Which carbon fixation efficiency occurs when excessive UV radiation inhibits C4 photosynthetic pathways?

💡 Explanation

When UV radiation inhibits C4 pathways, reduced PEP carboxylase action lowers CO2 supplied to RuBisCO, decreasing the carboxylation efficiency because the carbon concentrating mechanism fails. Therefore, reduced cycle efficiency results, rather than other options that relate to distinct or improved photosynthetic features.

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