Biology · Plant Physiology - Mineral Nutrition
Magnesium (Mg2+) and Iron (Fe) both lead to chlorosis when deficient, yet their diagnostic patterns and biochemical roles differ fundamentally. Which of the following options correctly distinguishes the two?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Mg is an immobile element in phloem while Fe is highly mobile in phloem tissue
- 2Mg deficiency causes uniform yellowing across all leaf ages; Fe deficiency causes marginal scorch on young leaves due to lipid peroxidation
- 3Mg activates kinase enzymes and shows symptoms in young leaves; Fe stabilises the thylakoid membrane and shows symptoms in old leaves
- 4Mg is the central metal of chlorophyll and shows symptoms in old leaves; Fe is required for chlorophyll synthesis and shows symptoms in young leaves — both differences are due to mobility in phloem✓
Correct answer
Mg is the central metal of chlorophyll and shows symptoms in old leaves; Fe is required for chlorophyll synthesis and shows symptoms in young leaves — both differences are due to mobility in phloem
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