Here's how it works:

* Non-cyclic electron flow is a process in photosynthesis where electrons flow from water to NADP+, ultimately producing ATP and NADPH. This is the primary pathway for photosynthesis.

* Photosystem II (PSII) absorbs light energy and uses it to split water molecules, releasing oxygen and electrons.

* These electrons move through an electron transport chain, similar to the process in cellular respiration.

* As electrons flow through the chain, they release energy, which is used to pump protons (H+) across the thylakoid membrane, creating a proton gradient.

* The proton gradient drives ATP synthesis through ATP synthase, which uses the potential energy stored in the gradient to produce ATP.

* Meanwhile, electrons from PSII reach Photosystem I (PSI), which absorbs light energy and boosts their energy level.

* These high-energy electrons are then used to reduce NADP+ to NADPH.

Therefore, non-cyclic electron flow directly contributes to the production of both ATP and NADPH, which are essential for the Calvin cycle, the process that fixes carbon dioxide into sugars.