20 Questions
What are the two bacteria species involved in the process of nitrification?
Nitrosomonas and Nitrobacter
Why is the conversion of nitrites into nitrates important?
Ammonia gas is toxic for plants
What is the process called when primary producers take in nitrogen compounds from the soil?
Assimilation
What are the different forms in which nitrogen compounds are available in the soil?
Ammonia, nitrite ions, nitrate ions, and ammonium ions
How does nitrogen enter the food web?
When primary consumers eat the plants
What is the process called when nitrogen is released back into the soil from organic matter?
Ammonification
What is the final stage of the nitrogen cycle?
Denitrification
What is the byproduct of denitrification?
Free nitrogen gas
What is the role of the nitrogen cycle in plants?
Helps plants to synthesize chlorophyll and provides usable nitrogen compounds
How do human activities contribute to the nitrogen cycle?
Combustion of fuels and use of nitrogen fertilizers
What are some characteristics of the tundra biome?
Some characteristics of the tundra biome include an extremely cold climate, low biotic diversity, simple vegetation structure, limitation of drainage, short season of growth and reproduction, energy and nutrients in the form of dead organic material, and large population oscillations.
What are some indicator species of the tundra biome?
Some indicator species of the tundra biome include willows, sedges, and grasses.
What is a keystone species in the tundra biome and why is it important?
The Arctic fox is a keystone species in the tundra biome. It is important because it serves as food for polar bears, wolves, kittiwakes, and snowy owls.
How can you identify a tundra biome?
A tundra biome can be identified by its long, dark, and cold winters with mean temperatures below 0°C for six to 10 months of the year. It also has a layer of permanently frozen ground called permafrost.
What are the steps involved in the nitrogen cycle?
The steps involved in the nitrogen cycle are nitrogen fixation, nitrification, assimilation, ammonification, and denitrification.
What is nitrogen fixation and how does it occur?
Nitrogen fixation is the process of converting inert atmospheric nitrogen into the usable form of ammonia. It occurs through symbiotic bacteria like Azotobacter and Rhizobium, which have nitrogenase enzymes that combine gaseous nitrogen with hydrogen to form ammonia.
What is the role of Azotobacter and Rhizobium in nitrogen fixation?
Azotobacter and Rhizobium are bacteria that play a major role in nitrogen fixation. They have nitrogenase enzymes that can combine gaseous nitrogen with hydrogen to form ammonia.
How can nitrogen fixation occur besides atmospheric fixation?
Nitrogen fixation can also occur through industrial fixation, which involves manufacturing ammonia under high temperature and pressure conditions.
What is nitrification and what does it involve?
Nitrification is the process of converting ammonia into nitrate. It involves the presence of bacteria in the soil.
What is the main form of atmospheric nitrogen and how is it converted into ammonia?
The main form of atmospheric nitrogen is inert. It is converted into ammonia through the process of nitrogen fixation, where symbiotic bacteria deposit the inert nitrogen gas into soils from the atmosphere and surface waters.
Test your knowledge of the unique characteristics of the Tundra ecosystem! Learn about the extreme climate, limited biodiversity, and key indicator and keystone species that make this frozen landscape so fascinating. Challenge yourself with questions on vegetation, population dynamics, and the importance of the Arctic fox. Let's explore the Tundra!
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