Q.
An energy diagram for the transfer of electrons in the light
reactions of photosynthesis in plants is:
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152
Photosynthesis in Higher Plants
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Solution:
An energy diagram for the transfer of electrons in the
light reaction of photosynthesis in plants is Z-scheme.
Plastocyanin transfers electrons to P700 reaction centre of
PS I. On getting excited, P700 hand over electrons to a special
electron acceptor molecule, which passed downhill to energy
rich molecule. This is called Z scheme due to its characteristic
zig zag shape. This shape is formed when all the carriers are
placed in a sequence on a redox potential scale.