Q. Which among the given is present in Chlorophyll molecule 

Explanation by: Official MCQ Buddy

Chlorophyll is the green pigment in plants responsible for photosynthesis. At its core, chlorophyll molecules contain a magnesium (Mg) atom, which plays a crucial role in capturing light energy.
(A) K (Potassium) – Essential for plant growth but not a part of the chlorophyll molecule.
(C) Fe (Iron) – Important for chlorophyll synthesis but not present in the chlorophyll structure.
(D) Mn (Manganese) – Helps in photosynthesis but is not a part of chlorophyll.
Thus, Magnesium (Mg) is the correct answer.