Answered: 1. What % of air consists of nitrogen…

1. What % of air consists of nitrogen gas? 2. Bacteria in root nodules change nitrogen gas into what form? 3. How do plants obtain the nitrogen they need?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter46: Ecosystems

Section: Chapter Questions

Problem 3VCQ: Figure 46.17 Which of the following statements about the nitrogen cycle is false? Ammonification...

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Concept explainers

Soil Ecosystem

Soil provides a habitat or living environment for a large number of different species of organisms as well as plants. It provides all the essential nutrients and minerals for plants to grow. All these together form the soil ecosystem.

Question

Nitrogen Cycle
Plants and animals die.
Decomposers break
down their nltrogen-
containing molecules to
ammonia.
Nitrogen
Plants use nitrates.
Bacteria in nodules on
some plant roots change
nitrogen gas to ammonia.
Bacteria change
ammonia to nitrates
Bacteria change
nitrates to
nitrogen gas.

14
U
三
+
BSIBS
1
6 | .. 7
1. What % of air consists of nitrogen gas?
2. Bacteria in root nodules change nitrogen gas into what form?
3. How do plants obtain the nitrogen they need?
4. How do herbivores obtain the nitrogen they need?
5. How do other animals obtain the nitrogen they need?
6. What is the role of decomposers in the nitrogen cycle?
7. According to the picture above, how is nitrogen returned to the atmosphere?
8. What would be the impact on the nitrogen cycle if there was a decrease in decomposition in an
ecosystem?

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Figure 22.19 Which of the following statements about the nitrogen cycle is false? Nitrogen fixing bacteria exist on the root nodules of legumes and in the soil. Denitrifying bacteria convert nitrates (NO3 ) into nitrogen gas (N2). Ammonification is the process by which ammonium ion (NH4+) is released from decomposing organic compounds. Nitrification is the process by which nitrites (NO2-) are converted to ammonium ion (NH4+).
Figure 46.17 Which of the following statements about the nitrogen cycle is false? Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4+). Denitrification by bacteria converts nitrates (NO3-) to nitrogen gas (N2). Nitrification by bacteria converts nitrates (NO3) to nitrites (NO2-). Nitrogen fixing bacteria convert nitrogen gas (N2) into organic compounds.
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