Question

During light reaction of photosynthesis, which of the following phenomenon is observed during cyclic phosphorylation as well as non-cyclic phosphorylation?

• A. Release of O${}_2$
• B. Formation of ATP
• C. Formation of NADPH
• D. Involvement of PS-I and PS-lI pigment systems

Answer 1

The correct option is B Formation of ATP

Photolysis of water, the release of oxygen and formation of NADPH takes place during non-cyclic photophosphorylation, while ATP is synthesized in both the cyclic as well as non-cyclic photophosphorylation.

In cyclic photophosphorylation, while passing between ferredoxin and plastoquinone and or over the cytochrome complex, the electron losses sufficient energy to form ATP from ADP and inorganic phosphate. In non-cyclic photophosphorylation, while passing over cytochrome complex, the electrons losses sufficient energy for the synthesis of ATP.

So, the correct answer is option B.