The video explains the oxygen cycle, highlighting the movement of oxygen between living (biotic) and non-living (abiotic) factors. It describes the major reservoirs of oxygen on Earth, including the lithosphere, atmosphere, hydrosphere, and biosphere. The video details processes that produce and consume oxygen, such as photosynthesis, cellular respiration, decomposition, oxidation, and combustion. It emphasizes the balance maintained by these processes to keep oxygen levels stable in the atmosphere.

What is the primary role of the oxygen cycle on Earth?

• To maintain oxygen levels in the atmosphere

• To produce carbon dioxide

• To create new minerals

• To regulate water levels

Where is the largest reservoir of Earth's oxygen found?

• Lithosphere

• Hydrosphere

• Biosphere

• Atmosphere

What percentage of the atmosphere is made up of oxygen?

• 50%

• 22%

• 33%

• 21%

Which organisms are primarily responsible for releasing oxygen into the atmosphere?

• Fungi

• Marine plants

• Animals

• Bacteria

What is the main purpose of cellular respiration in organisms?

• To absorb sunlight

• To produce oxygen

• To create ATP

• To release nitrogen

How does sunlight contribute to oxygen production?

• By heating the atmosphere

• By reacting with water vapor

• By breaking down carbon dioxide

• By evaporating water

What process involves oxygen to create rust on metals?

• Oxidation

• Photosynthesis

• Combustion

• Decomposition

Which process uses oxygen to break down once-living organisms?

• Oxidation

• Combustion

• Decomposition

• Photosynthesis

What is required for the combustion of fossil fuels?

• Nitrogen

• Carbon dioxide

• Hydrogen

• Oxygen

What ensures the balance of oxygen levels between producers and consumers?

• Constant sunlight

• Continuous movement of oxygen

• Stable temperatures

• High humidity