A) \[C{{a}^{++}}\]
B) \[M{{g}^{++}}\]
C) \[{{K}^{+}}\]
D) Sulphur
Correct Answer: C
Solution :
Deficiency of potassium results in marginal and intervenal mottled chlorosis and necrosis. It is required for synthesis of protein, cell membrane osmotic potential, turgidity of cell etc.
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