Do Plants Need Darkness?

Answer

Yes, plants need darkness to grow. First, in the photosynthesis process itself, there is a reaction known as 'dark reaction' pathway or lately known as 'carbon reaction' pathway where the free energy of ATP and reducing power of NADPH, are used to fix and reduce CO2 to form carbohydrate. Secondly, for inducing the plant to initiate flowering process. This phenomena is known as photoperiod, ie based on the ratio of the daylength to night length over 24 hours.
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