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Hormonal contraceptive pills prevent pregnancy chiefly by:
AForming a physical barrier inside the vagina
BReducing the sperm-fertilizing capacity in the uterus
CInterfering with the release of the egg from the ovary
DLigating the fallopian tube to block the egg
Answer & Solution
Correct answer: C. Interfering with the release of the egg from the ovary
1. Hormonal methods use pills or tablets containing hormones.
2. These hormones interfere with ovulation, stopping the release of the egg from the ovary.
3. With no egg released, fertilization cannot occur.
4. A physical barrier describes condoms/diaphragm and reducing sperm capacity describes the IUD, so they are wrong.
5. Ligating the fallopian tube is the surgical tubectomy, not a pill action, so it is ruled out.
6. Therefore pills act by blocking ovulation, distinct from barrier, IUD and surgical methods.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 17 Reproduction in Plants and Animals "Hormonal Methods", p.261_
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