DP Biology (last assessment 2024)
Question 18N.3.SL.TZ0.b
| Date | November 2018 | Marks available | [Maximum mark: 4] | Reference code | 18N.3.SL.TZ0.b |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 4]
18N.3.SL.TZ0.b
The image shows an external view of the human ear.
Explain how sound from an outside source causes movement of the hair cells in the cochlea.
[4]
Markscheme
a. sound travels in «longitudinal» waves/vibrations ✔
b. vibrations in the air cause vibration of the eardrum ✔
c. the vibrations/sounds are passed on to the bones/ossicles «of the middle ear» ✔
d. the bones amplify the sound/vibrations ✔
e. «bones» transmit sound/vibrations to the oval window ✔
f. vibration of oval window causes fluid movement in the cochlea «in the inner ear» ✔
g. hair cells move with the vibrations/sound ✔
