👉 Leaf fluid, also known as mesophyll fluid, is a vital component of the plant's internal transport system, specifically within the mesophyll cells of leaves. It is a clear, watery substance that fills the intercellular spaces between the palisade and spongy mesophyll cells. This fluid plays a crucial role in the diffusion of gases, such as carbon dioxide and oxygen, and the transport of nutrients and organic compounds throughout the leaf. It also contains enzymes that facilitate metabolic processes, including photosynthesis, and helps maintain cellular turgor pressure, which is essential for the leaf's structural integrity and movement.