Toxicity of Elements and Soil Pollution · NCERT Biology

Which element commonly shows toxicity symptoms when present in excess as a micronutrient?

  1. Nitrogen excess
  2. Phosphorus excess
  3. Boron excess
  4. Iron excess
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Correct answer: Iron excess

Iron is a micronutrient required only in small amounts. Excess iron interferes with metabolic processes and commonly causes toxicity symptoms in plants.

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