JAMB - Biology (2005 - No. 26)
From the diagram above Birth control by vasectomy is achieved by severing the structure labelled
I
II
III
IV
Explanation
Vasectomy, also known as male sterilization, is a highly effective and permanent form of birth control for men achieved by surgically cutting or blocking the vas deferens, the tubes that carry sperm..
The Vas deferens is labelled III