Which one of the following mineral elements plays an important role in – McqOptions

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1.	Which one of the following mineral elements plays an important role in biological nitrogen fixation? (CBSE 2003; AIEEE 2004; RPMT 2007; DUMET 2009)
A.	Zinc
B.	Copper
C.	Manganese
D.	Molybdenum
Answer» E.

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