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. Which of these is not a normal constituent of urine: sugar, urea or creatinine?   Creatinine   Sugar   Urea   Half-n-half Clue   3. Which is not true regarding kidneys? A. They do not have any capsule. B. They are bean shaped and reddish brown in color. C. Each kidney is divided into 2 parts - cortex and medulla. D. They are the main excretory organs.   A   B   C   D   Half-n-half Clue   4. True or false: Kidneys contain 10-12 million nephrons.   True   False   5. True or False: Malpighian body is a part of nephron.   True   False   6. Identify urethra in this diagram.   1   2   3   4   Half-n-half Clue   7. True or false: Capsule in which glomerulus is enclosed is known as external capsule.   True   False