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(D) $C_{4}$-plants exhibit Kranz anatomy. In these plants,the primary carbon dioxide acceptor in mesophyll cells is phosphoenol pyruvate $(PEP)$.In th

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$I$ and $II$ only

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(D) $C_{4}$-plants exhibit Kranz anatomy. In these plants,the primary carbon dioxide acceptor in mesophyll cells is phosphoenol pyruvate $(PEP)$.In the light reaction of photosynthesis,$PS-II$ absorbs energy at or just below $680 \;nm$,which is why its reaction center is called $P680$.$PS-I$ absorbs energy at $700 \;nm$,and its reaction center is called $P700$.Therefore,statements $I$ and $II$ are correct,while statement $III$ is incorrect because $P680$ is the reaction center of $PS-II$,not $PS-I$.

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Which of the following statements with regard to photosynthesis is/are correct?$I$. In $C_{4}$-plants,the primary $CO_{2}$ acceptor is $PEP$.$II$. In the photosynthetic process,$PS-II$ absorbs energy at or just below $680 \;nm$.$III$. The pigment that is present in the Pigment System-$I$ is $P680$.