Describe the effect on chlorophyll-containing photosystems when the chlorophyll molecules absorb photons of light.

Photosystems

Explanation:

Non cyclic electron flow starts with absorption of light (a photon) by photosystem II (PSII)

Upon absorption of photon by reaction center, P680 is excited to P680*The excited P680* transfer one electron to pheophytin and converted in P680+P680+ act as strong oxidizing agent and reduced by tyrosine, which receive electron from oxidation of water

Cyclic electron flow

It starts when ration of NADPH/NADP+ is high (means all NADP+ converted in NADPH)Cyclic electron flow occurs when optimum sunlight and water is present In cyclic electron flow quinone, cytochrome b6f complex, plastocyanin and photosystem I are involved