It is possible to date the rocks by comparing the amount of specific radioactive isotopes they contain. Which of the statement is correct in this respect?
Correct answer: B. Older sediment layers have less amount of these radioactive isotopes as that of the young ones.
- A. Older sediment layers have equal amount of these radioactive isotopes as that of the young ones
- B. Older sediment layers have less amount of these radioactive isotopes as that of the young ones.
- C. Older sediment layers have greater amount of these radioactive isotopes as that of the young ones.
- D. Older sediment layers did not have these radioactive isotopes
Explanation
Radioactive parent isotopes decay with time, so an older rock generally contains less of the original radioactive isotope than a younger rock formed from the same material. Students may choose option c by thinking that age allows radioactive material to accumulate, but decay reduces the parent isotope instead.
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About Concept of Evolution
Evolution is the heritable change in populations over generations, driven by mutation, recombination, natural selection, genetic drift and reproductive isolation. Questions examine variation, adaptation, survival and reproduction, speciation, fossil and anatomical evidence, and the difference between individual acclimatization and evolutionary change in a population.
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