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Evolution

Question
CBSEENBI12000483
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Give a brief summary od Darwin's theory of evolution and evidences in favor of it and its drawbacks.

Solution

Charles Darwin (1809-1882), a naturalist proposed a theory to explain the process of evolution. His theory was published in his famous book 'Origin of Species' published in 1858. His theory of natural selection is termed Darwinism.
Darwin's Theory of Evolution may be summed up as follows :

1. Rapid multiplication

2. Struggle for existence

3. Variations

4. Natural selection or survival of the fittest

5. Inheritance of useful variations

6. Origin of new species.

Evidences in favour of Darwin's theory.

Darwin's theory is supported by natural selection, phenomena of mimicry and protective colouration, and correlation between nectaries of flowers and proboscis of pollinating insects.

Draw backs - Darwin's theory fails to explain perpetuation of vestigial organs and over-specialization of organs.

 

Some More Questions From Evolution Chapter

Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life :

Sugar, methane, nucleic acid and amino acid.

What is the phenomenon called when the original drifted population becomes founders?

What are the two key concepts of Darwinian Theory of Evolution

What were the units of life according to the early Greek thinkers ?

Mention the type of nutrition in the cells originated first during the origin of life.

Which group of organisms were responsible for appearance of free oxygen in the atmosphere of the primitive earth ?

What is meant by the term fossil ?

What is the type of evolution in which the same structure developed along different directions due to adaptations to different needs ?

Name the different eras of geologic time scale.

What is single step large mutation?

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