BC science 9: 4.4 - 4.5 Quiz

How do living organisms return carbon to the atmosphere in the carbon cycle?

• respiration and photosynthesis
•  decomposition and respiration

Which of the following add carbon dioxide to the atmosphere?

• volcanoes
• combustion of fossil fuels
• animal and plant respiration
• all of these

Organisms that do not decompose can be buried and become what?

• water
• nutrients
• air
• fossil fuels

The average temperature of the surface of Earth has increased approximately 1°C in the past century. Which reason best explains this increase in temperature?

• lower levels of ozone in the atmosphere
• lower levels of nitrogen in the atmosphere
• higher levels of carbon dioxide and other greenhouse gases in the atmosphere
• higher levels of oxygen in the atmosphere

With the help of the Sun, through the process of photosynthesis, carbon dioxide is pulled from the air to make plant________

• leaves

• food

• roots

• nutrients

Through food chains, the carbon that is in plants moves to the animals that eat them. When an animal eats another animal, carbon is ___________________.

• released

• transferred

• dissolved

• gone

Which process contributes carbon dioxide to the atmosphere?

• respiration

• photosynthesis

• tree farms

Which of the following is correct?

• There is as much carbon on earth as when it was formed

• Carbon is being created whenever it is recycled

• Carbon is lost every time it is recycled

• Carbon changes to different forms and is never recovered

Respiration is the process by which animals take in _____ and release _____ to make energy. 

• photosynthesis, air
• carbon, oxygen
• oxygen
• oxygen, carbon dioxide

How does the carbon in grass become part of a lion?

• The lion eats the grass
• Carbon from grass doesn't end up in a lion. 
• The carbon ends up in the lion's food chain. 
• The lion breathes in carbon given out by the plant