11. What is the main source of natural fluoride?

A. Mushrooms
B. Potatoes
C. Meat
D. Water

12. Which of the following mineral is involved in the enzyme -controlled energy-yielding reactions of metabolism?

A. Calcium
B. Phosphorus
C. Iron
D. Copper

13. The mineral which aids in the utilization of iron and in hemoglobin synthesis is

A. calcium
B. phosphorus
C. cobalt
D. copper

14. The mineral which is considered important in maintaining electrical potential in nerves and membranes is

A. magnesium
B. manganese
C. calcium
D. iron

15. Wilson’s disease is an example of __________ and Menkes’ syndrome is an example of __________ .

A. zinc deficiency; zinc toxicity
B. zinc toxicity; zinc deficiency
C. copper deficiency; copper toxicity
D. copper toxicity; copper deficiency