difference between ps1 and ps2

{1.} The main difference between the two is the wavelengths of light to which they respond. Photosystem I absorbs light with wavelengths shorter than 700 nm, whereas photosystem II absorbs light with wavelengths shorter than 680 nm. However, they are both equally important in the process of oxygenic photosynthesis. {2}

Photosystem I contains the chlorophyll-A molecule P700, which absorbs wavelengths shorter than 700 nm. It receives energy from photons, in addition to the associated accessory pigments in its antenna system, and from the electron transport chain from Photosystem II. It uses the energy from light to reduce NADP+ (nicotinamide adenine dinucleotide phosphate) to NADPH + H+, or simply to power a proton pump (plastoquinone, or PQ).

Photosystem II, which is the first protein complex in the light-dependent photosynthesis, contains the chlorophyll-A molecule P680 that absorbs light with wavelengths shorter than 680 nm. It receives energy from photons and from associated accessory pigments in its antenna system and uses it to oxidize water molecules, producing protons (H+) and O2 as well as passing an electron to the electron transport chain.

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