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    Question

    Enzyme that fixes CO₂  in C4 plants at Iow

    concentrations?
    A RUBP Correct Answer Incorrect Answer
    B PEPcase Correct Answer Incorrect Answer
    C Oxidase Correct Answer Incorrect Answer
    D Invertase Correct Answer Incorrect Answer
    E Kinase Correct Answer Incorrect Answer

    Solution

    In C4 plants , CO₂  fixation at low concentrations is carried out by the enzyme PEP carboxylase (PEPcase) . This enzyme has a high affinity for CO₂ , allowing the plant to fix CO2 efficiently even when it is present in low amounts. This is the first step in the C4 photosynthetic pathway.

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