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.
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.
Related Questions
Distinguish between Homo habilis and Homo sapiens sapiens (Posture)
Differentiate between Lamarck's Theory and Darwin's Theory.
Given alongside are two figures (A and B) showing a phenomenon that was first observed in Manchester before and after the year 1850.
Answer the following.
(a) What name has been given to this phenomenon?
(b) Give the common name and the scientific name of the insect involved in this phenomenon.
(c) Briefly mention why the changes shown in the two figures appeared.
(d) The following phenomenon provides a classical explanation of a scientific theory given by a certain scientist.
(i) Name and explain the said theory.
(ii) Give the name of the scientist who gave this theory.
Observe the figure given below and answer the questions that follow:
(a) What is the figure depicting ?
(b) What was the reason that the giraffe stretched their neck and forelimbs ?
(c) What is the name of the theory that is being depicted in the figure ?
(d) Who explained the theory ?
(e) What is the conclusion of this theory ?