers [CO2]
CO2 is a reactant so if there is a higher light intensity, meaning higher photosynthesis rate, more CO2 will be used so there is a lower level of CO2
light compensation point
rate of photosynthesis = rate of cellular respiration
O2 produced = O2 used
CO2 produced = CO2 used
light saturation curve
type of graph that maps photosynthesis and cellular respiration output / input levels
what is the difference between total and net in a light saturation curve
total values need to consider the range between the negative and the positive values
net values need to consider just from 0 to the side being measured (usually what is displayed in the y axis)
what does a high light intensity allow for
more photosynthesis as more water is being split (LD stage produces more loaded enzymes)