OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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How effective is the mini-pill at preventing pregnancy?

Approximately 75%
About 90%
Overall, 99%
Only 50%

The correct answer is: Overall, 99%

The mini-pill, also known as the progestin-only pill, is highly effective at preventing pregnancy, with a typical use effectiveness rate approaching 99%. When taken consistently and correctly, this contraceptive method provides a reliable means of preventing ovulation and thus reduces the likelihood of conception significantly. It works primarily by thickening cervical mucus to block sperm entry and thinning the uterine lining to prevent any possible implantation. It's important to note that the effectiveness can vary depending on factors such as adherence to the daily intake schedule and potential interactions with certain medications. Therefore, while its effectiveness rates can be impressive, the actual success can depend on user behavior and additional health factors.