Understanding Earth's Essential Cycles

What is the main process by which carbon dioxide is removed from the atmosphere in the carbon cycle?

• Respiration

• Photosynthesis

• Combustion

• Decomposition

Which of the following is a key role of bacteria in the nitrogen cycle?

• Fixing nitrogen gas into ammonia

• Releasing nitrogen gas into the atmosphere

• Breaking down rocks to release nitrogen

• Absorbing nitrogen from the soil

How does deforestation impact the carbon cycle?

• Increases carbon storage in trees

• Decreases carbon dioxide in the atmosphere

• Increases carbon dioxide in the atmosphere

• Has no impact on the carbon cycle

What is the process called when water vapour cools and changes back into liquid droplets?

• Evaporation

• Precipitation

• Condensation

• Transpiration

Which human activity is a major contributor to the increase of carbon dioxide in the atmosphere?

• Planting trees

• Burning fossil fuels

• Using solar panels

• Recycling

What is the importance of the nitrogen cycle for living organisms?

• It provides oxygen for respiration

• It supplies nitrogen for protein synthesis

• It removes carbon dioxide from the atmosphere

• It provides energy for photosynthesis

Which stage of the water cycle involves water moving from plants to the atmosphere?

• Evaporation

• Transpiration

• Condensation

• Precipitation

What is the role of decomposers in the carbon cycle?

• They fix carbon dioxide into organic matter

• They release carbon dioxide through respiration

• They convert carbon dioxide into oxygen

• They store carbon in their bodies

Which of the following processes converts nitrogen gas into a form that plants can use?

• Nitrification

• Denitrification

• Nitrogen fixation

• Ammonification

Which process in the carbon cycle is primarily responsible for returning carbon to the atmosphere from living organisms?

• Photosynthesis

• Respiration

• Combustion

• Decomposition