NEET Biology Photosynthesis in Higher Plants Question Bank Critical Thinking

  • question_answer
    During dark reaction for fixation of carbon, the three carbon atoms of each molecule of 3-phosphoglyceric acid (PGA) are derived from [BHU 1994]

    A) RuBP only

    B) \[C{{O}_{2}}\]only

    C) \[RuBP+C{{O}_{2}}\]

    D) \[RuBP+C{{O}_{2}}+PEP\]

    Correct Answer: C

    Solution :

    In carboxylation Ribulose - 1, 5 - biphosphate (RuBP) (= Ribulose diphosphate) acts as\[C{{O}_{2}}\] acceptor and 6 mols of RuBP react with 6 mols of \[C{{O}_{2}}\]and mols of water giving rise to 12 mols of 3-phosphoglyceric acid.


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