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Notes of photo respiration topic

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Notes of photo respiration topic

    • Posted by Sharmeela P 6 years ago

    CBSE > Class 11 > Biology
    • 1 answers

    Yogita Ingle 6 years ago

    • The first step of the Calvin pathway is the first CO2 fixation step.
    • Respiration is the reaction where RuBP combines with CO2 to form 2 molecules of 3PGA, that is catalysed by RuBisCO.

    RuBP + CO2 -> 2 X 3PGA

    • RuBisCO has a much greater affinity for CO2 than for O2.
    • In C3 plants, some O2 do bind to RuBisCO, and hence CO2 fixation is decreased.
    • The RuBP instead of being converted to 2 molecules of PGA binds with O2 to form one molecule and phosphoglycolate in a pathway called photorespiration.
    • In the photorespiratory pathway, there is neither synthesis of sugars, nor of ATP.

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