Answer:
Manganese 
becomes toxic when
absorbed by plants in higher amounts. The toxicity expressed in form of brown
spots surrounded by chlorotic vein.
It is due to the
following reasons
(i) Reduction
in uptake of 
and 
(ii)
Inhibition of binding of to
specific enzymes.
(iii)
Inhibition of 
translocation
in shoot apex.
Thus, excess
of causes deficiency
of iron, magnesium and calcium.
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