Which method of contraception involves the removal of a small part of the vas deferens?
Vasectomy is a permanent male contraceptive method where a small portion of the vas deferens is removed or tied. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.