Lippe's loop is a type of contraceptive used as:

What is the purpose of contraceptive pills?
$I$. They inhibit ovulation and implantation
$II$. They alter the quality of cervical mucous to prevent or retard the entry of sperms
$III$. They prevent the ejaculated semen from entering the female vagina
$IV$. They inhibit spermatogenesis

Which of the following pills contains only progesterone?

Which of the following is not a natural method of contraception?

Which of the following statements is correct regarding oral contraceptive pills?

Which of the following functions are true for copper ions released by copper-releasing $IUDs$?
$I -$ Suppress sperm motility
$II -$ Inhibit the fertilizing capacity of sperms
$III -$ Make the uterus unsuitable for implantation
$IV -$ Make the cervix hostile to sperms