Front

What % of the air is made of nitrogen?

Back

78%

Front

Is the nitrogen in the atmosphere in the right form for living things to use?

Back

False

Front

What can transform nitrogen in the atmosphere into a usable form of nitrogen?

Back

lightning

Front

What is the role of denitrifying bacteria?

Back

change nitrate back into nitrogen gas

Front

Round structures on the roots of certain plants

Back

nodules

Front

What is the role of decomposing bacteria in the nitrogen cycle?

Back

Return the nitrogen compounds to the soil

Front

Which nitrogen cycle process is occurring when plant roots absorb ammonium ions and nitrate ions for use in making molecules such as DNA, amino acids, and proteins?

Back

assimilation

Front

Which nitrogen cycle process is occurring when bacteria convert ammonium to nitrite and then into nitrate?

Back

nitrification

Front

Which nitrogen cycle process is occurring when nitrogen in plant or animal protein is converted to ammonium?

Back

ammonification

Front

Which of these correctly shows the reservoirs where most of Earth's carbon atoms and nitrogen atoms are residing at any given time?

Back