Which nutrient is needed in relatively large amounts by plants?

• A. Macronutrients
• B. Micronutrients
• C. Carbohydrates
• D. Vitamins

Answer: (A)

Nutrients needed in relatively large amounts by plants are called macronutrients. These include the major mineral elements such as nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur, as well as carbon, hydrogen, and oxygen that come from air and water. These elements are required in larger quantities because they form the building blocks of essential compounds, support growth, and drive important processes like photosynthesis and enzyme function. Micronutrients are needed only in trace amounts, and carbohydrates and vitamins aren’t classified as plant macronutrients in the same way—carbohydrates are energy-rich compounds produced by the plant, while vitamins are organic compounds some plants synthesize and use in metabolism.