Oxygen and Its Role in Nature

The video explains the oxygen cycle, highlighting oxygen's presence in the atmosphere, hydrosphere, and lithosphere. It discusses oxygen's reactivity and its various forms, such as O2, H2O, and CO2. The cycle involves both biotic and abiotic components, with oxygen being produced and consumed in processes like photosynthesis and respiration. The video also covers the role of oxygen in chemical reactions and the formation of ozone.

What percentage of the atmosphere is made up of oxygen?

• 18%

• 21%

• 25%

• 30%

What is the term for the circulation and recycling of oxygen within the biosphere?

• Water Cycle

• Carbon Cycle

• Nitrogen Cycle

• Oxygen Cycle

Which of the following is NOT a form in which oxygen is found?

• O2

• H2O

• CO2

• N2

In which process is oxygen released?

• Decomposition

• Respiration

• Combustion

• Photosynthesis

What are microorganisms that do not require oxygen called?

• Prokaryotes

• Anaerobes

• Aerobes

• Eukaryotes

What is the chemical formula for ozone?

• CO2

• H2O

• O3

• O2