Biology
Given alongside are two figures (A and B) representing the two stages of evolution of human beings.
Answer the following:
(a) Mention any two contrasting characters between the two stages.
(b) Write all the stages of human evolution in their correct sequence.
(c) State any two characteristic features of stage B.
Human Evolution
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Answer
Stage A → Australopithecus
Stage B → Homo sapiens sapiens (modern man)
(a) 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, snout disappeared |
(b) Stages of human evolution in their correct sequence:
Australopithecus → Homo habilis → Homo erectus → Neanderthal man → Cro-Magnon man → Homo sapiens sapiens (modern man)
(c) Characteristic features of stage B (Homo sapiens sapiens):
- Bipedal locomotion with four reversed curves in the spine.
- Thoracic region flattened into a broad chest by flattening of sternum.
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