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

Use of which of the following contraceptive device has increased in recent years due to its additional benefit of protecting the user from contracting $STDs$ and $AIDS$?

Give full forms :

$1.$ $\rm {GIFT}$   $2.$ $\rm {IUDs}$   $3.$ $\rm {STD}$   $4.$ $\rm {ART}$   $5.$ $\rm {AFT}$

Correct the following statements:

$(a)$ Surgical methods of contraception prevent gamete formation.

$(b)$ All sexually transmitted diseases are completely curable.

$(c)$ Oral pills are very popular contraceptives among the rural women.

$(d)$ In $\mathrm{E. T.}$ techniques, embryos are always transferred into the uterus.

Explain the Word Difference :  Termination of pregnancy / abortion  and contraception