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

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