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Photo in photosynthesis means 'self' while synthesis means 'produce food'
plants
sunlight
By photo synthesis
Synthesis means to make/produce. In photosynthesis ("photo" refers the "photons" of the light energy that triggers the photo systems in photosynthesis) would be used in referring to the synthesis of glucose (sugar) molecules.
Glucose
Photo and synthesis
Synthesis of glysine and serine,evolution of co2,synthesis of ammonia,protects plant from photo oxidation.
Photosynthetic organisms "prepare" food by synthesis from light thus Photo-synthesis.. synthesis means to make, to produce.
Plant physiology is the science which deals with photosynthesis.
Sunlight, chlorophyll is required for photo synthesis
plants use photosynthesis for preparing food