Why cant gases move freely inside the leaf?

Gases cannot move freely inside a leaf primarily due to the presence of mesophyll cells and the structure of the stomata. The mesophyll cells are packed closely together, creating a barrier that restricts the free movement of gases. Additionally, stomata, the tiny openings on the leaf surface, regulate gas exchange by opening and closing, which controls the flow of gases like carbon dioxide and oxygen into and out of the leaf. This regulation is essential for maintaining the plant's internal environment and optimizing photosynthesis.