Answer:
(a)
Leaves Plants can accumulate some of their waste in leaves. These leaves fall
off and the plant gets rid of the waste. (1)
(b) Renal artery It performs a very important function in filtering the
blood in human beings.
It brings impure blood containing waste substances into
the kidneys for filtration. (1)
(c) Kidney It is the main excretory organ in human beings.
It removes the poisonous nitrogenous substance like urea or uric acid, other
waste salts and excess of water from the blood and excrete them in the form of
a yellowish liquid called urine. (1)
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