Which of the following mineral is associated with the characters/functions given below ? (i) Hel...

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Which of the following mineral is associated with the characters/functions given below ?
(i) Helpsinformation of middlelamella.
(ii) Needed in mitotic spindle formation.
(iii) Accumulates in older leaves.
(iv) Involves in normal functioning of the cell membranes.
(v) Activate certain enzymes.
(vi) Plays an important role in regulating metabolic activities.
(A) \( \mathrm{K}^{+} \)
(B) \( \mathrm{NO}_{3}^{-} \)
(C) \( \mathrm{Fe}^{3+} \)
(D) \( \mathrm{Ca}^{2+} \)
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