Certified Crop Advisor Practice Exam

Which of the following is considered a micronutrient?

1. Calcium

2. Copper

3. Magnesium

4. Sulfur

The correct answer is: Copper

Micronutrients are essential elements that plants require in small quantities for proper growth and development. Copper is classified as a micronutrient because it plays a critical role in several physiological processes, including photosynthesis, enzyme function, and metabolic pathways. Even though plants only need a tiny amount of copper, its presence is vital for the synthesis of chlorophyll and the overall health of the plant. In contrast, calcium, magnesium, and sulfur are considered macronutrients, as they are required in larger amounts by plants. Calcium is integral for cell wall structure and growth, magnesium is crucial for chlorophyll formation, and sulfur is important for protein synthesis and various metabolic processes. Understanding the classification of these nutrients helps in managing soil fertility and ensuring optimal plant health.