Match the following items with the correct phrases.

_______1. In the nitrogen cycle, bacteria called ____________________ convert atmospheric nitrogen gas into ammonia in the soil.
_______2. ____________________ live in the root nodules of legumes such as alfalfa and clover.
_______3. ____________________ are capable of converting the nitrogen within a dead plant or animal into ammonia in the soil.
_______4. In the nitrogen cycle, soil organisms called ____________________ convert ammonia into nitrites, and nitrites into nitrates.
_______5. In the nitrogen cycle, soil organisms called ____________________ convert the nitrogen in nitrates to nitrogen gas in the atmosphere.


a. cyanobacteria
b. denitrifying bacteria
c. nitrifying bacteria
d. nitrogen-fixing bacteria
e. saprophytes


1. d. nitrogen-fixing bacteria
2. d. nitrogen-fixing bacteria
3. e. saprophytes
4. c. nitrifying bacteria
5. b. denitrifying bacteria

Biology & Microbiology

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