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Suggest three contraceptive methods to control the size of human population which is essential for the health and prosperity of a country. State the basic principle involved in each.

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Three methods of contraception are : 

(i) Barrier method or mechanical method/ Condom/ Diaphragm- To prevent and ova. the meeting of sperms 

(ii) Chemical method/ Oral pills- Changes the hormonal balance of the female partners so that the eggs are not released. 

(iii) Surgical method- To block the vas deferens in males/ vasectomy, or the fallopian tube (oviduct) in females/ tubectomy, to prevent the transfer of sperms or egg and hence no fertilization takes place. 

(iv) IUCDs/ Loop or the copper-T placed in the uterus- To prevent pregnancy.

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