Question

Given alongside are two figures (A and B) representing the two stages of evolution of human beings.

Answer the following:

1. Mention any two contrasting characters between the two stages.
2. Write all the stages of human evolution in their correct sequence.
3. State any two characteristic features of stage B.

Answer 1

(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):

1. Bipedal locomotion with four reversed curves in the spine.
2. Forehead steep, reduced brow ridges.