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Question

Which of the following statements is true with regard to the light reaction of photosynthesis?

A
In PS – II reaction centre, chlorophyll – a has an absorption peak of 700 nm, hence called p700
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B
In PS – I, the reaction centre chlorophyll –a has an absorption maxima at 680 nm and is called p680
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C
The splitting of water molecule is associated with PS – I
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D
Photo systems – I and II are involved in Z – scheme.
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Solution

The correct option is D Photo systems – I and II are involved in Z – scheme.

Photophosphorylation is the synthesis of ATP from ADP and inorganic phosphate in the presence of sunlight. When the two photo systems, work in a series, first PS – II and then the PS – I, a process called non-cyclic phosphorylation occurs in the two photosystems that are connected through an electron transport chain in Z - scheme. (due to the shape of path of electrons flow). Both ATP and NADH + H+ are synthesized by this kind of electron flow.


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