Which nutrients are classified as micronutrients?

Micronutrients are essential elements that plants require in smaller quantities compared to macronutrients. The correct classification of micronutrients includes Boron, Chlorine, Copper, Iron, Manganese, Molybdenum, Nickel, and Zinc. These elements play vital roles in various physiological functions within the plant, including enzyme function and chlorophyll synthesis.

Boron, for example, is crucial for cell wall formation and reproductive development, while Iron is essential for chlorophyll production. Copper is involved in photosynthesis and respiration, and Manganese plays a role in enzyme activation. Each micronutrient is necessary for the plant's growth and health despite being required in minute amounts.

In contrast, the other options either include macronutrients like Nitrogen, Phosphorus, Potassium, Calcium, and Magnesium, which are needed in larger quantities, or combinations that do not accurately reflect the micronutrient classification. To summarize, the group of nutrients listed in the correct answer encapsulates the essential micronutrients that support plant development at various growth stages.