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[A]: Radioactive carbon ^(14)C method i...

[A]: Radioactive carbon `^(14)C` method is quite accurate for relatively recent fossils, not older than 40,000 years.
[R]: It was discovered by Libby.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
B
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In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants systhesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. A piece of wood from an archeological source shows a C-14 activity which is 60% of the activity found in fresh wood today. The age of archeological sample will be:

In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants synthesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. C-14 exists in atmosphere due to:

TRUEMAN BIOLOGY-Genetics-ASSERTION AND REASON
  1. [A]: Isolation is a mechanism which prevents interbreeding among other...

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  2. [A]: Mesozoic era is known as the 'Age of Reptiles'. [R]: It was ...

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  3. [A]: Radioactive carbon ^(14)C method is quite accurate for relativel...

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  4. [A]: According to Hardy-Weinburg law both gene frequencies and genotyp...

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  5. [A]: 'Ontogeny recapitulates phylogeny' was the concept put forward by...

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  6. [A]: Vestigeal organs are those parts of the body which are greatly re...

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  7. [A]: Homology is the similarity between organs of same animal based on...

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  8. [A]: Ear muscles of external ear in man are well developed. [R]:...

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  9. [A]: Convergent evolution leads to production of analogous similaritie...

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  10. [A]: Heritable changes are also called muta- tions. [R]: Mutation...

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  11. [A]: In some organisms the end stages of the ancestral development pat...

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  12. [A]: Homologous organs have similar structure but different functions....

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  13. [A]: In large groups of animals and plants, there are identical enzyme...

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  14. [A]: During evolution of Primates, various groups diverged in a partic...

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  15. [A]: Macro evolution produces groups of parallel special adaptations a...

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  16. [A] : Organisms that bear large number of common amino acid sequence m...

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  17. [A]: Homologous organs are similar in basic structure and embryonic or...

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  18. Assertion:Analogous organs serve the same function and look alike, but...

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  19. Assertion:Frog's tadpole has fish-like form, tail and gills Reason: ...

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  20. Assertion:Jurassic period is considered as the age of reptiles. Reas...

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