Which one of the following is not a microelement for plants?

Step-by-step solution

Plants require many organic and inorganic nutrients to complete their life-cycle. It has been established that some elements are required by plants in relatively large amount and are called major elements or macronutrients, e.g., C , H , O , N , S , P , K , Ca and Mg . Microelements or minor elements or trace elements are required by plants in very small amount, less than 1 ppm. E.g., Fe, Cu, B, Zn, Mn, Mo, Cl. Thus Cr is not a microelement.