NEET AIPMT SOLVED PAPER MAINS 2010

  • question_answer
    Read the following four statements. A, B, C and D and select die right option having both correct statements.
    A. Z secheme of light reaction takes place in presence of PS-I only.
    B. Only PS-I is functional in cyclic photophosphorylation.
    C. Cyclic photophosphorylation results into synthesis of ATP and \[NADP{{H}_{2}}.\]
    D. Stroma lamellae lack PS-II as well as NADP.

    A)  B and D               

    B)  A and B               

    C)  B and C               

    D)  C and D

    Correct Answer: A

    Solution :

    Cyclic photophosphorylation is performed by PS-I only. In this process, an electron expelled by the excited photocentre, ie, \[{{\text{P}}_{\text{700}}}\]is returned to it after passing through a series of electron carriers. PS-I is located on both the non-appressed part of grana thylakoids as well as stroma thylakoids, while PS-II is located in _the appressed part of grana thylakoids only, stroma thylakoids lack PS-II.


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