Stomatal movement is not affected by

Stomatal movement is not affected by $O_2$ concentration. Stomata are tiny pore found in the epidermis of leaves and other soft aerial parts. They are meant for the gaseous exchange and are also the main source of transpiration. Stomatal movements are affected by many factors like light, temperature and $C{O}_2$ concentration, In the majority of plants, the stomata are open in light and close in darkness. Normally high temperature above $30°C$ reduces stomatal opening in many species. Low $C{O}_2$ concentration usually induces opening of stomata while high $C{O}_2$ concentration closes the same.