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The first step of photosynthesis is

1. excitation of electron of chlorophyll by a photon of light
2. formation of ATP
3. attachment of CO₂ to 5 carbon sugar
4. ionisation of water

Correct answer: excitation of electron of chlorophyll by a photon of light

Solution

Photosynthesis begins with the light-dependent reactions, where chlorophyll absorbs a photon and its electron becomes excited. This initial energy capture triggers the later steps that produce ATP and help split water.

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