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    Question

    CO₂ fixation in C4 plants occurs in which type of cells?

    A Mesophyll cells Correct Answer Incorrect Answer
    B Bundle sheath cells Correct Answer Incorrect Answer
    C Epidermal cells Correct Answer Incorrect Answer
    D Guard cells Correct Answer Incorrect Answer
    E Cortex cells Correct Answer Incorrect Answer

    Solution

    In C4 plants, the first step of CO₂ fixation takes place in the mesophyll cells where phosphoenolpyruvate (PEP) carboxylase fixes CO₂ into a 4-carbon compound. This compound is later transported to bundle sheath cells for the Calvin cycle, helping reduce photorespiration.

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