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(i) Mention two secondary sexual charact...

(i) Mention two secondary sexual characteristics in human male.
(ii) Why testis in male body are extra-abdominal?
(iii) Write the dual purpose served by urethra in males?

Text Solution

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(i) Hair growth on face, chest, armpit and genital area/ body becomes muscular/voice becomes deep and coarse / penis occasionally begins to become enlarged and erect.
(ii) Formation of sperms needs lower temperature than the normal body temperature. Hence, testis lie outside the body cavity in the scrotum.
(iii) Urethra is a common duct for the passage of both urine and semen.
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