Why it is necessary to protect chlorophyll-a from photo-oxidation process ?  

Dear Student, 

You must be knowing that the oxidation is the loss of electron. Photo-oxidation is the oxidation under the influence of light energy. The example of photo-oxidation in photosynthesis is the excitation of chlorophyll molecules.

Photo-oxidation is the destruction of photosynthetic pigment when illuminated. It  leads reduction of photosynthetic rates.

The carotenoids (accessory pigments) have another role as an antioxidant to prevent photo-oxidative damage of chlorophyll molecules.

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   Thank You Mam .

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