Which of the following nutrients is classified as a micronutrient?

Manganese is classified as a micronutrient, making it the correct choice. Micronutrients are essential elements that plants need in smaller quantities compared to macronutrients. While both manganese and copper are considered micronutrients, the focus is on manganese in this context.

Manganese plays crucial roles in various plant physiological processes, including photosynthesis, respiration, and nitrogen assimilation. It acts as a cofactor for several enzymes involved in these processes, helping to enhance plant growth and development.

Copper, while also a micronutrient, does not carry the same broad significance in essential plant processes as manganese does, which is why manganese is the primary reference when discussing micronutrients in general. Silicon is not typically classified as an essential nutrient for plant growth, and magnesium is considered a macronutrient.

Understanding the classification of nutrients and their functions can help guide effective fertilization and soil management practices to maximize plant health and productivity.