DP Biology (last assessment 2024)
Question 18N.2.SL.TZ0.b
| Date | November 2018 | Marks available | [Maximum mark: 5] | Reference code | 18N.2.SL.TZ0.b |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 5]
18N.2.SL.TZ0.b
The human hand is an example of adaptive radiation. Outline adaptive radiation.
[5]
Markscheme
a. «happens in a group of species that» evolve from a common ancestor ✔
b. evolution «of a structure» in different ways ✔
c. for different functions ✔
d. common features remain «despite the differences» ✔
e. homologous structures are evidence «of adaptive radiation»
Must see “homologous” ✔
f. an example of adaptive radiation ✔
g. example of specific adaptation ✔
h. second description of a specific adaptation ✔
example 1:
f. pentadactyl limb
g. human hand is adapted for grasping/climbing/manipulation
h. front limb of mole is adapted for digging»
example 2:
f. «Darwin’s» finches’/birds’ beaks
g. nectar feeding has a long/thin beak
h. seed feeding has a short/stout beak
