To solve this problem, we need to match the elements in List I with their corresponding roles in List II. Let's analyze each element:$\newline \bullet$A. Iron:$\newline$ - Iron is known to be an activator of catalase, an enzyme that helps in the breakdown of hydrogen peroxide.$\newline$ - This matches with III.$\newline \bullet$B. Zinc:$\newline$ - Zinc plays a crucial role in the synthesis of auxin, a plant hormone that regulates growth.$\newline$