DP Biology (first assessment 2025)

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Question 19M.1B.SL.TZ2.b

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1B.SL.TZ2.b
Level SL Paper 1B Time zone TZ2
Command term Suggest Question number b Adapted from N/A
b.
[Maximum mark: 1]
19M.1B.SL.TZ2.b

Suggest one reason that the relative brain mass of Homo is different from Parapithecus and Australopithecus.

[1]

Markscheme

a. human cerebral cortex has extensive folding producing a greater mass ✔

b. better diet/more protein allowed increase in «relative» brain mass in humans ✔

c. others had larger body to protect them from predators «without increase in brain mass» ✔

Examiners report

In parts (b) and (c) few candidates referred to ‘relative’ brain mass thereby providing incorrect responses.

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