How long it remains effective for contraception?

Explain how do IUDs act as effective contaceptives in human females.

What are different methods of contraception?

consider the statements given below regarding contraception answer as directed thereafter. (a) medical termination of pregnancy (MTP) during first trimester is generally save, (b) generally chances of conception are Nil until mother breast-feeds the infant up to 2 years. (c) intrauterine devices like copper-T are effective contraceptives. (d) Contraceptive pills may be taken up to 1 week after coitus to prevent conception. which two of the above statements are correct?

How do IUDs prevent contraception?

How do injections and implants help in contraception?

Give one example of each (i) mechanical methods of contraception (ii) chemical methods of contraception?