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

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1.	Which one of the following elements plays an important role in biological nitrogen fixation [BHU 1985; CBSE PMT 1995; AIEEE 2004]
A.	Molybdenum
B.	Manganese
C.	Copper
D.	Zinc
Answer» B. Manganese

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