Energy Flow Through Ecosystems

AP Biology· difficulty 4/5

A simplified nitrogen cycle is shown.

Which transformation is performed primarily by symbiotic and free-living bacteria such as Rhizobium?

A
$Plant uptake (assimilation)$
B
$NH4+ to NO2- (nitrification)$
C
$NO3- to N2 (denitrification)$
D
$N2 to NH4+ (nitrogen fixation)$
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Explanation

Nitrogen fixation, the conversion of atmospheric N2 to NH3/NH4+, is carried out by nitrogen-fixing bacteria such as Rhizobium and cyanobacteria using nitrogenase.

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