Toxicity of Elements and Soil Pollution · NCERT Biology

Toxicity of mineral elements in plants generally occurs when:

  1. When an element is completely absent
  2. When an element exceeds its optimum level
  3. When only micronutrients are available
  4. When soil pH remains constantly neutral
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Correct answer: When an element exceeds its optimum level

Mineral elements are required only within a specific concentration range. Accumulation beyond the optimum level leads to toxicity and metabolic imbalance in plants.

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