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. Main function of the _______ is to filter the wastes from the blood and excrete them in the form of urine.   Urinary Bladder   Kidneys   Endocrine glands   Lungs   Half-n-half Clue   3. Which of these is not an excretory organ: intestine, lungs, thyroid or kidneys?   Kidneys   Lungs   Thyroid   Intestine   Half-n-half Clue   4. True or false: Kidneys contain 10-12 million nephrons.   True   False   5. True or false: Capsule in which glomerulus is enclosed is known as external capsule.   True   False   6. Which of these is not a normal constituent of urine: sugar, urea or creatinine?   Sugar   Urea   Creatinine   Half-n-half Clue   7. Tuft of capillaries inside the Malpighian body is known as   Nephron   Glomerulus   Renal artery   Collecting ducts   Half-n-half Clue