1. Which of these is not true -- A, B, C or D? A. Kidney excretes urea. B. A small fraction of CO2 is removed through the skin. C. Small amount of salt is excreted through skin. D. Feces is excreted through the anus.   A   B   C   D   Hint Half-n-half Clue   2. Identify urethra in this diagram.   1   2   3   4   Half-n-half Clue   3. Tuft of capillaries inside the Malpighian body is known as   Nephron   Glomerulus   Renal artery   Collecting ducts   Half-n-half Clue   4. Formation of urea occurs in   Liver   Small intestine   Kidneys   Pancreas   Half-n-half Clue   5. Which of these is not a function of kidneys? A. Maintenance of acid base balance. B. Excretion of nitrogenous waste products. C. Temperature regulation. D. Maintenance of water balance.   A   B   C   D   Half-n-half Clue   6. True or false: Kidneys contain 10-12 million nephrons.   True   False   7. Which of these is not a normal constituent of urine: sugar, urea or creatinine?   Sugar   Urea   Creatinine   Half-n-half Clue