Assertion (A)
: A contraceptive device called the loop or copper T is placed in the uterus to prevent pregnancy.
Reason (R): IUDs prevent pregnancy by thickening the mucus that is present on the
cervix, which blocks and traps the sperm.
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Both assertion and reason are true but reason is not correct explaination of assertion.
Copper t irritates the uterus which causes it to release q mucouse which causes the gaurd cells to come in the uterus. these cells kill the sperms.
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