A person wants to minimise the chance of pregnancy during the next year. They also want to reduce the transmission of sexually transmitted infections (STIs), but often forget actions that must be repeated.
The table gives information about two contraceptive methods under typical use for one year.
| Method | Hormone released | Effectiveness at preventing pregnancy | Action needed by the user | Reduces STI transmission? |
|---|---|---|---|---|
| Implant | artificial progesterone | 99.9% | no daily action | no |
| Condom | none | 82.0% | must be used correctly every time | yes |
Calculate how many fewer pregnancies would be expected among 1000 implant users than among 1000 condom users during one year.
Explain one way the implant can reduce the chance of pregnancy.
Evaluate the suggestion that this person should use the implant without using a condom.
90 exam-style questions on Edexcel GCSE Biology 7.2 Reproductive hormones, covering 7.2.1 Stages of the menstrual cycle, 7.2.2 Hormonal control of the menstrual cycle, 7.2.3 Hormonal contraception, 7.2.4 Evaluating contraception methods, and 7.2.5 Hormones in Assisted Reproductive Technology. Each one has a worked solution and a mark scheme showing where the marks go.