HL Unit 9
The tissues main that are found in a mesophytic leaf are epidermal tissue, vascular and ground tissue. The main part of a leaf is the blade of the lamina; it consists of a large surface area for photosynthesis but is only 0.3mm thick it composes of four thin tissues of layers with veins at intervals. Leaves most important task is photosynthesis that why leaves are flat and wide. So the most important tissue in a leaf is the palisade and the spongy mesophyll.
The epidermal tissue is the tissue that surrounds and protects the leaf. The epidermal tissue has two parts to it; there is an upper tissue and a lower tissue that server different function. The upper epidermal tissue is a continuous layer of cells covered by a thick waxy cuticle, it prevents water loss from the upper surface even when heated by sunlight, regulates gas exchange and absorbs mineral nutrients and water that happens to pour upon it and.