A. Sodium
A.
B. Iron
B.
C. Magnesium
C.
D. Cobalt
D.
Correct Answer: C
সঠিক উত্তর: C
Explanation
ব্যাখ্যা
Chlorophyll or green leaves contain magnesium ions present in the chloroplast of all green plants. Magnesium ion is found in the middle of the porphyrin ring.