Q. In which of the following forms is iron absorbed by plants :
(a) Ferric
(b) Ferrous
(c) Free element
(d) Both ferric and ferrous
Solution :
Correct option : D
Plants only need a tiny amount of iron to be healthy, but that small amount is crucial.
Plant roots absorb Fe from the soil solution most readily as (ferrous) Fe2+ but in some cases also as (ferric) Fe3+ ions. The chemical nature of Fe allows it to play an essential role in oxidation and reduction reactions, respiration, photosynthesis, and enzyme reactions.