How is the leaf involved in excretion from a plant?

The leaf plays a role in a plant's excretion primarily through the process of transpiration, where water vapor is released from small openings called stomata. While the leaf mainly facilitates gas exchange, it can also expel certain waste products, such as oxygen and volatile organic compounds. Additionally, some plants excrete excess salts through specialized glands or by shedding leaves, effectively utilizing leaves as a means to manage waste.