AP BIOLOGY

Detailed explanation-1: -Excited electrons leave the Photosystem I reaction-center chlorophyll and are taken up by an electron acceptor, which passes them down an electron transport system before they return to Photosystem I.

Detailed explanation-2: -The reaction centre contains pigments such as chlorophyll and phaeophytin. These absorb light, promoting an electron to a higher energy level within the pigment. The free energy created is used to reduce an electron acceptor and is critical for the production of chemical energy during photosynthesis.

Detailed explanation-3: -Chloroplasts Capture Sunlight When light strikes chlorophyll (or an accessory pigment) within the chloroplast, it energizes electrons within that molecule. These electrons jump up to higher energy levels; they have absorbed or captured, and now carry, that energy.

Detailed explanation-4: -When Electrons of a Chlorophyll Molecule are excited to a higher energy level, They are transferred to a Primary Electron Acceptor.

Detailed explanation-5: -Light energy causes the excitation and loss of an electron from a PSII reaction center chlorophyll (P680). Water is oxidized to replace the lost electron, generating H+ ions and oxygen (O-2) ions. These O-2 ions combine to form the diatomic O2.