Carbon and Nitrogen Cycle

Where can carbon be found? (select all that apply)

• Living things

• The atmosphere

• Dissolved in the ocean

• Rocks & fossil fuels

What takes in carbon dioxide from the atmosphere?

• Photosynthetic organisms (plants, algae)

• Animals

• Fungi

How does an animal get carbon? (2 Answers)

• It takes in carbon dioxide from the atmosphere when it breaths in.

• It eats another animal that ate a plant.

• It eats a plant or other photosynthetic organism

How does carbon dioxide get back into the atmosphere?

• It is released by solid waste excreted by animals.

• It is released by plants through the process of photosynthesis.

• It is released by plants and animals through the process of cellular respiration.

After a long, long time, the carbon from the remains of dead organisms can be stored in:

• Water

• Rocks

• Fossil Fuels

The burning of fossil fuels returns _____ to the atmosphere.

• Carbon Dioxide

• Oxygen

• Ammonia Gas

What Biomolecules contain nitrogen? (2 answers)

• Protein

• Carbohydrates

• Lipids

• Nucleic Acid

Nitrogen is fixed by what type of organism

• Plants

• Bacteria

• Fungus

Where are nitrogen fixing bacteria found? (select all that apply)

• soil

• water

• air

• plant roots

Denitrifying bacteria convert useable forms of nitrogen to _____.

• liquid nitrogen

• nitrogen gas

• frozen nitrogen