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Evolution
Darwinism: Theory of Natural Selection
1 question from 1 paper, each with its answer.
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Concepts tested
- Sequence of Darwin's arguments
All Questions
2003 AIPMT 1 question
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Which one of the following sequences was proposed by Darwin and Wallace for organic evolution : -The main points of the Darwin–Wallace theory of natural selection follow a logical sequence:
1. Overproduction: organisms produce far more offspring than can survive (geometric increase).
2. Variations: individuals of a population differ from one another, and many variations are heritable.
3. Constancy of population size: in spite of overproduction, population sizes remain roughly constant because resources are limited, which leads to a struggle for existence.
4. Natural selection: individuals with favourable variations survive and reproduce more (survival of the fittest), and over generations new species arise.
So the sequence is overproduction, variations, constancy of population size, natural selection.