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  • The CO2 compensation point for C3 plants is greater than C4 plants because in C3 plants  Option: 1</st

The CO2 compensation point for C3 plants is greater than C4 plants because in C3 plants

 

Option: 1

Dark respiration is higher.


Option: 2

Dark respiration is lower.


Option: 3

Photorespiration is present.


Option: 4

Photorespiration is absent


Answers (1)

best_answer

The CO2 compensation point for C3 plants is higher (greater) than that of C4  plants because C3 plants undergo photorespiration.

Photorespiration is a process that occurs in C3 plants when the enzyme Rubisco, which is involved in carbon fixation, binds to oxygen instead of carbon dioxide. This results in the release of carbon dioxide and the consumption of energy and fixed carbon.

The CO2 compensation point is the atmospheric CO2 concentration at which the rate of carbon fixation matches the rate of carbon loss due to respiration and photorespiration. Since C3 plants have photorespiration, they require higher atmospheric CO2 concentrations to compensate for the loss of carbon through this process and to maintain a positive carbon balance. Therefore, the CO2 compensation point is higher in C3 plants compared to C4 plants, which have a more efficient carbon fixation pathway that minimizes photorespiration.

Hence, the correct answer is option 3.

Posted by

Ritika Jonwal

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