Answer:
(a)
Nephron is the filtering unit of kidney.(1) (b) It is so called because it
filters the blood and removes the poisonous nitrogenous wastes like urea, uric
acid and excess of water from it. These harmful products get filtered and
useful products are reabsorbed by tubular part of nephron. Thus, harmful waste
is excreted out as urine from the body. (1)
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