Copper is a micronutrient for plants.

Copper is a micronutrient for plants.

• A. A macronutrient
• B. A micronutrient
• C. A toxic metal
• D. An enzyme cofactor

Answer: (B)

Copper is a micronutrient for plants because it is essential in very small, trace amounts. It serves as a metal cofactor for several enzymes that drive key processes like photosynthesis, respiration, and protection against oxidative stress. For example, copper is a component of plastocyanin, which transfers electrons in the photosynthetic electron transport chain, and it helps several enzymes that detoxify reactive oxygen species. This differentiates it from macronutrients, which plants need in much larger quantities (such as nitrogen, phosphorus, and potassium). Copper can be toxic if levels become too high, but the statement refers to its normal, essential role as a micronutrient.

Copper is a micronutrient for plants because it is essential in very small, trace amounts. It serves as a metal cofactor for several enzymes that drive key processes like photosynthesis, respiration, and protection against oxidative stress. For example, copper is a component of plastocyanin, which transfers electrons in the photosynthetic electron transport chain, and it helps several enzymes that detoxify reactive oxygen species. This differentiates it from macronutrients, which plants need in much larger quantities (such as nitrogen, phosphorus, and potassium). Copper can be toxic if levels become too high, but the statement refers to its normal, essential role as a micronutrient.