Which of the following is not a macronutrient?
Manganese
From the given options, manganese is not a macronutrient. It is a micronutrient.
Macronutrients: They are the nutrients that are required in larger amounts by plants such as carbon, hydrogen, nitrogen, oxygen, phosphorous, potassium, calcium, sulphur, and magnesium.
Micronutrients: They are nutrients that are required in relatively small amounts by the plant such as boron, chlorine, manganese, iron, zinc, copper, and molybdenum.