Question

$NADPH$ is produced in photosynthesis during ?

• A. Dark reaction
• B. Non-cyclic photophosphorylation
• C. Pseudocyclic photophosphorylation
• D. Cyclic photophosphorylation

Answer 1

The correct option is B Non-cyclic photophosphorylation

Non-cyclic phosphorylation involves both Photosystem I and Photsystem II. These two photosystems work in series, first PS II and then PS I. The two photosystems are connected through an electron transport chain. $NADPH$ is synthesized by this kind of electron flow. Electrons are transferred from the PS II and then passed on to the pigments of PS I. Then, electrons get excited and transferred to another acceptor. These electrons are then moved downhill again to a molecule of $NAD{P}^{+}$. The addition of these electrons results in the formation of $NADPH$. This whole scheme is known as Z scheme.