Multiple Choice
Why was the appearance of oxygen in the atmosphere a crucial event in the history of life?
7. Gases
The Ideal Gas Law
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In what way is N2 gas removed from the atmosphere?
A
By precipitation as acid rain
B
By direct absorption into the ocean
C
Through nitrogen fixation by bacteria
D
Through photosynthesis by plants
Verified step by step guidance1
Understand the role of nitrogen in the atmosphere: Nitrogen gas (N₂) makes up about 78% of Earth's atmosphere and is relatively inert due to the strong triple bond between the nitrogen atoms.
Learn about nitrogen fixation: Nitrogen fixation is a process by which certain bacteria convert atmospheric nitrogen (N₂) into ammonia (NH₃), which can then be used by plants to synthesize proteins and other essential compounds.
Identify the organisms involved: Nitrogen-fixing bacteria, such as those in the genus Rhizobium, often form symbiotic relationships with leguminous plants, providing them with usable nitrogen in exchange for carbohydrates.
Distinguish nitrogen fixation from other processes: Unlike precipitation, direct absorption into the ocean, or photosynthesis, nitrogen fixation specifically involves the conversion of N₂ gas into a biologically usable form.
Recognize the importance of nitrogen fixation: This process is crucial for maintaining the nitrogen cycle, allowing atmospheric nitrogen to be incorporated into the biosphere and supporting plant growth and ecosystem health.
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