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JEEMAIN and NEET
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Biology
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Q)
Nitrogen fixation in root nodules of Alnus is brought about by :
(
1
)
A
z
o
r
h
i
z
o
b
i
u
m
(
2
)
B
r
a
d
y
r
h
i
z
o
b
i
u
m
(
3
)
C
l
o
s
t
r
i
d
i
u
m
(
4
)
F
r
a
n
k
i
a
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