Question

Oral contraceptives prevent pregnancy by

• A. Preventing oogenesis
• B. Killing the ovum
• C. Blocking fertilisation
• D. Preventing ovulation

Answer 1

The correct option is D Preventing ovulation

Oral contraceptive pills are usually hormonal preparations such as progestogens or progestogen-oestrogen combinations that are used as tablets for oral administration. These help in prevention of pregnancy by -

• inhibition of ovulation.
• inhibition of motility and secretory activity of fallopian tubes.
• changes in cervical mucus to not allow the passage and transport of sperms.
• making the uterine endometrium environment unsuitable for implantation.