Are Carbon (C), Hydrogen (H), and Oxygen (O) classified as macronutrients or micronutrients?

Carbon, Hydrogen, and Oxygen are classified as macronutrients because they are fundamental building blocks of organic molecules and are required in relatively large quantities for plant growth and development. These elements are essential for photosynthesis and respiration processes, where carbon, obtained from carbon dioxide, is converted into organic compounds, while hydrogen and oxygen are vital components of water and organic molecules.

Macronutrients are generally required in larger amounts compared to micronutrients, which are needed in trace or smaller quantities. Other essential macronutrients include nitrogen, phosphorus, and potassium, which also play critical roles in plant physiology. In contrast, micronutrients like iron and zinc are required for specific biological functions but in much smaller amounts. Therefore, classifying Carbon, Hydrogen, and Oxygen as macronutrients reflects their significant importance and the volume in which plants utilize them.