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In which of the following forms is iron absorbed by plants?
A
Free element
B
Ferrous
C
Ferric
D
Both ferric and ferrous
Explanation
As per NCERT, iron is absorbed as ferric ions.
Detailed Solution
Iron is absorbed by plants in the form of ferric ions (according to NCERT).
Note: the source key marks 'Ferric' as per NCERT but notes that plants actually absorb iron in both forms, $Fe^{2+}$ and $Fe^{3+}$ (preferably $Fe^{2+}$).