18.4 Which of the following statement(s) is (are) true about excretion in human beings?
I. Kidneys are the primary excretory organs.
II. The bladder is muscular, so it is under nervous control.
III. Each kidney has large numbers of filtration units called nephrons.
IV. Urine is stored in the urethra until the urge of passing it out.
(a) I and II only (b) I and III
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Answer:
I and III only
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