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

Back

Front

Which nitrogen cycle process is occurring when nitrogen in plant or animal protein is converted to ammonium? Options: nitrogen fixation, nitrification, denitrification, ammonification, assimilation

Back

ammonification

Front

Nitrogen molecules present in the atmosphere: NH₃, NH₄⁺, NO₃^-, N₂

Back

N₂

Front

Which nitrogen cycle process converts atmospheric nitrogen to a soil form usable by plants?

Back

nitrogen fixation

Front

What nitrogen cycle process takes place when deciduous trees shed their leaves and specialized soil bacteria consume the leaf material for energy, returning some of the leaf nitrogen to the soil?

Back

ammonification

Front

According to this diagram, plants use nitrogen to make _________________________

Back

proteins

Front

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

Back

nitrogen fixation

Front

How much of the atmosphere is composed of nitrogen gas?

Back

78%