The Atmosphere: Oxygen

The video explains the composition of Earth's atmosphere, focusing on oxygen, which makes up 21% of it. Oxygen is produced by photosynthesis and has properties like being colorless, odorless, and tasteless. It is crucial for respiration and forms water and ozone. Oxygen is used in medical applications and industrial processes like welding.

What is the primary force that keeps the Earth's atmosphere in place?

• Gravitational force

• Nuclear force

• Magnetic force

• Electromagnetic force

What percentage of the Earth's atmosphere is made up of oxygen?

• 21%

• 50%

• 1%

• 78%

Which process in plants is responsible for the production of oxygen?

• Fermentation

• Respiration

• Photosynthesis

• Transpiration

What is one of the roles of oxygen in our daily lives?

• It is a primary component of carbon dioxide.

• It is used to create helium.

• It is essential for respiration.

• It is used in the production of nitrogen.

In what form is oxygen stored for medical purposes?

• Dissolved in water

• Solid form in plastic containers

• Compressed gas in iron cylinders

• Liquid form in glass bottles