A contraceptive causes the mucus at the cervix to become thicker.
How does this reduce the chance of pregnancy?
Fewer follicles pass through the cervix to reach the uterus.
Fewer embryos pass through the cervix to reach an ovary.
Fewer sperm pass through the cervix to reach an egg.
Fewer eggs pass through the cervix to reach sperm.
48 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.