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Photon
A particle of electromagnetic radiation; one quantum of radiant energy.
Light Energy
The form of energy visible to the human eye that is emitted by the sun and other sources, crucial for photosynthesis in plants.
Electromagnetic Spectrum
The entire span of electromagnetic radiation, extending from gamma rays to radio waves.
Cyclic Electron Transport
In photosynthesis, the cyclic flow of electrons through photosystem I; ATP is formed by chemiosmosis, but no photolysis of water occurs, and O2 and NADPH are not produced. Compare with noncyclic electron transport.