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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 which has toxic effect on plant and inhibits calcium translocation in shoot apex. 

Name the mineral essential for carbohydrate translocation and cell differentiation. 

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

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

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