SSC MTS EXAM

Detailed explanation-1: -As the electron from the electron transport chain arrives at photosystem I, it is re-energized with another photon captured by chlorophyll. The energy from this electron drives the formation of NADPH from NADP+ and a hydrogen ion (H+).

Detailed explanation-2: -The electron is attached to a primary electron acceptor (different from the one associated with Photosystem II). The electron is passed again through a series of redox reactions, eventually joining NADP+ and H+ to form NADPH. Electrons flow continuously from water to NADPH.

Detailed explanation-3: -Linear electron transport in the thylakoid membrane drives photosynthetic NADPH and ATP production, while cyclic electron flow (CEF) around photosystem I only promotes the translocation of protons from stroma to thylakoid lumen.