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  • Atmospheric CO2 contains the naturally occurring stable carbon isotopes 12C and   13C in the proportion of 98.9% and 1.1%, respectively. Following are some of

Atmospheric CO2 contains the naturally occurring stable carbon isotopes 12C and   13C in the proportion of 98.9% and 1.1%, respectively. Following are some of the statements regarding CO2 assimilation:

P. Both C3 and C4 plants assimilate less 13CO2 than 12CO2.

Q. Both C3 and C4 plants assimilate less 12CO2 than 13CO2.

R. C3 plants assimilate lesser 13CO2  than 12CO2 as compared to C4 plants.

S. C4 plants assimilate lesser 13CO2  than 12CO2  as compared to C3 plants.

Which one of the following combinations of above statements is true?

 

Option: 1

 P and Q


Option: 2

P and R

 


Option: 3

R and S


Option: 4

P and S


Answers (1)

best_answer

C3 plants assimilate relatively less 13CO2 compared to 12CO2, resulting in a higher discrimination against the heavier isotope. C4 plants assimilate 13CO2 to a lesser extent than 12CO2, but the discrimination is not as pronounced as in C3 plants.Hence, the correct answer is option 2.

Posted by

Pankaj Sanodiya

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