Answer :
The two pathways of light reactions are the a. Noncyclic electron pathway and the cyclic electron pathway.
Noncyclic photophosphorylation involves both Photosystem I and Photosystem II and generates ATP and NADPH, while the cyclic electron pathway mainly produces ATP using only Photosystem I. These pathways are crucial for the light-dependent reactions of photosynthesis.
Noncyclic photophosphorylation, the most common light-dependent reaction, involves both Photosystem II (PSII) and Photosystem I (PSI) and produces both ATP and NADPH. During this process, the flow of electrons is one-way: from water (H2O) to NADP+.
On the other hand, the cyclic electron pathway only involves PSI and primarily generates ATP without producing NADPH. This pathway is typically utilized when the cell requires more ATP rather than NADPH.
