The three major plant food elements are

• A. Nitrogen, Phosphorus and Potassium
• B. Nitrogen, Potassium, and Calcium
• C. Nitrogen and Phosphorus only
• D. Phosphorus, Potassium, and Calcium

Answer: (A)

Three major plant food elements are the primary macronutrients that plants need in the largest quantities. Nitrogen supports leafy growth and is a major part of chlorophyll, which gives leaves their green color. Phosphorus is essential for energy transfer within the plant (like ATP) and for strong root development, flowering, and fruiting. Potassium helps regulate water movement in cells, activates many enzymes, and supports overall plant vigor and stress tolerance. Because these nutrients are required in the greatest amounts, they’re classified as the major plant nutrients. Other nutrients, such as calcium, are important too but are needed in smaller amounts or serve different roles, so they aren’t listed among the three major elements. Hence nitrogen, phosphorus, and potassium form the correct set.