NEET Sample Paper NEET Sample Test Paper-14

  • question_answer Photosynthesis in \[{{\text{C}}_{\text{4}}}\] plants is relatively less and limited by atmospheric \[\text{C}{{\text{O}}_{\text{2}}}\]levels because of

    A)  Effective pumping of \[\text{C}{{\text{O}}_{\text{2}}}\]into bundle sheath cells.

    B)  Rubis CO in \[{{\text{C}}_{\text{4}}}\] plants has higher affinity for\[C{{O}_{2}}.\]

    C)  Four carbon acids are the primary initial \[C{{O}_{2}}.\]fixation products.

    D)  The primary fixation of \[C{{O}_{2}}\] is mediated through PEP carboxylase.

    Correct Answer: D

    Solution :

    In\[{{C}_{4}}\]plants, the initial fixation of carbon dioxide occurs in mesophyll cells. The primary acceptor of\[C{{O}_{2}}\]is phosphoenolpyruvate or PEP. It combines with carbon dioxide in the presence of PEP carboxylase or PEP Case to form oxaloacetate. \[{{C}_{4}}\]plants are more efficient in picking up \[C{{O}_{2}}\]even when it is found in low concentration because of the high affinity of PEP Case.

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