Question

Which of the following statement with regard to photosynthesis is/are correct?
A. In $C_4$ plants, the primary $C{O}_2$ acceptor is PEP.
B. In the photosynthetic process, PS II absorbs energy at or just below 680 nm.
C. The pigment that is present in the pigment system I is $P_{683}$.

• A. B and C only
• B. A only
• C. C only
• D. A and B only
• E. A and C only

Answer 1

Answer: (D)

A and B only

In PS I, the reaction center chlorophyll a has an absorption peak at 700 nm, hence is called P${}_7$${}_0$${}_0$, while in PS II it has absorption maxima at 680 nm and is called P${}_7$${}_0$${}_0$. C${}_4$ cycle or Hatch and Slack pathway operates in C${}_4$ plants only. The primary acceptor is Phosphoenol pyruvic acid. The first stable compound formed is Oxaloacetic acid which is 4-carbon compound.