Exploring the Carbon, Oxygen & Nitrogen Cycles

What are the main organisms involved in the carbon and oxygen cycles?

• Insects and reptiles

• Fish and birds

• Plants and animals

• Bacteria and fungi

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What is the process called where plants absorb carbon dioxide and produce glucose?

• Decomposition

• Photosynthesis

• Nitrogen fixation

• Respiration

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How does an increase in the number of plants affect atmospheric carbon levels?

• Decreases carbon levels

• Has no effect on carbon levels

• Increases oxygen levels

• Increases carbon levels

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What is the impact of deforestation on atmospheric carbon and oxygen levels?

• Increases carbon and decreases oxygen

• Decreases carbon and increases oxygen

• Increases both carbon and oxygen

• Decreases both carbon and oxygen

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What role do oceans play in the carbon cycle?

• They convert carbon into oxygen

• They release carbon into the atmosphere

• They have no role in the carbon cycle

• They store a large amount of carbon

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What is the role of legumes in the nitrogen cycle?

• They decompose organic matter

• They release nitrogen into the atmosphere

• They fix nitrogen from the air into a solid form

• They convert nitrogen into oxygen

What happens to nitrogen when plants decompose?

• It is broken down by denitrifying bacteria

• It is absorbed by other plants

• It is released into the atmosphere

• It remains in the soil

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Which process ensures the cycling of fresh water in the environment?

• Respiration

• Water cycle

• Nitrogen fixation

• Photosynthesis

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Why do plants need nitrogen?

• To produce glucose

• To grow and make proteins

• To absorb carbon dioxide

• To release oxygen

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What are the key processes involved in the water cycle?

• Nitrogen fixation and decomposition

• Photosynthesis and respiration

• Evaporation, condensation, and precipitation

• Carbon absorption and release

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