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Question
Given alongside are two figures (A and B) representing the two stages of evolution of human beings.
Answer the following:
- Mention any two contrasting characters between the two stages.
- Write all the stages of human evolution in their correct sequence.
- State any two characteristic features of stage B.
Solution
(a) Stage A: Australopithecus
Stage B: Homo sapiens sapiens
Contrasting characters between Australopithecus and Homo sapiens sapiens:
| Characters | Australopithecus | Homo sapiens sapiens |
| Cranial capacity | 450 to 600 cm3 | 1450 to 1600 cm3 |
| Development of chin | Lack of chin, prognathous face. | Prominent chin and snout disappeared. |
(b) Stages of human evolution in their correct sequence:
Australopithecus > Homo habilis > Homo erectus > Neanderthal man > Cro-Magnon man > Modern man/Homo sapiens sapiens.
(c) Characteristic features of stage B (Homo sapiens sapiens):
- Bipedal locomotion with four reversed curves in the spine.
- Forehead steep, reduced brow ridges.
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| Human Stage | Cranial Capacity | ||
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