DP Biology (last assessment 2024)
Question 18M.3.HL.TZ1.2c
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.HL.TZ1.2c |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Compare and contrast | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
18M.3.HL.TZ1.2c
The graph shows the ventilation rate and tidal volume of a well-trained runner during exercise on a treadmill. The tidal volume is the volume of air being moved in and out of the lungs in each breath.
(c)
Compare and contrast the effect of increasing treadmill speed on the ventilation rate and tidal volume in this runner.
[2]
Markscheme
a. both ventilation rate and tidal volume increase with increase in treadmill speed/ intensity of exercise
b. at low treadmill speed/below 14.2 km h-1, the tidal volume increases more steeply than ventilation rate
OR
at high treadmill speed, ventilation rate increases more steeply than tidal volume
OR
tidal volume plateaus while ventilation rate does not
