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. 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   4. Tuft of capillaries inside the Malpighian body is known as   Collecting ducts   Nephron   Renal artery   Glomerulus   Half-n-half Clue   5. True or false: Kidneys contain 10-12 million nephrons.   True   False   6. Formation of urea occurs in   Small intestine   Pancreas   Liver   Kidneys   Half-n-half Clue   7. Which of these is not a normal constituent of urine: sugar, urea or creatinine?   Sugar   Creatinine   Urea   Half-n-half Clue