Revision Week 2 - Air

Which of the following component of air CANNOT be taken directly by plants?

• Nitrogen (N₂)
• None of these

• Oxygen (O₂)

• Carbon dioxide(CO₂)

Which of the following factors is a cause of air pollution ?

• Growing more trees

• Using public transportation more

• Burning more wood

• Saving electricity

Which of the following organisms can produce oxygen?

• insects

• plants

• amphibians

• fish

What are the main components of air ?

• oxygen and nitrogen

• oxygen, Argon, and water vapor

• oxygen, nitrogen and other gases

• oxygen and carbon dioxide

What gas accounts for 1% of air?

• Oxygen

• Nitrogen

• Other gases

• Carbon dioxide and Oxygen

What percentage of air is nitrogen?

• 78%

• 1%

• 21 %

• 68%

What of the following human activities pollutes air?

• Humans talking

• Humans walking

• Humans doing exercises

• Humans using vehicles

Which of the following activities reduces air pollution?

• Using more vehicles

• Burning trees

• Using public transportation

• Releasing harmful gases from factories

Which of the following statements is true about nitrogen?

• it is needed for plants during photosynthesis

• Living things need it for breathing

• It is a colourless and odourless gas. It prevents rapid burning.

• It is a yellow odourless gas.

Which air keeps the earth warm and is used for photosynthesis?

• oxygen (O₂)

• oxygen and nitrogen

• carbon dioxide (CO₂)

• nitrogen (N₂)