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

Answer 1

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.