Question

The given diagram shows the skulls of two different mammals.

Which of the following options accurately describes the differences between these skulls ?

• A. Skull B is the ancestor of skull A.
• B. Skull A has more brain capacity than skull B.
• C. Skull A is of a human and skull B is of an adult chimpanzee.
• D. Skull A is of an adult chimpanzee and skull B is of a human.

Hint:

The skull with the protruding jaw and small braincase is the chimpanzee (A); the rounded one is the human (B).

Answer 1

The Correct Option is D

Step 1: Read the diagram:
Skull A has a long, protruding jaw, a sloping forehead, heavy brow ridges and a small braincase.
Skull B has a rounded, large braincase, a flat face and a small jaw.

Step 2: Identify the skulls:
A protruding snout with a small braincase is a feature of an adult chimpanzee.
A big rounded cranium and a short face are features of a human.
So A is the chimpanzee and B is the human.

Step 3: Check the options:
(A) is wrong. Humans did not descend from chimpanzees, and they only share a common ancestor.
(B) is wrong. The human skull (B) has the larger brain capacity.
(C) reverses the identification.
(D) matches the features, so it is correct.

Final Answer:
Skull A is an adult chimpanzee and skull B is a human, option (D). \[ \boxed{\text{(D)}} \]