The correct answer is Copper.Explanation:Plants are living organisms, like humans, that require nutrients to survive, grow, reproduce, and develop. MicronutrientsMicronutrients are nutrients known as trace elements or minerals that are required in very small amounts to help in growth or metabolism.Boron (B), iron (Fe), chlorine (Cl), manganese (Mn), copper (Cu), zinc (Zn), molybdenum (Mo), and nickel (Ni) are all-important micronutrients.Copper is a micronutrient that is required for plant growth and development. It acts as a catalyst in photosynthesis and respiration and is essential in the formation of lignin in the cell wall.Additional InformationMacronutrientsMacronutrients are nutrients in plants that provide energy to the plants and are required in larger amounts to maintain their growth and development. Nitrogen (N), potassium (K), calcium (Ca), phosphorus (P), magnesium (Mg), sulfur (S), oxygen (O), carbon (C), and hydrogen are some of the most important elements required for crops (H).