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Nature & Animals

Which outcome occurs when a plant experiences prolonged magnesium deficiency inhibiting rubisco’s activity?

A)Increased photorespiration rate
B)Enhanced synthesis of chlorophyll
C)Decreased xylem water transport
D)Stimulated nitrogen fixation

💡 Explanation

When magnesium is deficient, rubisco's carboxylation activity decreases because magnesium is a cofactor for the enzyme, leading to a buildup of RuBP which encourages photorespiration. Reduced CO2 assimilation increases photorespiration, rather than increased chlorophyll, water issues or nitrogen fixation, which depend on independent pathways.

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