Carbon and Nitrogen cycles

What process involves plants taking up CO₂ and changing it into organic molecules like sugar?

• Photosynthesis

• Cellular respiration

• Fermentation

• Transpiration

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How do animals obtain sugar according to the carbon cycle?

• By consuming plants

• By absorbing sunlight

• By drinking water

• By breathing air

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What happens to sugar in the bloodstream according to the carbon cycle?

• It is stored as fat

• It becomes available for cellular respiration

• It is excreted as waste

• It evaporates

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When are carbon atoms in the wood of a thousand-year-old tree released?

• When the tree is cut down.

• When fungi and bacteria digest the wood.

• When the tree is burned.

• When the tree is submerged in water.

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What are fossil fuels like coal and oil made from?

• Rocks and minerals.

• Remains of organisms that lived millions of years ago.

• Water and air.

• Modern plant material.

When are carbon atoms in fossil fuels released?

• When they are formed.

• When they are burned.

• When they are buried underground.

• When they are exposed to sunlight.

What is the amount of carbon (in gigatons) released into the atmosphere through respiration?

• 50 Gt

• 100 Gt

• 92 Gt

• 7 Gt

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How much carbon (in gigatons) is stored in plants?

• 650 Gt

• 100 Gt

• 92 Gt

• 10 Gt

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What process contributes 7 gigatons of carbon to the atmosphere?

• Photosynthesis

• Respiration

• Burning of fossil fuels

• Land clearing

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Which process removes 100 gigatons of carbon from the atmosphere?

• Respiration

• Photosynthesis

• Burning of fossil fuels

• Biological and chemical processes

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