A) chloride
B) magnesium
C) phosphate
D) molebdenum
Correct Answer: B
Solution :
\[M{{g}^{++}}\] is the main constituent of chlorophyll molecule. Four pyrrole ring in prophyrin head of chlorophyll attached to \[M{{g}^{++}}\] so deficiency of \[M{{g}^{++}}\] causes chlorosis.
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