The intial product of photosynthesis is glucose some of which is used straight away for the process of respiration. This provides energy to build up larger molecules from smaller ones.
A faster rate of photosynthesis means a faster rate of growth for the plant.
Glucose that is not used straight away is converted to starch for storage.
Why is starch a better storage molecule than glucose?
It's more compact and is a large insoluble molecule so that it can stay in one place.
Energy is also used to convert sugars into fatty acids and glycerol, which are then built up into oils for storage in seeds.
Energy is used to convert glucose into cellulose to strengthen cell walls.
Energy is used to convert sugar, nitrates and other nutrients into amino acids which are then built up into protein.
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