Diagrams A and B show the ventral (bottom) view of the skulls of two organisms - NSC Life Sciences - Question 3 - 2022 - Paper 2
Question 3
Diagrams A and B show the ventral (bottom) view of the skulls of two organisms. The diagrams are NOT drawn to scale.
3.1.1 Which diagram represents the skull of a b... show full transcript
Worked Solution & Example Answer:Diagrams A and B show the ventral (bottom) view of the skulls of two organisms - NSC Life Sciences - Question 3 - 2022 - Paper 2
Step 1
Which diagram represents the skull of a bipedal organism?
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Answer
Diagram B represents the skull of a bipedal organism. This is evident as the foramen magnum is located in a more forward position compared to Diagram A.
Step 2
Give ONE visible reason for your answer to QUESTION 3.1.1.
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Answer
The foramen magnum in Diagram B is positioned more anteriorly, indicating an upright posture associated with bipedal locomotion.
Step 3
Tabulate TWO visible differences between the jaws in diagrams A and B that represent trends in human evolution.
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Answer
Feature
Diagram A
Diagram B
Canine size
Larger canines
Smaller canines
Jaw shape
Rectangular/U shape
Gentle rounded curve
Step 4
Explain the significance of the shape of the spine that is associated with the skull in diagram B.
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Answer
The shape of the spine in Diagram B is S-shaped. This curvature helps support the upper body weight, enhances shock absorption, and provides flexibility, all of which are crucial for bipedal locomotion.
