In which of the following forms is iron absorbed by plants?
Option 1 : Free element
Option 2 : Ferric
Option 3 : Ferrous
Option 4 : Both ferric and ferrous
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In which of the following forms is iron absorbed by plants?
Option 1 : Free element
Option 2 : Ferric
Option 3 : Ferrous
Option 4 : Both ferric and ferrous