Table 2 shows the mean metabolic rate of humans of different ages.
| Age in years | Mean metabolic rate in kJ/m2/hour\text{kJ/m}^2/\text{hour}kJ/m2/hour: Males | Mean metabolic rate in kJ/m2/hour\text{kJ/m}^2/\text{hour}kJ/m2/hour: Females |
|---|---|---|
| 10 | 48 | 44 |
| 20 | 41 | 38 |
| 30 | 38 | 35 |
| 40 | 36 | 33 |
| 50 | 34 | 31 |
Calculate the percentage decrease in the mean metabolic rate of females between 10 years and 50 years of age.
Use the equation:
percentage decrease=decrease in metabolic rateoriginal metabolic rate×100 \text{percentage decrease} = \frac{\text{decrease in metabolic rate}}{\text{original metabolic rate}} \times 100 percentage decrease=original metabolic ratedecrease in metabolic rate×100Give your answer to 3 significant figures.
51 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.