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The age of fossils was previously determ...

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

A

Study of carbohydrate and protein in fossils

B

Study of conditions of fossilization

C

Electron spin resonance and fossil DNA

D

Presence of carbohydrate and protein in rocks

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The correct Answer is:
C
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Age of fossils was previously determined by radioactive elements. More precise recent method which has led to revision to evolutionary periods is

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

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

Which of the following ages cannot be determined by radioactive carbon dating?

All radioactive elements which emit beta- rays have the same half - life periods.

Comprehension given below is followed by some multiple choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each, period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthonoids and actinoids are placed at the bottom of the main body of the periodic table (ii) The last element of the p-block in 6th period is represented by the outermost electronic configuration.

The micro essential mineral element which has been reported recently is

Total number of elements of 6th period which have one or more than one 4d electrons :-

Total number of elements of 5th period which have one or more than one 5d electrons :-

Among Period-2 elements - Lithium, Carbon, Fluorine, Neon-State the one which has high electron affinity.

CENGAGE BIOLOGY ENGLISH-EVOLUTION-Archives
  1. The age of fossils was previously determined by radioactive elements. ...

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  2. One of the important consequences of geographical isolation is

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  3. Adaptive radiation refers to

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  4. Industrial meanism as observed in peppered moth proves that

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  5. What is common to whale seal and shark

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  6. Which one of the following is a matching pair of a body feature and th...

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  7. What is common between Parrot, Platy-pus and Kangaroo?

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  8. The finches of Galapagos islands provide an evidence in favour of

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  9. The concept of chemical evolution is based on

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  10. Which one of the following statement is correct ?

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  11. A polygenic trait is controlled by 3 genes A, B and C . In a cross ...

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  12. Which one of the following is incorrect about the characteristics of p...

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  13. Which one of the following pair of items correclty belongs to the cate...

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  14. Thorn of Bougainvillea and tendril of Cucurbita are examples of :

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  15. Which one of the following scientist's name is correctly matched with ...

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  16. Which one of the following in birds indicates their reptilian ancesty?

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  17. Peripatus is a connected link between

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  18. What was the most significant trend in the evolution of modern man (Ho...

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  19. What was the most significant trend in the evolution of modern man (Ho...

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  20. Which one of the following options gives one correct example each of c...

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  21. The extinct human who lived 1,00,000 to 40,000 years ago, in Europe, A...

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