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  4. Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms ?

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Q. Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms ?

Mineral Nutrition

Solution:

The parts of the plants that show deficiency symptoms depend on the mobility of the element in the plant. Deficiency symptoms appear first in young leaves and young tissues for elements which are relatively immobile inside the plant, e.g., Ca and S are a part of the structural component of the cell and hence are not easily released. The symptoms appear first in old leaves and tissues for those elements which are mobilised from senescing regions for supply to young tissues, e.g., $N, K, Mg$.