BHU PMT BHU PMT Solved Paper-2004

  • question_answer
    Which of the following is the First compound that accepts carbon dioxide during dark phase of photosynthesis ?

    A)  NADP                                  

    B)  RuBP

    C)  Ferridoxin                         

    D)  Cytochrome

    Correct Answer: B

    Solution :

                     Dark phase of photosynthesis or Calvin cycle takes place in stroma of chloroplast. First step of dark phase is carboxylation. In carboxylation \[C{{O}_{2}}\]is combined with RuBP to form first stable compound. \[\text{6RuBP+6C}{{\text{O}}_{\text{2}\,}}\xrightarrow[\text{RuBP}\,\text{carboxylase}]{}\] 12 phosphoglyceric acid NADP acts as hydrogen acceptor. Cytochrome or iron porphyrin protein involves in electron transport chain. Ferridoxin is a pigment. It is a component of photosysiem-1 and involves in light reaction of photosynthesis.


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