The combined contraceptive pill contains oestrogen and progesterone. A woman takes one pill every day.
Explain how the hormones in the pill prevent pregnancy.
The Table shows the percentage of women who become pregnant in one year when using the combined pill.
Table
| How the pill is used | Percentage of women who become pregnant in one year |
|---|---|
| perfect use (one pill taken at the same time every day) | 0.3 |
| typical use (the way most people take the pill) | 9 |
Calculate how many more women out of 1000 would become pregnant in one year with typical use than with perfect use.
Suggest why the pill is less effective with typical use than with perfect use.
Condoms are a non-hormonal method of contraception.
Give one advantage of using a condom rather than the combined pill.
84 exam-style questions on OCR GCSE Biology 3.2 Coordination and control – the endocrine system, covering 3.2.1 Principles of hormonal coordination and control, 3.2.2 Roles of thyroxine and adrenaline, 3.2.3 Hormones in human reproduction, 3.2.4 Interactions of reproductive hormones, 3.2.5 Hormones in contraception, 3.2.6 Hormones in reproductive technologies, 3.2.7 Plant hormones in growth and coordination, 3.2.8 Effects of plant hormones, and 3.2.9 Uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.