Final answer:
Plants require mineral ions for growth, with magnesium ions needed for chlorophyll and nitrate ions needed for amino acids. These mineral ions are considered A) macronutrients and are essential elements for plant growth.
Step-by-step explanation:
Plants require mineral ions for growth, and magnesium ions are needed for chlorophyll, and nitrate ions are needed for amino acids.
These mineral ions are considered A) macronutrients, which are essential elements that plants require in larger amounts.
Macronutrients include carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur.