Carbon and Nitrogen Cycle

Which biomolecules contain carbon? (select all that apply)

• Carbohydrates

• Protein

• Lipids

• Nucleic Acids

What is a carbon reservoir?

• A carbon reservoir is a type of fossil fuel.
• A carbon reservoir is a method of carbon capture.
• A carbon reservoir is a process of carbon combustion.
• A carbon reservoir is a system that stores carbon in various forms.

Where can carbon be found?

• Carbon can be found in the atmosphere, living organisms, fossil fuels

• Exclusively in outer space
• Only in the Earth's core
• In the ocean as dissolved gas

Carbon can be found in the process of photosynthesis in the form of ​ (a)   from the reactants. In the products of photosynthesis, carbon in found in ​ (b)  

• carbon dioxide (CO2)
• glucose (C6H12O6)
• oxygen (O2)
• water (H2O)
• nitrogen (N2)
• carbon monoxide (CO)
• bicarbonate (HCO3)

What are fossil fuels?

• Fossil fuels are natural energy sources formed from the remains of ancient organisms, including coal, oil, and natural gas.
• Fossil fuels are synthetic materials created in laboratories.
• Fossil fuels are minerals found in the earth's crust.
• Fossil fuels are renewable energy sources like solar and wind.

What happens when there is too much carbon dioxide in the atmosphere?

• Excess carbon dioxide causes more rainfall.
• Too much carbon dioxide leads to increased oxygen levels.
• Too much carbon dioxide causes global warming (too high temperatures) and climate change.

• High carbon dioxide levels result in cooler temperatures.

Nitrogen is found in which 2 biomolecules

• Carbohydrate

• Lipid

• Protein

• Nucleic Acid

What does 'fixed' nitrogen mean?

• Nitrogen that is not available to plants.
• Nitrogen in its gaseous form.
• Nitrogen that has been depleted from the soil.
• Nitrogen that has been converted into a usable form for organisms.

Bacteria that converts the nitrogen in ammonia to nitrates/nitrites are known as -

• Denitrifying bacteria
• Nitrogen-fixing bacteria
• Nitrifying bacteria
• Ammonifying bacteria

Ammonia being returned to the soil is done by a process known as -

• nitrification
• denitrification
• fixation
• ammonification