Short Answer Question on Human Evolution Class 10 Concise ICSE Biology Selina Solutions Ch-14. In this article you will get the solutions of Short Ans Questions on Human Evolution. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.
Short Answer Question on Human Evolution Class 10 Concise ICSE Biology Selina Solutions Ch-14
| Board | ICSE |
| Subject | Biology |
| Class | 10 |
| Book | Selina Concise |
| Chapter-14 | Human Evolution |
| Topics | Solutions of Short Ans Questions |
Solutions of Short Ans Questions on Human Evolution
Que-1: Mention four postulates of Darwin’s theory.
Ans: Four postulates of Darwin’s theory were:
- Overproduction : more offsprings are produced than can survive
- Struggle for existence
- Variation : Individuals within a species show variation
- Survival of the fittest
Que-2: The range of cranial capacities in the following ancestral forms were
(a) Australopithecus
(b) Homo habilis
(c) Homo erectus
(d) Cro-magnon
(e) Homo sapiens sapiens
Ans:
| Ancestral forms | Cranial capacities |
| (a) Australopithecus | 450 to 600 cm3 |
| (b) Homo habilis | 680 to 735 cm3 |
| (c) Homo erectus | 800 to 1125 cm3 |
| (d) Cro-magnon | 1450 to 1600 cm3 |
| (e) Homo sapiens sapiens | 1450 to 1600 cm3 |
Que-3: Mention the two principles through which Lamarck explained his ideas.
Ans:
(a) Use and disuse:
Parts of the body which are used extensively become larger and stronger, while those which are not used deteriorate.
(b) Inheritance of acquired characters:
An organism could pass its modifications to its offspring.
Que-4: Name any three vestigial organs found in humans.
Ans: Three vestigial organs found in humans are wisdom teeth, vermiform appendix and pinna.
Que-5: Give the scientific name of the organism which is cited as the classical example of ‘natural selection’.
Ans: Biston betularia is a classical example of ‘natural selection’.
Que-6: Tick mark (√) the correct option in the following statements.
(a) The fossil history of humans is complete/fragmentary.
(b) The first remarkable human fossil was that of H. habilis/H. africanus.
(c) Evolution is an ever continuing/promptly ending process.
Ans:
(a)The fossil history of humans is fragmentary.
(b)The first remarkable human fossil was that of Homo habilis.
(c)Evolution is an ever continuing process.
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