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 100percentage decrease=original metabolic ratedecrease in metabolic rate×100
Give your answer to 3 significant figures.
Practise AQA GCSE Biology Respiration with exam-style questions for Foundation and Higher tier. 16 questions covering Aerobic and anaerobic respiration, Response to exercise, and Metabolism, matched to the AQA GCSE Biology (8461) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.