What is geological time scale? How is it divided ?

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Answer

Geological time scale is the arrangement of major divisions of geological time into eras, periods and epochs on the time scale.
This division is based on the study of fossilized organisms obtained from the different strata of the earth.
The characteristic significant events that occurred in the organization of organisms helped the geologists to understand the geological time scale.
The major divisions of geological time are called eras.
The eras are divided into periods and the periods into epochs.
By studying fossils in the earth crust, the evolutionary changes in the organisms have been traced out.

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Plasmodium species	Incubation period	Pattern of fever
————	————–	High fever after 48 hours.
————–	28 days	————–
————–	17 days	————-
————	————-	High fever at irregular intervals between 22 to 48 hours.

Column A	Column B
(1) Frederick Griffith	(a) Test tube assay
(2) Avery, McCarty and MacLeod	(b) Streptococcus pneumoniae
(3) Alfred Hershey and Martha Chase	(c) E. coli
(4) Meselson and Stahl	(d) Bacteriophages

Column I (Biofortified crop)	Column II (Nutrient Enrichment)
(1) Maize	(a) Five times more iron
(2) Rice	(b) Twice the amount of lysine and tryptophan
(3) Wheat Atlas-66	(c) Enriched in vitamin A and minerals
(4) Carrots, spinach	(d) High protein content