Nitrogen is an essential element in the air. It ensures the survival of living things.
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Question 1 of 6
1. Question
3 point(s)Match the following to complete the sentences.
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- atmospheric nitrogen
- ammonia
- proteins.
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This cannot be used directly by plants and animals.
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The roots of plant rhizobium bacterium convert nitrogen to
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Plants take nitrates to make
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Question 2 of 6
2. Question
1 point(s)What percent of the air is nitrogen?
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Question 3 of 6
3. Question
5 point(s)Match the following terms to the statements.
Sort elements
- atmosphere.
- nitrogen-fixing bacteria.
- proteins.
- ammonia
- nitrites and nitrates.
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Animals and plants cannot directly use all the nitrogen found in our .
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Only special bacteria can directly use nitrogen in our atmosphere and "fix" it so other organisms can benefit. These bacteria are called
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Nitrogen is "fixed" so that it can be absorbed by living things and used to make
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At the roots of plants, bacteria covert nitrogen to
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Nitrifying bacteria convert ammonia to
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Question 4 of 6
4. Question
1 point(s)Nitrogen returns to the soil as ammonia through:
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Question 5 of 6
5. Question
1 point(s)Nitrogen fixation can also occur by _________.
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Question 6 of 6
6. Question
6 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 .
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