Name the reaction centers of PS I and PS II.

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Hint:PS I and PS II are photosystems that are functional units for photosynthesis. It is a particular pigment organization pattern, which absorbs and transfers light energy and processes the transfer of electrons. These photosystems are present in the thylakoid membrane of the chloroplast in plants, algae, and in the cytoplasmic membrane of certain bacteria like cyanobacteria.

Complete answer:There are two photosystems- PS I and PS II.
PS I absorb light energy for the synthesis of ${NADPH_2}$. The primary function of PS I is NADPH synthesis. It is located on the outer surface of the thylakoid membrane. Pigments in the PS I absorb light of longer wavelengths which is 700nm. There is no Photolysis. PS I is involved in both cyclic and non-cyclic photophosphorylation. Since this system absorbs a wavelength of 700 nm, the reaction center or photo center of PS I is P700.
PS II is a protein complex that absorbs light energy and transfers electrons from water to quinone. The primary function of PSII is the hydrolysis of water and the synthesis of ATP. It is located on the inner surface of the thylakoid membrane. Pigments in the PS II absorb light of shorter wavelengths. Photolysis takes place. Since the system absorbs a wavelength of 680 nm, the reaction center or photo center of PSII is P680.

Note: Photosynthesis is a chemical process by which green plants convert light energy into chemical energy. It takes place inside the chloroplasts, which are green plastics. The reaction in which light energy is used to synthesize ATP and NADPH is called Light reaction. The part of the reaction where light is not necessary and sugar is reduced is called the dark reaction.