Which one of the following is an important component of chlorophyll?

Step-by-step solution

Chlorophyll is a magnesium-porphyrin complex. The central metal ion coordinated within the porphyrin ring structure of the chlorophyll molecule is magnesium ( Mg²⁺ ). While other elements like iron, manganese, and zinc are essential micronutrients for various plant physiological processes, magnesium is the specific metal ion that forms the core of the chlorophyll molecule, which is essential for photosynthesis. Answer: Mg