Hello,
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Let's understand in simple meaning. Photosynthesis is a process of making food from sunlight, Corbondioxide and water used by plant's which in return give oxygen for Humans.
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In physic sense, photosynthesis is a process used by plant's and other organisms to convert light energy into chemical energy
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Photosynthesis is a process and it's explanation itself explains example.So,if you still doesn't understand can ask.