Nitrogen is an essential element in the air. It ensures the survival of living things.
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1. Question3 point(s)
Match the following to complete the sentences.
- atmospheric nitrogen
Correct 3 / 3 PointsIncorrect / 3 Points
This cannot be used directly by plants and animals.
The roots of plant rhizobium bacterium convert nitrogen to
Plants take nitrates to make
2. Question1 point(s)
What percent of the air is nitrogen?CorrectIncorrect
3. Question5 point(s)
Match the following terms to the statements.
- nitrogen-fixing bacteria.
- nitrites and nitrates.
Correct 5 / 5 PointsIncorrect / 5 Points
Animals and plants cannot directly use all the nitrogen found in our .
Only special bacteria can directly use nitrogen in our atmosphere and "fix" it so other organisms can benefit. These bacteria are called
Nitrogen is "fixed" so that it can be absorbed by living things and used to make
At the roots of plants, bacteria covert nitrogen to
Nitrifying bacteria convert ammonia to
4. Question1 point(s)
Nitrogen returns to the soil as ammonia through:CorrectIncorrect
5. Question1 point(s)
Nitrogen fixation can also occur by _________.CorrectIncorrect
6. Question6 point(s)
How do plants and animals get nitrogen if not from the atmosphere?
Complete the answer below by adding the correct terms.
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Plants get nitrogen from the . Bacteria found in the nodules of certain plants and legumes convert in the soil to which can then be converted to and then .