Definition check (plant physiology): Choose the best description of photo-oxidation. Full question: Photo-oxidation is best described as which of the following processes? Choose the correct option.

Given data

• Term: Photo-oxidation.

Concept / Approach
Photo-oxidation refers to oxidation reactions triggered by light, often mediated by reactive oxygen species. In plants, excessive light can cause chlorophyll photo-oxidation (bleaching) unless protected by carotenoids and non-photochemical quenching.

Eliminating distractors
CO₂ reduction by light is photosynthesis, not photo-oxidation. Oxidation in darkness is the opposite of photo-oxidation. Mitochondrial respiration is light-independent.

Final Answer
Oxidation (degradation) of molecules induced by light, e.g., bleaching of chlorophyll at high light.