Carbon and Nitrogen Cycle Study Questions

What process adds carbon dioxide to the atmosphere?

• Photosynthesis

• Respiration

• Transpiration

• Absorption by plants

What process removes carbon dioxide from the atmosphere?

• Decomposition

• Combustion

• Photosynthesis

• Respiration

Tags

NGSS.MS-LS1-6

What is one way that carbon moves from plants to animals?

• Animals eat plants

• Plants perform photosynthesis

• Plants release oxygen

• Carbon seeps into soil

Tags

NGSS.MS-LS2-3

Which human activity releases large amounts of carbon into the atmosphere?

• Planting trees

• Burning fossil fuels

• Recycling

• Consuming oxygen

What role do decomposers play in the carbon cycle?

• They take in carbon through photosynthesis

• They release carbon by breaking down dead organisms

• They trap carbon in the soil

• They store carbon in their bodies

Tags

NGSS.MS-LS2-3

Which of the following increases carbon levels in the atmosphere? (Select all that apply)

• Volcanic eruptions

• Photosynthesis

• Burning wood

• Cutting down forests

In the carbon cycle, carbon is found in all of the following except:

• Carbon dioxide gas

• Glucose in plants

• Proteins in animals

• Nitrogen gas in the atmosphere

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the main source of nitrogen in the atmosphere?

• Nitrates

• Ammonia

• Nitrogen gas (N₂)

• Nitrites

Why do plants and animals need nitrogen?

• For breathing

• For building DNA and proteins

• For storing fat

• For energy

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

What type of organism “fixes” nitrogen from the air into a usable form?

• Earthworms

• Fungi

• Nitrogen-fixing bacteria

• Insects