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IB Biology HL 3.1.2 Species as Groups with Shared Traits

Practise IB Biology HL 3.1.2 by comparing recognition features and anatomical data when distinguishing taxa and hominins.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Distinguish molluscs, platyhelminths and arthropods using segmentation, shells and jointed appendages.
  • Compare recognition features and quantitative skull data to distinguish taxa and related hominins.
  • Use anatomical evidence to justify a species or group classification rather than relying on a single trait.

A3.1.2—Species as groups with shared traits question 1

[Maximum number: 4]

The diagram shows the range of heights and brain sizes found in four groups of hominids.

Figure for Question A3.1.2—Species as groups with shared traits question 1 — IB Biology HL

Question (a)

(a)

Distinguish between the characteristics of the Australopithecus and H. erectus using the data.

[ 2 ]

Question (b)

(b)

State two ways, apart from brain volume, by which the skulls of the Australopithecus and H. erectus would differ in appearance.
1.
2.

[ 2 ]
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