In which of the following forms is iron absorbed by plants?

Plants obtain iron in the form of ferric ions (${\mathrm{Fe}}^{3+}$). It is required in larger amounts in comparison to other micronutrients. It is an important constituent of proteins involved in the transfer of electrons like ferredoxin and cytochromes. It is reversibly oxidised from ${\mathrm{Fe}}^{2+}$ to ${\mathrm{Fe}}^{3+}$ during electron transfer. It activates catalase enzyme, and is essential for the formation of chlorophyll.