Articles > Leaf definition – quiz Leaf definition – quiz Quiz Choose the best answer. 1. What is the main function of a leaf? Photosynthesis Support Storage 2. Present in a true leaf? Xylem Phloem Xylem and phloem 3. The green pigment Chloroplast Chlorophyll Carotenoid 4. Accessory pigment Chloroplast Chlorophyll Carotenoid 5. The outermost layer of the leaf Epidermis Stomata Mesophyll Send Your Results (Optional) Your Name To Email Time is Up!