<prompt> Elimination of waste product from a normal person requires minimal amount of urine of100 ml500 ml100 ml2000 ml  <response>: Ans. b 500 mlRef: Ganong, 25th edp.685A normal 70kilogram human must excrete about 600mOsm of solute every dayWe know that the maximum concentrating ability of kidney is 1200mOsmSo, the minimal volume of urine that must be excreted is 60012000.5Lday or 500 mldayThis 500 mlday is needed to excrete 600mOsm of solute 