It is better to use the mass of the whole plant as the photosynthetic measure because grains only represent a fraction of the weight.
Photosynthesis is a series of chemical reactions that plants use to produce carbohydrates (biomass) by using light energy.
Photosynthesis is responsible to generate all plant biomass, including the comestible fraction of the plant.
In conclusion, it is better to use the mass of the whole plant as the photosynthetic measure because grains only represent a fraction of the weight.
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