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  • Following are certain statements regarding respiratory metabolism in plants: P. Respiratory quotient during the partial breakdown of carbohydrate (alcoholic fer

Following are certain statements regarding respiratory metabolism in plants:

P. Respiratory quotient during the partial breakdown of carbohydrate (alcoholic fermentation) will be infinity.

Q. Respiratory quotient indirectly provides Information about (i) the nature of substrate used for respiration and (ii) the relative rate of competing respiratory processes. 

R. Breakdown of organic acids in mature fruit will exhibit a respiratory quotient value of more than one since organic acids are relatively oxygen-rich compared to other common substrates.

S. Anabolic metabolism can influence respiratory quotient by removing reduction equivalents for respiration leading to a decrease in oxygen uptake.

Which one of the following combinations of the above statement is correct?

 

Option: 1

Only P


Option: 2

Only Q and R 


Option: 3

Only S


Option: 4

P, Q, R and S


Answers (1)

Statement P is incorrect because the respiratory quotient (RQ) during the partial breakdown of carbohydrates (alcoholic fermentation) is not infinity but less than 1 due to the production of ethanol, which does not contribute to carbon dioxide production.

Statement Q is correct as the respiratory quotient provides information about the nature of the substrate used for respiration and the relative rate of competing respiratory processes.

Statement R is correct as the breakdown of organic acids in mature fruit leads to a respiratory quotient value greater than 1 due to the release of carbon dioxide and water.

Statement S is not included in the given combination and cannot be determined from the provided information.

Therefore, the correct combination is in option 2 which is Only Q and R. Hence, the correct answer is option 2.

Posted by

Sumit Saini

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