The process in which a small part of the $vas \ deferens$ is removed or tied up through a small incision is called:

Identify the odd one out among the following copper-releasing $IUDs$.

Oral contraceptives prevent:

Tubectomy is a method of sterilization in which

Assertion : Copper $-T$ is an effective contraceptive device in human females.
Reason : Copper $-T$ prevents passage of sperms from vagina upwards into fallopian tubes.

Oral contraceptive pills are taken daily for a period of $...$ days. After a gap of $...$ days,this process is repeated until the woman desires to prevent conception.