1. Electron micrograph of mitochondria Compare the number of this organelle in a liver cell and in a fat cell. Explain the difference. Fig. 1

2. Lenticel of a woody dicot stem What is the significance of lenticels? Fig. 2

3. Vertical section of a dicot leaf showing stomata and guard cells What are the gases going out of the stoma during the day and at night? Compare the degree of opening of the stoma under strong light and in the dark. Fig. 3

4. Vertical section of a dicot leaf showing the various layers Identify the cuticle, epidermis (upper and lower), palisade mesophyll and spongy mesophyll, and the leaf vein. How is the leaf structure adapted for gaseous exchange? Fig. 4

5. Vertical section of a floating leaf How is the leaf structure adapted to the natural habitat of the plant? Fig. 5

6. Cactus How are the leaves and stems of the plant adapted for the natural habitat of the plant? Fig. 6

7. Cross-section of a dicot stem Identify the phloem and xylem tissue in the vascular bundle shown in the figure. What are their functions? Fig. 7

8. Cross-section of a dicot root Identify the xylem and the phloem. How do you know that this is a root section? Fig. 8

9. Vertical section through the xylem to show the xylem vessels How are the xylem vessels structurally adapted for its function in transport? Fig. 9

10. Woody stem showing annual rings How are the annual rings formed? Fig. 10

11. Swollen gum of a scurvy patient What is deficient in the patient diet that leads to scurvy? Fig. 11

12. The bone structure of a patient with osteoporosis (having reduced bone materials) What mineral is insufficient in the patient’s diet? Fig. 12

13. Vertical section of human ileum showing villi How is the structure of villi adapted for absorption of fats? Fig. 13

14. Section through the lung to show alveoli and capillaries among alveoli How is the structure of alveoli adapted for gaseous exchange? How is the presence of capillaries helpful in gaseous exchange? Fig. 14

15. A human blood smear showing red blood cells and two types of white blood cells How is the red blood cells adapted for transport of oxygen? What is the function of the white blood cells? Fig. 15

16. An artery and a vein Give one observable feature in the figure to distinguish between and artery and a vein. Fig. 16