A sample of cervical mucus was collected from a person before artificial progesterone treatment. After the treatment, a second sample of cervical mucus was collected. Equal amounts of the two samples were placed in separate tubes.
Equal numbers of sperm cells were added to each tube for the same length of time under otherwise identical conditions.
| Sample | Cervical mucus collected | Number of sperm cells that moved through the cervical mucus |
|---|---|---|
| A | Before treatment | 240 |
| B | After treatment | 60 |
Calculate the percentage decrease in the number of sperm cells that moved through sample B compared with sample A.
Explain how the artificial progesterone treatment could reduce the chance of fertilisation even if an egg is released.
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.