DP Biology (last assessment 2024)
Question 18M.2.HL.TZ1.3a.i
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.HL.TZ1.3a.i |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Identify | Question number | a.i | Adapted from | N/A |
a.i.
[Maximum mark: 2]
18M.2.HL.TZ1.3a.i
The land snail Cepaea nemoralis is very common in North America and in Europe.
The base colour of its shell varies between brown, pink and yellow, and also in its intensity. Some shells are unbanded, but most show one to five bands of different width on top of the shell base colour.
(a.i)
C. nemoralis is a mollusc. Identify two external features that distinguish this snail from an arthropod.
[2]
Markscheme
a. unsegmented body (whereas arthropods are segmented)
b. shell (versus exoskeleton in arthropods)
c. muscular foot (which arthropods do not have)
d. no jointed appendages/jointed legs (whereas arthropods have jointed legs/appendages)
e. slimy/mucus-covered / arthropod is not slimy
Do not award marks for any answers after the first two given.
