Exploring the Oxygen Cycle

What is the primary role of the oxygen cycle in Earth's atmosphere?

• To increase the levels of nitrogen

• To maintain a balance of oxygen and carbon dioxide

• To produce more hydrogen

• To decrease the levels of methane

Which process in the oxygen cycle is responsible for releasing oxygen into the atmosphere?

• Respiration

• Photosynthesis

• Combustion

• Decomposition

Tags

NGSS.MS-LS1-6

What was the Great Oxidation Event?

• A period when oxygen levels decreased significantly

• A time when oxygen first appeared in Earth's atmosphere

• An event that caused the extinction of dinosaurs

• A volcanic eruption that released oxygen

Tags

NGSS.MS-LS1-6

How did the Great Oxidation Event change life on Earth?

• It led to the extinction of all life forms

• It allowed for the evolution of aerobic organisms

• It caused a decrease in atmospheric carbon dioxide

• It resulted in the formation of the ozone layer

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

Which organisms are primarily responsible for the production of oxygen during the Great Oxidation Event?

• Animals

• Fungi

• Cyanobacteria

• Viruses

What is the chemical equation for photosynthesis, the process that adds oxygen to the atmosphere?

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following processes removes oxygen from the atmosphere?

• Photosynthesis

• Respiration

• Evaporation

• Condensation

What is the significance of the ozone layer in the oxygen cycle?

• It absorbs harmful ultraviolet radiation

• It releases oxygen into the atmosphere

• It converts carbon dioxide into oxygen

• It stores excess oxygen

Which gas was most abundant in Earth's atmosphere before the Great Oxidation Event?

• Oxygen

• Nitrogen

• Methane

• Carbon dioxide

How does human activity impact the oxygen cycle?

• It increases the amount of oxygen produced by plants

• It decreases the levels of carbon dioxide in the atmosphere

• It can lead to deforestation, reducing oxygen production

• It has no impact on the oxygen cycle

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3