38.Which one of the following is not an essential element for plants? A. Potassium B. Iron C. Iodine D. Zinc
Option C. Iodine is not an essential element for the plant. No major functions will be harmed in case of deficiency. Hence it is a micronutrient. Whereas iron, zinc and potassium are macronutrients. They are essential for structural, functional and metabolic processes.
