Does stomata open and close if the CO2 consentration decrease?
Yes, the concentration of CO2 will have an effect on the number of open and closed stomata. This is due to the fact that when the stomata are open water will evaporate and the plants will close their stomata to preserve water when they do not require them to be open for photosynthesis or gas exchange when there is not a sufficient concentration of CO2 to keep up photosynthesis.
