The Carbon Cycle

During the carbon cycle plants take in carbon dioxide from the atmosphere and incorporate it into their cells. What is this called?

• Combustion

• Decomposition

• Photosynthesis

• Consumption

Organisms take in oxygen and glucose and, during a chemical reaction, convert it into oxygen and water to release energy. What is this called?

• Photosynthesis

• Respiration

• Combustion

• Decomposition

Bacteria and _____________ are both examples of decomposers

• Trees

• Farm animals

• Humans

• Fungi

Cows eating grass and humans using petrol in their cars are both examples of what?

• Consumption

• Combustion

• Respiration

• Photosynthesis

Over millions of years dead organic matter gets compressed to form fossil fuels. Which one below is not an example of a fossil fuel

• Gas

• Fossils

• Oil

• Coal

_____________ is an essential element of all living creatures.

• Gold

• Carbon

• Carbon dioxide

• Silver

Bacterias that decompose dead plants release _____________ back into the atmosphere.

• water

• nitrogen

• oxygen

• carbon

When humans burn fossil fuels, most of the carbon quickly enters the as carbon dioxide.

• Water

• Atmosphere

• Sun

• Air

Which one of these does not add CO2 to the atmosphere?

• cooking with gas

• planting trees

• burning wood

• riding in a bus

Combustion is another word for _______________.

• a train

• a bus

• a dog

• burning