Lactic acid produced by fermentation causes the sour taste.
In light-dependent reactions, the energy from sunlight is absorbed by chlorophyll and converted into chemical energy in the form of electron carrier molecules like ATP and NADPH. Light energy is harnessed in Photosystems I and II, both of which are present in the thylakoid membranes of chloroplasts.
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Circadian rhythms ....its just behavior that is repeated over 24 hours
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