Which of the following methods of contraception has the maximum chances of failure?

Find out the correct statement.
$I$. Pills prevent ovulation during use as a contraception technique.
$II$. Copper-$T$ prevents implantation.
$III$. Vasectomy produces semen containing no sperm.

What is the function of the gossypol pill derived from cottonseed?

Spermicidal creams used on the coating of condoms,diaphragms,cervical caps,and vaults are used for:

What is the use of condoms?

In females,the oviducts are surgically cut or tied to prevent fertilization. This procedure is called: