Biogeochemical Cycle

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

• Atmosphere

• Forests

• Soil

• Oceans

Which process releases carbon dioxide into the atmosphere during the carbon cycle?

• Volcanic eruptions

• Photosynthesis and decomposition of organic matter

• Respiration and combustion of fossil fuels

• Burning of plastic waste

What is the role of decomposers in the carbon cycle?

• Decomposers convert carbon into oxygen

• Decomposers break down dead organic matter and release carbon back into the atmosphere as carbon dioxide.

• Decomposers absorb carbon from the atmosphere

• Decomposers have no impact on the carbon cycle

What is denitrification in the nitrogen cycle?

• The transformation of nitrates into ammonia by fungi

• Conversion of nitrates into nitrogen gas by bacteria

• The breakdown of ammonia into nitrites by plants

• The process of converting nitrogen gas into nitrates

How do plants utilize nitrogen in the nitrogen cycle?

• Plants release nitrogen into the atmosphere as a waste product

• Plants absorb nitrogen from the soil in the form of nitrates or ammonium and incorporate it into essential molecules.

• Plants convert nitrogen into carbon dioxide for energy production

• Plants store excess nitrogen in their roots for future use

What is transpiration in the water cycle?

• Transpiration is the process where animals release water vapor through their skin.

• Transpiration is the process where water is absorbed by plants from the soil.

• Transpiration is the process where clouds release water vapor into the atmosphere.

• Transpiration is the process where plants release water vapor through small pores in their leaves.

What is the primary source of phosphorus for living organisms in the phosphorus cycle?

• Phosphorus-rich fruits and vegetables

• Phosphorus gas in the atmosphere

• Phosphate minerals in rocks and soil

• Phosphorus-rich seawater

How does phosphorus return to the soil in the phosphorus cycle?

• Weathering of rocks

• Evaporation from water bodies

• Volcanic eruptions

• Photosynthesis by plants

What is the significance of the carbon cycle in maintaining Earth's climate?

• The carbon cycle leads to increased oxygen levels, not climate regulation

• The carbon cycle only affects marine life, not climate

• The carbon cycle has no impact on Earth's climate

• The carbon cycle helps regulate the amount of carbon dioxide in the atmosphere, which in turn influences Earth's climate.

Why is nitrogen fixation important in the nitrogen cycle?

• Nitrogen fixation converts atmospheric nitrogen gas into a usable form for plants.

• Nitrogen fixation is only important for aquatic ecosystems

• Nitrogen fixation inhibits plant growth

• Nitrogen fixation releases nitrogen gas back into the atmosphere