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(A) Iron $(Fe)$ is classified as a micronutrient because it is required by plants in small amounts compared to macronutrients. However,among all micro

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Iron

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(A) Iron $(Fe)$ is classified as a micronutrient because it is required by plants in small amounts compared to macronutrients. However,among all micronutrients,it is required in the largest quantity.Iron is an essential component of proteins involved in electron transport,such as ferredoxin and cytochromes. It undergoes reversible oxidation $(Fe^{2+} \leftrightarrow Fe^{3+})$ during electron transfer.Therefore,the correct option is $A$.

List-$I$	List-$II$
$(1)$ For repair of worn-out cells	$(a)$ Phosphorus
$(2)$ In the structure of $ATP$	$(b)$ Magnesium
$(3)$ In the synthesis of $ATP$	$(c)$ Zinc
$(4)$ In the structure of myoglobin in muscles	$(d)$ Iron

Which element is required in large amounts in comparison to other micronutrients and is also a constituent of proteins involved in the transfer of electrons,such as ferredoxin and cytochromes?

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