DP Biology (last assessment 2024)

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Question 18M.2.HL.TZ1.2b

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.HL.TZ1.2b
Level HL Paper 2 Time zone TZ1
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 2]
18M.2.HL.TZ1.2b
(b)

Birds, bats and humans are all vertebrates with pentadactyl limbs. Birds and bats use their forelimbs to fly whereas humans can use them to lift and manipulate objects. Outline how the bird, bat and human forelimb can be used to illustrate the concept of homologous structures.

[2]

Markscheme

a. (homologous structures have evolved) from a common ancestor 

b. divergent evolution/adaptive radiation 

c. similarities in forelimb bones (in birds, bats and humans) / description of the similarities in bones 

d. different uses/functions

Do not accept (positive) correlation.

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