This biology document outlines a lesson on leaf structure, with the objectives of differentiating between monocot and dicot leaves and identifying the parts of a dicotyledonous leaf. Key terms are defined for monocotyledon, dicotyledonous leaf, upper epidermis, palisade mesophyll, spongy mesophyll, vascular bundle, and stomata. Students are directed to online resources to view diagrams of leaf cross-sections and identify how leaf parts are adapted for photosynthesis.