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B
Potassium
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C
Sodium
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D
Iron
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Solution
The correct option is C Calcium
The middle lamella is a layer rich in pectins which cement the cell walls of adjacent plant cells and forms plasmodesmata (channels for communication between cells).
This pectin-rich layer is made up of calcium and magnesium pectates.
It helps to strengthen the cell wall of two adjacent cells.
Therefore, the main element present in the middle lamella is calcium.