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Half Life and Average Life

Age of fossil...

Question

Age of fossils was previously determined by radioactive elements. More precise recent method which has led to revision of evolutionary period is

A

Study of carbohydrate and protein in fossils

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B

Study of conditions of fossilisation

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C

Electron spin resonance and fossil DNA

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D

Presence of carbohydrate and protein in rocks

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Solution

The correct option is C
Electron spin resonance and fossil DNA

Electron Spin Resonance or ESR and fossil DNA provide more precise method for determining the age of fossils. This method measures the amount of unpaired electrons in crystalline structures that were previously exposed to natural radiation. The age of substance can be determined by measuring the dosage of radiation since the time of its formation. ESR dating is used instead of Radiocarbon dating because ESR dating can date newly formed materials or previously heated rock.

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Q. Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms, includes

Q. Age of fossils in the past was generally determined by radiocarbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms includes

Q. What are fossils? How are they formed? Describe in brief two methods of determine the age of fossils. State any one role of fossils in the study of the process of evolution.

Q. How has the study of fossils helped in convincing scientists that organisms have come into existence through evolution? How can the age of fossil be determined?

Q. Statement 1: Age of the fossils are determined by carbon dating method.

Statement 2: Radioactive isotopes of elements like carbon and potassium breakdown at unknown rate.

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