At puberty, the body starts to release more reproductive hormones.
Scientists measured the mean concentration of testosterone in the blood of boys of different ages.
The Table shows the results.
Table
| Age in years | Mean concentration of testosterone in nmol/dm3\text{nmol/dm}^3nmol/dm3 |
|---|---|
| 8 | 0.3 |
| 10 | 0.6 |
| 12 | 2.5 |
| 14 | 9.0 |
| 16 | 15.0 |
| 18 | 17.0 |
Name the organ that releases testosterone.
Testosterone is a reproductive hormone.
Give one function of testosterone in males.
Calculate how many times greater the mean concentration of testosterone is at age 16 than at age 10.
Describe the trend shown in the Table.
Use data from the Table in your answer.
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.