Assertion (A): The most effective form of contraception is the surgical method.

Reason (R): The surgical procedure stops the passage of gametes, which stops fertilization.

Both A and R are correct, and R is the correct explanation of A

Assertion: Surgical methods prevent conception. The different surgical methods are

●      Tubectomy

●      Vasectomy

●      Orchiectomy

●      Oophorectomy

(a)  Tubectomy: Tubectomy is a sterilisation procedure in women. In this process, the female's fallopian tube is cut and tied. This blocks the transportation of the ovum from the ovaries to the uterus, thereby eliminating any chances of pregnancy.

(b)  Vasectomy: In this process, the male's vas deferens are cut and tied. This blocks the sperms' pathway; therefore, the sperms cannot reach the urethra via the ejaculatory duct.

(c)   Orchiectomy: One or both testicles are surgically removed in this process.

(d)  Oophorectomy: One or both ovaries are surgically removed in this process.

Hence, surgical intervention blocks gamete production and transport, thereby preventing conception.

The reason is the correct explanation of the assertion.