Which nutrient is described as essential for growth and as a component of proteins and chlorophyll?

• A. Phosphorus
• B. Magnesium
• C. Nitrogen
• D. Potassium

Answer: (C)

Nitrogen is essential for growth and is a component of proteins and chlorophyll. It is used to make amino acids, the building blocks of proteins that drive tissue development, enzyme production, and overall growth. It also forms part of chlorophyll, the pigment that captures light for photosynthesis, so adequate nitrogen leads to vigorous, green growth. Nitrogen is additionally a part of nucleic acids, supporting cell division and genetic function. While other nutrients have important roles—phosphorus in energy transfer and genetic material, magnesium at the center of the chlorophyll molecule, and potassium in water regulation and enzyme activity—nitrogen uniquely supports both protein synthesis and chlorophyll formation, making it the best choice.