Oxygen Cycle

________________ could increase the amount of oxygen in the air.

• Building more houses

• Burning more oil

• Paving more streets

• Planting more trees

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Which statement is an example of how plants and animals depend on each other?

• animals provide food for plants

• animals provide water for plants

• animals provide oxygen for plants

• animals provide carbon dioxide for plants

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Which statement is true about the carbon dioxide-oxygen cycle?

• animals breathe in nitrogen and release oxygen which is used by plants

• animals breathe in oxygen and release carbon dioxide which is used by plants

• animals breathe in nitrogen and release carbon dioxide which is used by plants

• animals breathe in carbon dioxide and release oxygen which is used by plants

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The class decided to have a terrarium.  The teacher says it is important to include both plants and animals.  Why is it necessary to include both plants and animals?

• plants provide food for the animals and animals provide water for the plants

• plants provide water for the animals and animals provide food for the plants

• plants provide carbon dioxide for the animals and animals provide oxygen for the plants

• plants provide oxygen for animals and the animals provide carbon dioxide for the plants

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The carbon dioxide/oxygen cycle is important to animals because it provides

• oxygen they take in when breathing

• chemicals that build bones

• carbon dioxide that animals need for respiration

• fresh water for their survival

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The diagram shows the flow of organic molecules through an ecosystem. What two processes are identified by the labels X and Y?

• X : Respiration
  Y : Predation

• X : Adaptation
  Y : Decomposition

• X : Fermentation
  Y : Nitrogen Fixation

• X : Decomposition
  Y : Respiration

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What is happening at 2?

• respiration: releasing CO₂

• decomposing CO₂ in the soil

• photosynthesis: absorbing CO₂

• turning CO₂ from the atmosphere into organic molecules

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If all the trees on Earth were destroyed, what would be the effect on humans?

• there would be a lack of food

• there would be a lack of oxygen

• there would be a lack of fresh water

• there would be a lack of carbon dioxide

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Which of the following add carbon dioxide to the atmosphere?

• volcanoes

• combustion of fossil fuels

• animal and plant respiration

• all of these

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How plants and animals interact in the CO2/O cycle?

• Plants release O into the atmosphere which animals inhale. Animals exhale CO2 into the atmosphere which is breath in by plants.

• Animals release O into the atmosphere which plants inhale. Plants exhale CO2 into the atmosphere which is breath in by animals.

• Plants and animals don't need each other.

• Plants and animals take in O and release CO2.

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