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प्रश्न
Define Organic evolution.
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उत्तर
Organic evolution can be defined as slow, gradual, continuous and irreversible changes through which the present-day complex forms of the life developed (or evolved) from their simple pre-existing forms.
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संबंधित प्रश्न
Give any two distinctive features of Dryopithecus.
State one characteristic which shows that the birds are very closely related to dinosaurs.
Fill in the following blank with suitable word :
The human forelimb and bat's forelimb are an example of .......... organs whereas an insect's wing and a bat's wing are an example of ........... organs.
Match the terms given in column I with those given in column II :
| Column I | Column II |
| (1) Fossil | (a) A famous evolutionist |
| (2) A theory of evolution | (b) Survival of the fittest |
| (3) Probable ancestor of birds | (c) Petrified remains of prehistoric life |
| (4) Charles Darwin | (d) Father of genetics |
| (5) Gregor Mendel | (e) Archaeopteryx |
Explain the following :
(a) Speciation
(b) Natural Selection
List two differences between acquired traits and inherited traits by giving an example of each.
Define the Gene pool.
Short answer question.
Write a note on Genetic drift.
Which one of the following was not given by Darwin's theory of evolution?
Had Darwin been aware of Mendel’s work, would he been able to explain the origin of variations. Discuss.
