1. Inhibit testosterone production
2. Prevent sperm from entering the semen
3. Inhibit spem production
4. Interfere with male potency
Read page 61/62, XII NCERT
E: Vasectomy is a surgical procedure for male sterilization or permanent contraception. During the procedure, the male vas deferens are cut and tied or sealed so as to prevent sperm from entering into the urethra and thereby prevent fertilization.