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Question

Which of the following statements is incorrect?
 
  1. Beneficial elements include sodium, silicon, cobalt and selenium
  2. Manganese toxicity induces deficiencies of iron and calcium
  3. If there is a deficiency of mobile nutrients, the symptoms are first seen in newer parts of the plant
  4. Below critical concentration, nutrient levels limit plant growth
     


Solution

The correct option is C If there is a deficiency of mobile nutrients, the symptoms are first seen in newer parts of the plant
Mobile nutrients - nitrogen, potassium and magnesium. The deficiency symptoms of mobile nutrients are first visible in the senescent (older) leaves.

Immobile nutrients - The deficiency symptoms of immobile nutrients  appear first in the young leaves as they are not transported out of the older leaves. For example, calcium.

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