NITROGEN CYCLE REVIEW

Front

Our atmosphere is _____ nitrogen gas.

Back

78%

Front

Animals and plants cannot directly use all the nitrogen found in our __________

Back

Atmosphere

Front

Only special bacteria can directly use nitrogen in our atmosphere and “fix” it so other organisms can benefit. These bacteria are called _______________________bacteria.

Back

Nitrogen-fixing

Front

Higher organisms use nitrogen to make their _____________

Back

protein

Front

Animal waste decay by the action of bacteria which create _____________ and ______________products rich in nitrogen, and useful for plants to use again.

Back

ammonia/nitrate

Front

Bacteria in the soil can break down the ammonia into the gaseous form of nitrogen, which is not available for use by plants or animals.

Back

denitrifying

Front

In another part of the cycle, animals eat plants containing nitrogen, which is again returned to the soil by animal ___________ or decaying ______________ and animals.

Back

waste/plants

Front

Which part of the cycle shows how oxygen is returned into the atmosphere and what's the name of these bacterias?

Back

Denitrifying bacteria

Front

Waste and decay of organic matter

Back

B

Front

What letter is described by nitrogen fixed by bacteria in root nodules?

Back

B