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Which of the following is deficiency symptom of magnesium?

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Which of the following is deficiency symptom of magnesium?

(a) Chlorosis in young leaves

(b) Chlorosis in older leaves

(c) Spindly and woody stem

(d) Elongated stem

The question was posed to me in an interview.

My doubt is from Mineral Nutrition in chapter Plant Physiology of Life Sciences

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The correct option is (b) Chlorosis in older leaves

The best I can explain: Deficiency of magnesium causes chlorosis in older leaves first while chlorosis in younger leaves is caused by the deficiency of sulfur.

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