Biology · Plant Nutrition
A plant exhibits interveinal chlorosis exclusively on its youngest leaves while older leaves remain green. Which nutrient deficiency best explains this pattern, and what is its underlying biochemical basis?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Magnesium deficiency — Mg2+ is the central atom of chlorophyll and is mobilised from old to new leaves under stress
- 2Iron deficiency — Fe is required for chlorophyll biosynthesis and is phloem-immobile, so young leaves cannot receive redistributed Fe✓
- 3Nitrogen deficiency — N is a component of chlorophyll and is preferentially retained in mature leaves
- 4Calcium deficiency — Ca is structural and prevents cell wall synthesis in older tissue
Correct answer
Iron deficiency — Fe is required for chlorophyll biosynthesis and is phloem-immobile, so young leaves cannot receive redistributed Fe
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