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Terms in this set (25)
What percent do nitrogen, oxygen, carbon and hydrogen make up of the living matter in your body?
What is the chemical formula for nitrogen?
Nitrogen gas composes what percent of earth's atmosphere?
Why is the nitrogen cycle necessary?
The nitrogen in the atmosphere is in a form that is not usable by living things. The nitrogen cycle provides a form of nitrogen that living things can use.
Who plays a part in the nitrogen cycle?
Soil, plants, consumers and decomposers.
What specific plant plays a part in the nitrogen cycle?
What do plants use nitrogen for?
In processes that produce proteins, nucleic acids, and hormones.
Why can't plants use atmosphereic nitrogen?
It is a gas and plants must absorb their nitrogen through the soil as mineral ions.
What are the ions in the soil that contain nitrogen?
Ammonium ions (NH4+) or nitrate ions (NO3-).
How can atmospheric nitrogen be converted to ammonium ions or nitrate ions?
The answer is nitrogen fixation.
What is nitrogen fixation?
The chemical process by which atmospheric nitrogen is converted to nitrogenous compounds that can be taken up by plants. (Done by bacteria)
What does the word "fix" in nitrogen fixation, mean?
To be combined.
Who "fixes" atmospheric nitrogen?
Once the bacteria "fixes" the nitrogen, where does the ammonium compound remain?
In the soil.
What does bacteria "fix", or change the nitrogen into?
Ammonium or nitrates.
What happens after the nitrogen-fixing bateria change the nitrogen into ammonium?
The ammonium then picks up another hydrogen ion from the soil, becoming NH4+.
What do ammonifying bacteria do?
Break down organic material such as decaying leaves and in the process contribute ammonium to the soil.
What do nitrifying bacteria do?
Converts the NH4+ to NO3-.
What is the sequence of changes of atmospheric nitrogen in the nitrogen cycle?
N2 to NH3 to NH4+ to NO3-
Where do nitrogen-fixing bacteria live?
In soil or in the roots of plants.
What types of plants have nitrogen-fixing bacteria living in their roots?
What types of plants are legumes?
Peas, peanuts, soybeans, beans and alfalfa.
The nitrogen-fixing bacteria provide the plant with usable nitrogen, what does the plant give to the bacteria?
Carbohydrates and other nutrients needs for survival.
How do farmers use legumes to keep their soil nitrogen rich?
Crop rotation. Planting a nonlegume followed by a legume to maximize the quality of their soil.
What is a producer?
An organism that makes it's own food. (plants)
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