- A Manganese
- B Boron
- C Nitrogen
- D Zinc
Correct answer: C. Nitrogen
Explanation: Nitrogen is the macronutrient needed in the largest quantity by plants. It is a component of amino acids, proteins, nucleic acids, and chlorophyll. It is the most common limiting nutrient in agriculture.
Concept context
Essential mineral elements, their roles and deficiency symptoms. Nitrogen fixation and soil nutrition.