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Nitrogen Cycle WebQuest
Terms in this set (18)
For what three things do plants and animals need nitrogen?
amino acids, protein, DNA
What are 2 ways nitrogen becomes useable to plants, humans and animals?
during lightning strikes or fires, or by certain types of bacteria
Bacteria alter nitrogen into a form that plants are able to use. Identify this form of nitrogen.
How do herbivores obtain the nitrogen they need?
by eating plants that contain nitrogen
How is nitrogen returned to the atmosphere
denitrifying bacteria changes the dissolved nitrogen back into N2 for their release back into the atmosphere
What are two ways humans impact the nitrogen cycle
nitrogen-rich fertilizers and waste associated with farming bring too much nitrogen to soil and waterways
What happens when there is an excess of nitrogen?
The increased nitrate levels cause plants to grow rapidly until they use up the supply and die. The number of plant-eating animals will increase when the plant supply increases and then the animals are left without any food when the plants die.
nitrogen-fixing bacteria found in soil or in the roots of certain plants convert free nitrogen into a form that organisms can use
what is free nitrogen converted into?
nitrates, nitrites, and ammonia
excess use of fertilizer
what are the six steps of the nitrogen cycle?
Nitrogen fixation, ammonification, nitrification, assimilation,
nitrogen gas is combined with hydrogen to form ammonia
bacteria in soil converts ammonia to ammonium
conversion of ammonium to nitrates
absorption of nitrates by plants first then animals
why do organisms need nitrates?
to make proteins and DNA
nitrogen gets returned to the atmosphere
breaks down dead organisms and releases ammonium into the atmosphere
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