Which consequence results when light intensity is insufficient for C4 photosynthetic pathways?

💡 Explanation

When light intensity is insufficient, C4 plants cannot effectively use the C4 pathway to concentrate CO2 due to reduced ATP and NADPH production, causing rubisco to fixate more O2 via photorespiration because the CO2 concentrating mechanism can't be maintained. Therefore photorespiration increases and carbon fixation decreases, rather than the carbon fixation increasing, or chlorophyll inhibiting, or stomata closing, all of which stem from different underlying biochemical mechanisms.

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