Question 6 Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?
Class XI Biology Chapter - Mineral Nutrition Page 205
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It depends on the mobile and immobile elements
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Mobility of a deficient element decides the appearance of symptoms. If the element is relatively immobile then symptoms appear in young parts and if the deficient element is mobile, then symptoms appear in older parts of the plant.
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