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ICSE Question Bank
2017Q5(a)(i)The Reproductive System
Short answerModerate1 mark
5(a)

The diagram shown below is the longitudinal section of a testis of man. Study it carefully and answer the questions that follow: The diagram shown below is the longitudinal section of a testis of man. Study it carefully and answer the questions that follow:

Figure for this question

Label the parts numbered 1 to 3 in the diagram.

Topic: Parts of the testis

Previous-year question practice database

Answer

Exam answer

1 — SCROTUM (scrotal sac) 2 — SPERM DUCT (vas deferens) 3 — EPIDIDYMIS

Explanation

Identify them by POSITION: the SCROTUM is the outer sac of skin enclosing everything; the EPIDIDYMIS is the long coiled tube lying along the back of the testis; the SPERM DUCT leads away from the epididymis and upward out of the scrotum.

THE PATH OF A SPERM, which fixes the order of all three:

SEMINIFEROUS TUBULES (made here) → EFFERENT DUCTS → EPIDIDYMIS (stored and matured) → VAS DEFERENS → URETHRA

The VAS DEFERENS is what is cut in a VASECTOMY, which is why sperms can no longer reach the semen.

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