30 Questions
Which of the following is not one of the most important processes involved in the hydrologic cycle?
Photosynthesis
What is the primary way that carbon is stored long-term on Earth?
In rocks and sediments
How does the amount of carbon on Earth today compare to the amount that has always been present?
The amount of carbon has remained the same
What is the primary way that carbon is released back into the atmosphere from long-term storage?
Burning of fossil fuels
Which of the following is not a reservoir or sink through which carbon cycles on Earth?
The Sun
What is the primary role of marine organisms in the carbon cycle?
They produce carbon through living and dying
What is one of the consequences of excess carbon dioxide mentioned in the text?
Disrupting the planet's ecosystems
Where is organic nitrogen mainly found?
In living organisms
What is the role of symbiotic bacteria in the Nitrogen Fixation Process?
Converting inert nitrogen into a usable form
Which of the following processes involves converting nitrogen gas into various forms and back into the atmosphere?
Nitrogen Fixation
How is nitrogen made available to plants according to the text?
By consuming other living organisms
What is the primary source of inorganic forms of nitrogen?
Atmosphere
How is ammonia primarily produced in industrial nitrogen fixation?
By combining nitrogen and hydrogen directly
Which process involves the conversion of ammonia into nitrate in the soil?
Nitrification
What is the role of Rhizobium and blue-green algae in biological nitrogen fixation?
Convert unusable nitrogen into usable compounds
How are nitrites formed during nitrogen fixation?
By oxidation of ammonia with Nitrosomonas bacteria
What happens to the energy from lightning during atmospheric fixation of nitrogen?
It breaks down nitrogen oxides into nitrogen gas
Which bacteria species are involved in converting nitrites into nitrates?
Nitrobacter
What is the process that increases the availability of phosphorus in the soil?
Dissolution
Which enzyme catalyzes the mineralization of phosphorus?
Phosphatase
What is the main reason for the decrease in availability of phosphorus in the soil?
Precipitation
In what type of soils does sorption of phosphorus primarily occur through covalent bonds with Fe and Al?
Acidic soils
What is the term used to describe the microbial cycling of P from inorganic soluble forms to insoluble organic forms?
Immobilization
Which process contributes to the availability of sulfur for plants by releasing it into the atmosphere?
Fossil fuel burning
Which process converts organic matter back into ammonium?
Ammonification
Which nitrogen compound is converted into gaseous nitrogen during denitrification?
Nitrate ions
Which of the following is NOT a form of nitrogen compound that plants can absorb from the soil?
Nitrogen gas
Which bacterial species are involved in the denitrification process?
Clostridium and Pseudomonas
What is the importance of the conversion of ammonia to other nitrogen compounds?
It makes ammonia less toxic for plants
Which stage of the nitrogen cycle is responsible for introducing usable nitrogen compounds into the ecosystem?
Nitrogen fixation
Test your knowledge on the hydrologic cycle and carbon cycle, which are essential processes in the biogeochemical cycles of the Earth. Learn about key concepts including evaporation, transpiration, condensation, precipitation, runoff, and the significance of carbon as the chemical backbone of life on our planet.
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