Exploring Biogeochemical Cycles

Which of the following processes is primarily responsible for the removal of carbon dioxide from the atmosphere?

• Respiration

• Photosynthesis

• Combustion

• Decomposition

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DOK Level 1: Recall

• Nitrification

• Denitrification

• Nitrogen fixation

• Ammonification

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DOK Level 1: Recall

Explain how human activities can impact the carbon cycle. Provide at least two examples.

• Overfishing and urbanization have no impact on the carbon cycle.

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DOK Level 3: Strategic Thinking

What is the main reservoir of phosphorus in the phosphorus cycle?

• Atmosphere

• Oceans

• Rocks and sediments

• Living organisms

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DOK Level 1: Recall

Describe the role of bacteria in the nitrogen cycle.

• Bacteria are involved in nitrogen fixation and denitrification.

• Bacteria only decompose organic matter.

• Bacteria convert ammonia to nitrogen gas directly.

• Bacteria have no role in the nitrogen cycle.

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DOK Level 2: Skill/Concept

Which of the following is a key process in the water cycle that involves the movement of water from plants to the atmosphere?

• Evaporation

• Transpiration

• Precipitation

• Condensation

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DOK Level 1: Recall

How does the phosphorus cycle differ from the carbon and nitrogen cycles in terms of its atmospheric component?

• The phosphorus cycle has a significant atmospheric component.

• The phosphorus cycle lacks a gaseous phase.

• The phosphorus cycle is entirely atmospheric.

• The phosphorus cycle is faster than the carbon and nitrogen cycles.

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DOK Level 2: Skill/Concept

Identify the process in the carbon cycle where carbon is transferred from living organisms to the atmosphere.

• Photosynthesis

• Respiration

• Sedimentation

• Weathering

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DOK Level 1: Recall

Evaluate the impact of agricultural practices on the nitrogen cycle and suggest sustainable practices to mitigate negative effects.

• Use of synthetic fertilizers increases nitrogen runoff; crop rotation and cover cropping can mitigate this.

• Organic farming has no impact on the nitrogen cycle.

• Pesticide use directly increases atmospheric nitrogen.

• Irrigation practices reduce nitrogen levels in soil.

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DOK Level 3: Strategic Thinking

Which process in the water cycle is responsible for the formation of clouds?

• Evaporation

• Transpiration

• Condensation

• Precipitation

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DOK Level 1: Recall