Name the element which is used in the synthesis of cell wall and the formation of mitotic spindle. 

Calcium.
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Name the element which maintains the anion-cation balance in cells and opening and closing of the stomata. 

Potassium.
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Name the mineral which has toxic effect on plant and inhibits calcium translocation in shoot apex. 


Manganese.
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Name the most active nitrogen fixer which is found in rice fields.

Aulosira fertilissima. 
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Name the mineral essential for carbohydrate translocation and cell differentiation. 

 Boron.
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