Discuss geological time scale as evidence of evolution.

Solution

Geological time scale. It is estimated that age of our planet earth is about 4.6 x 10⁶ years and first life originated in water (probably seas) about 3.6 x 10⁶ years ago. Geological time scale is the tabulated form showing the sequence and duration of the eras and the periods with their dominant form of life since the beginning of life on the earth.

G. Araduiana developed the first geological time scale. In the geological time scale, the duration of earth's history has been divided as follows :

Era Periods -

Palaeozoic era has 6 Periods. They are : Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.
Mesozoic era has 3 Periods. They are Triassic, Jurassic and Cretaceous.
Coenozoic era has 2 Periods. Tertiary and Quarternary.

Some of the periods are further divided into still smaller time spans called epochs. Tertiary period 5 epochs namely Palaeocene, Eocene, Oligocene, Miocene and Pliocene.
Quarternary has 2 epochs called Pleistocene and Recent.

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.

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Evolution

Discuss geological time scale as evidence of evolution.

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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Evolution

Discuss geological time scale as evidence of evolution.

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?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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.