The toxicity level of Zn (mg/kg) in plants suggested by some workers i

1.	The toxicity level of Zn (mg/kg) in plants suggested by some workers is___________________?
A.	> 50 mg kg-1
B.	> 10 mg-1
C.	> 400 mg kg-1
D.	None of these
Answer» D. None of these

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