A) CuT: Suppress sperm motility and its fertilizing capacity.
B) CuT: Make uterus unsuitable for the attachment of blastocysts.
C) Lippes loop: Protect the users from contracting AIDS and STDs.
D) LNG-20 Acts as spermicidal means and decrease the contraceptive efficiency.
Correct Answer: A
Solution :
[a] The given figure is that of copper CuT. CuT is a simple copper releasing IUD made of a flexible, "T" shaped piece of plastic wrapped with a thin copper containing wire. It helps the uterus and fallopian tubes to produce fluid that kills sperm. This fluid contains white blood cells, copper ions, enzymes, and prostaglandins. Copper ions prevent pregnancy by inhibiting the movement of sperm, because the copper-ion containing fluids are directly toxic to sperm. Even if an aggressive little spermatozoan fertilizes an egg, the copper ion laden environment prevents implantation of the fertilised egg, and thus pregnancy.
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