Question

Which of the following statements is incorrect?

• A. Below critical concentration, nutrient levels limit plant growth
  
• B. Beneficial elements include sodium, silicon, cobalt and selenium
• C. Manganese toxicity induces deficiencies of iron and calcium
• D. If there is a deficiency of mobile nutrients, the symptoms are first seen in newer parts of the plant

Answer 1

The correct option is D 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.