What are micronutrients, and why are they important?

Micronutrients are trace elements that are essential for plant health, which makes this option the correct choice. These nutrients, though required in smaller quantities compared to macronutrients like nitrogen, phosphorus, and potassium, play critical roles in various physiological functions within plants. Micronutrients, such as iron, manganese, zinc, copper, molybdenum, and boron, assist in processes such as photosynthesis, enzyme function, and overall growth regulation. A deficiency in any of these micronutrients can lead to various plant health issues, including stunted growth, chlorosis (yellowing of leaves), and impaired flowering and fruiting.

The other options describe different categories of nutrients or mischaracterize the nature of micronutrients. Macronutrients, for instance, are indeed required in larger quantities and include the primary nutrients necessary for plant growth. Vitamins, while vital for human nutrition and health, do not fall under the classification of plant nutrients but are essential for metabolic processes in humans. Lastly, while certain nutrients might be abundant in specific soils or conditions, the statement about nutrients being "easily available" doesn’t accurately reflect the role and importance of micronutrients in plant health. Some may actually be in short supply despite being crucial for the well-being of the