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Answer: 2. Ca

Calcium is needed for the formation of the middle lamella (calcium pectate) of the cell wall and for the spindle during cell division. Its deficiency stops growth of meristems, especially the root tip.

Fe, Mn and Zn are required in small amounts for enzyme activity or chlorophyll, but the classic root-tip and meristem effect is that of Ca.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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