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Question

The activator for enzymes Rubisco and PEPCase is a

A
micronutrient
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B
macronutrient
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C
beneficial element
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D
trace element
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Solution

The correct option is B macronutrient
Magnesium is an activator for enzymes Rubisco and PEPCase. These enzymes play a major role in photosynthesis during carbon fixation. Enzymes need cofactors for their activity and metal ions are inorganic cofactors. Metal ions can form coordination bonds with the enzyme and at the same time can form one or more coordination bonds with the substrate as well.
Magnesium is classified as a macronutrient as it is required by plants in higher amounts.

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