The first stage of photosynthesis where chlorophyll absorbs light energy to split water molecules, release oxygen, and produce ATP and NADPH. These reactions occur in the thylakoid membranes of chloroplasts.
The term simply describes reactions that require light, distinguishing them from the light-independent Calvin cycle. This terminology became standard in the mid-20th century as scientists separated photosynthesis into its light-dependent and light-independent components.
Light reactions are like biological solar panels that not only capture sunlight but also split water molecules - the oxygen you breathe is actually a 'waste product' from plants breaking apart H2O to get electrons! Every oxygen molecule in our atmosphere came from this process.
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