The toxicity level of Zn (mg/kg) in plants suggested by some workers is___________________?
Correct answer: C. > 400 mg kg-1
- A. > 50 mg kg-1
- B. > 10 mg-1
- C. > 400 mg kg-1
- D. None of these
Explanation
Plant zinc toxicity is commonly associated with tissue concentrations above about 400 mg kg⁻¹, although the precise threshold varies with plant species and growing conditions. The lower figures given are generally within or near adequate ranges rather than a broad toxicity threshold.
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