Which of the Following Accurately Describes ¹³C/¹²C Ratios of Plant

question 103

Multiple Choice

Which of the following accurately describes ¹³C/¹²C ratios of plant materials and their use in climate reconstructions?

• A)¹³C is an unstable isotope,which decays at a constant rate.This is used to date plant material,which can then be used as a proxy for temperature and climate conditions at that time.
• B)By analyzing the ratio of¹³C/¹²C in marine phytoplankton,the source of the water in which the organisms resided can be determined.
• C)¹²C is very rare in nature.When it does appear in plant material,it is indicative of climate anomalies.By measuring the ¹³C/¹²C ratios,scientists can determine whether the plants were alive during normal or anomalous conditions.
• D)Different plants use different types of photosynthesis,each producing a different carbon isotope ratio in plant materials,which scientists use to determine past temperature and rainfall conditions.

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