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Content: What causes changes in rate of photosynthesis? There are three rate-dependant factors: light, concentration of
carbon dioxide and temperature. with light, less sun= less photosynthesis, more sun= more
photosynthesis. This is because there is a 'light dependant
reaction' as part of photosynthesis, and therefore photosynthesis
can only happen when there is enough light. CO2 is needed for photosynthesis. The more co2, the faster the
rate of photosynthesis. Increasing the Temperature increases the rate. This is because
there are enzymes in the process of photosynthesis, and with
enzymes, the rate increases with temperature (up to a point, when
it is too hot for the enzymes to work). What is the relationship between an increase in light intensity and photosynthetic rate in tomato leaves?