Which of the following mineral elements is needed during the formation of the mitotic spindle, which accumulates in older leaves, and is involved in the normal functioning of the cell membrane?

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Calcium is necessary for the formation of spindle fiber during mitosis. It is an immobile element and is accumulated in older leaves and is involved in the normal functioning of the cell membrane. It is necessary for the formation of the middle lamella of plants where it occurs as calcium pectate. It is necessary for the growth of apical meristem and root hair formation. It acts as an activator of several enzymes, e.g., ATPase, succinic dehydrogenase, adenylate kinase, etc. Along with Na+ and K+ it maintains the permeability of plasma membrane.

Botany - Mineral Nutrition Question with Solution | TestHub

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