Natural methods of contraception work on the principle of avoiding chances of ovum and sperm meeting. It includes:
$A.$ Periodic abstinence
$B.$ Withdrawal
$C.$ Coitus interruptus
$D.$ Lactational amenorrhoea

Castration cannot be taken as a contraceptive device,because

$IUDs$ are small objects made up of plastic or copper that are inserted in the uterine cavity. Which of the following statements are correct about $IUDs$?
$(a)$ $IUDs$ decrease phagocytosis of sperm within the uterus.
$(b)$ The released copper ions suppress the sperm motility.
$(c)$ $IUDs$ do not make the cervix hostile to the sperm.
$(d)$ $IUDs$ suppress the fertilization capacity of sperm.
$(e)$ The $IUDs$ require surgical intervention for their insertion in the uterine cavity.
Choose the most appropriate answer from the options given below:

Explain the difference between Pills and Saheli.

The purpose of tubectomy is to prevent:

....... $IUDs$,in addition,make the uterus unsuitable for implantation and the cervix hostile to the sperms.