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Question
The process which makes major difference between C3 and C4 plants is
The process which makes major difference between C3 and C4 plants is
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Solution
The correct option is D photorespiration
In C3 plants, some oxygen binds with RuBisCO, which consumes some RuBP and reduces CO2 fixation.
When RuBP binds O2 in presence of RuBisCO, instead of forming two molecules of 3-PGA, it forms one molecule each of 3-PGA and a phosphoglycolate (2-carbon compound) in a pathway called photorespiration.
There is neither synthesis of sugars nor ATP in photorespiration and is considered to be a wasteful process.
However, in C4 plants, photorespiration does not occur as they have a mechanism that increases the concentration of CO2 at the enzyme site, thereby preventing the binding of O2 to RuBP.
Hence, the process which makes difference between C3 and C4 plants is photorespiration.
The correct answer is option D.
Glycolysis and Calvin cycle are common to both C3 and C4 plants.
In C3 plants, some oxygen binds with RuBisCO, which consumes some RuBP and reduces CO2 fixation.
When RuBP binds O2 in presence of RuBisCO, instead of forming two molecules of 3-PGA, it forms one molecule each of 3-PGA and a phosphoglycolate (2-carbon compound) in a pathway called photorespiration.
There is neither synthesis of sugars nor ATP in photorespiration and is considered to be a wasteful process.
However, in C4 plants, photorespiration does not occur as they have a mechanism that increases the concentration of CO2 at the enzyme site, thereby preventing the binding of O2 to RuBP.
Hence, the process which makes difference between C3 and C4 plants is photorespiration.
The correct answer is option D.
Glycolysis and Calvin cycle are common to both C3 and C4 plants.
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