DP Biology (last assessment 2024)
Question 18N.3.SL.TZ0.2a
| Date | November 2018 | Marks available | [Maximum mark: 1] | Reference code | 18N.3.SL.TZ0.2a |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Calculate | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
18N.3.SL.TZ0.2a
Measurements of the lung capacity of a student were recorded using a spirometer and displayed with a data logger. Initially the student was at rest, then changed to carrying out strenuous exercise. The results are displayed in the graph.
(a)
Calculate the ventilation rate at rest, giving the units.
[1]
Markscheme
12 breaths per minute/6 litres per minute ✔
breaths per minute.
Accept answers from 5.5 to 6 litres per minute.
Answer must include breaths or litres and a standard unit of time.
Correct:
eg: 12 breaths / minute
eg: 0.1 L sec–1 or 6 L min–1
Incorrect:
eg: but 12 breaths = 0 marks
