Blade (Lamina): The broad, flat main section designed to absorb maximum sunlight. Petiole: The small stalk connecting the leaf blade to the plant stem. Veins (Vascular System): Network of thin tubes distributing water, nutrients, and sugars throughout the leaf, dominated by a central midrib. Stomata: Microscopic pores primarily on the underside that regulate oxygen, carbon dioxide, and water vapor exchange. Cuticle: A protective, waxy outer layer that prevents excess water loss.