Biogeochemical Cycle Review

How can changes in one cycle (e.g., carbon) impact another cycle (e.g., nitrogen)?

• Changes in the nitrogen cycle have no effect on carbon levels.

• Carbon and nitrogen cycles operate independently of each other.

• Alterations in the carbon cycle only affect plant growth, not nitrogen availability.

• Changes in the carbon cycle can influence nitrogen availability and cycling in ecosystems.

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What is the primary process by which carbon dioxide is removed from the atmosphere?

• Respiration

• Decomposition

• Combustion

• Photosynthesis

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What is nitrogen fixation?

• Nitrogen fixation is the process of converting ammonia into atmospheric nitrogen.

• Nitrogen fixation occurs only in aquatic environments.

• Nitrogen fixation is the conversion of atmospheric nitrogen into ammonia or related compounds, making nitrogen available for plants.

• Nitrogen fixation is the breakdown of nitrogen compounds in soil.

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What is the primary form of phosphorus found in nature?

• Phosphorus pentoxide (P2O5)

• Elemental phosphorus (P)

• Phosphate (PO4^3-)

• Phosphine (PH3)

How do plants connect the water cycle and the carbon cycle?

• Plants absorb carbon dioxide through their roots.

• Plants release oxygen through their roots during respiration.

• Plants use sunlight to convert water into soil nutrients.

• Plants connect the water cycle and the carbon cycle through transpiration and photosynthesis.

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How do plants acquire phosphorus from the soil?

• Plants acquire phosphorus from the soil by absorbing phosphate ions through their roots.

• Plants rely on fungi to extract phosphorus from the soil.

• Phosphorus is taken in through photosynthesis.

• Plants absorb phosphorus through their leaves.

Why is phosphorus considered a limiting nutrient in ecosystems

• Phosphorus is considered a limiting nutrient because its scarcity restricts biological productivity in ecosystems.

• Phosphorus promotes excessive growth in all environments.

• Phosphorus is abundant in all ecosystems.

• Phosphorus is not essential for plant growth.

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Which cycle are fossil fuels (oil, coal, natural gas) part of?

• carbon

• water

• nitrogen

• phosphorus

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When nitrogen gas is turned in to a form that plants and animals can use is called 

• Combustion

• Photosynthesis

• Decomposition

• Nitrogen Fixation

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Organisms that break down dead plants & animals and release nitrogen back into atmosphere...

• bacteria

• plants

• animals

• producers

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