A limiting factor is a factor that controls a process. Light intensity, temperature and carbon dioxide concentration are all factors which can control the rate of photosynthesis. Usually, only one of these factors will be the limiting factor in a plant at a certain time. This is the factor which is the furthest from its optimum level at a particular point in time. If we change the limiting factor the rate of photosynthesis will change but changes to the other factors will have no effect on the rate. If the levels of the limiting factor increase so that this factor is no longer the furthest from its optimum level, the limiting factor will change to the factor which is at that point in time, the furthest from its optimum level. For example, at night the limiting factor is likely to be the light intensity as this will be the furthest from its optimum level. During the day, the limiting factor is likely to switch to the temperature or the carbon dioxide concentration as the light intensity increases.
For green plants, including algae, the action spectrum shows that most
photosynthetic activity takes place in blue-violet and orange-red
lights since these are the colours which are mostly absorbed by the
main chlorophylls and the carotenoids.
action spectrum for photosynthesis? | Yahoo Answers
The light-independant reactions of photosynthesis occur in the stroma of the chloroplast and involve the conversion of carbon dioxide and other compounds into glucose. The light-independent reactions can be split into three stages, these are carbon fixation, the reduction reactions and finally the regeneration of ribulose bisphosphate. Collectively these stages are known as the Calvin Cycle.
Start studying Action & Absorption Spectra
We can see how different wavelengths of light affect photosynthesis by
looking at action spectra.
The rate of photosynthesis for all the wavelengths of ..
This data was compared to that of the standard action spectrum for photosynthesis of visible light (this profiles the relative effectiveness of different wavelengths of radiation in driving the process of photosynthesis).
Sustainability and interdependence
When we started this lab, we expected the highest rates of photosynthesis to be at the wavelengths of 475 nm (blue light) and 650 nm (red light), and the lowest to be at 510 nm (green light) and 570 nm (yellow light) due to the action spectrum of visible light.