Which of the following are considered micronutrients for plants?

The correct choice identifies boron, copper, iron, and zinc as micronutrients for plants. Micronutrients are essential elements that plants require in smaller amounts compared to macronutrients, but they are equally critical for plant health and development.

Boron, for example, plays a vital role in cell wall formation and reproductive processes, while copper is important for photosynthesis and enzyme functions. Iron is crucial for chlorophyll synthesis and overall plant vigor, and zinc supports various metabolic processes. The combination of these elements highlights their specific roles in plant physiology, emphasizing that even in minuscule quantities, they are necessary for optimal growth, health, and productivity.

The other options consist primarily of macronutrients or elements not classified as micronutrients in the context of plant nutrition. Understanding the roles of these micronutrients helps in developing balanced fertilization practices that ensure plants receive the necessary quantities of both macro- and micronutrients for healthy growth.