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The parts of the plants that show the deficiency symptoms also depend on the mobility of the element in the plant. For element that are actively mobilised within the plants and exported to young developing tissues, the deficiency symptoms tend to appear first in the older tissues. For example, nitrogen, potassium and magnesium are visible first in the senescent leaves.

1. Nitrogen
2. Potassium
3. Magnesium
4. All of these

Correct answer: All of these

Solution

Nitrogen, potassium, and magnesium are all mobile nutrients in plants. Because they can be transported from older tissues to younger growing tissues, deficiency symptoms appear first in senescent leaves.

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