1) Excretion is a) removal of blood b) removal of excretory substances c) both d) none of these 2) Main excretory organ of man is a) kidney b) liver c) nephridia d) malpighian tubules 3) Organs which help in excretion in human beings are a) kidney and lungs b) kidney, lungs, heart c) kidney, lungs, skin, liver d) lungs, urinary bladder, stomach, 4) Main excretory substance in human beings is a) uric acid b) ammonia c) Urea d) carbon dioxide 5) Ammonia is converted into urea in a) kidney b) liver c) urinary bladder d) pancreas 6) Uric acid is excreted in a) Birds and reptiles b) Man c) Frog and fishes d) amoeba, paramaecium 7) Excretion in insects occurs by a) nephridia b) kidney c) skin d) malpighian tubules 8) In human beings, urine reaches urinary bladder through  a) kidney b) urinary tubes c) veins d) arteries 9) Excretory substances reach kidney through a) artery b) vein c) both d) none of these 10) Due to excess urea in body, the condition is called a) ureroma b) ammonoma c) diabetes d) uremia

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