Question

Which of the following statements is true with regard to the light reaction of the photosynthetic mechanism in plants?

• A. Magnesium and sodium ions are associated with photolysis of water molecules.
• B. Chlorophyll a occurs with peak absorption at 680 nm in photosystem I and at 700 nm in photosystem II.
• C. Photosystems I and II are both involved in non-cyclic photophosphorylation
• D. Both ATP and NADPH₂ are formed during cyclic photophosphorylation.
• E. 0₂ is evolved during cyclic photophosphorylation.

Answer 1

The correct option is C

Photosystems I and II are both involved in non-cyclic photophosphorylation

In non-cyclic photophosphorylation, the electrons are passed from PS II to PS I, and PS II gains its lost electron from the splitting of water. Because the same electron does not return to PS II, it is called non-cyclic photophosphorylation.