CBSE Class 10 Science 2017 · Paper 31/1/1/C · Question 18

Any three of the following: (1) Barrier (mechanical) method: a condom on the penis, or a similar covering worn in the vagina, prevents the sperms from reaching the egg; condoms also help to prevent sexually transmitted infections. (2) Hormonal (chemical) method: oral pills change the hormonal balance of the body so that eggs are not released, and fertilisation cannot occur (the pills may have side effects). (3) Surgical method: blocking the vas deferens in the male (vasectomy) prevents the transfer of sperms, and blocking the fallopian tubes in the female (tubectomy) prevents the egg from reaching the uterus; in both cases fertilisation does not take place. (4) Intra-uterine device: a loop or copper-T placed in the uterus prevents pregnancy (it may cause side effects by irritating the uterus).