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.
General Knowledge
Biology
Difficulty: Easy
Choose an option
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AOxidation (degradation) of molecules induced by light, e.g., bleaching of chlorophyll at high light
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BReduction of carbon dioxide by light
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COxidation occurring only in darkness
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DGeneral photosynthetic CO₂ fixation in the Calvin cycle
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ERespiratory oxidation in mitochondria only
Answer
Correct Answer: Oxidation (degradation) of molecules induced by light, e.g., bleaching of chlorophyll at high light
Explanation
Given data
- Term: Photo-oxidation.
Concept / ApproachPhoto-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 distractorsCO₂ reduction by light is photosynthesis, not photo-oxidation. Oxidation in darkness is the opposite of photo-oxidation. Mitochondrial respiration is light-independent.
Final AnswerOxidation (degradation) of molecules induced by light, e.g., bleaching of chlorophyll at high light.