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

question 61

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)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.
• C)By analyzing the ratio of 13C/12C in marine phytoplankton,the source of the water in which the organisms resided can be determined.
• D)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.

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