CO2 Cycle Question Preview (ID: 37067)


5.9D. TEACHERS: click here for quick copy question ID numbers.

Which component do animals add to the atmosphere when they breathe?
a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Hydrogen

When plants make their own food, they add what gas to the atmosphere?
a) Nitrogen
b) Carbon dioxide
c) Oxygen
d) Hydrogen

Plants are important to all animals, even animals that eat only meat, because plants provide a resource animals need for -
a) protection
b) breathing
c) reproduction
d) drinking

Plants and animals that live on land exchange carbon dioxide and oxygen through the –
a) food chain
b) ocean
c) soil
d) atmosphere

What gas would eventually decrease if a large number of plants in a forest habitat were removed?
a) Nitrogen
b) Oxygen
c) Hydrogen
d) Carbon dioxide

Plants play a role in the carbon dioxide and oxygen cycle when they absorb -
a) oxygen and give off carbon dioxide
b) hydrogen and give off oxygen
c) hydrogen and give off carbon dioxide
d) carbon dioxide and give off oxygen

Carbon dioxide is a gas found in the Earth’s atmosphere. Animals expel carbon dioxide into the atmosphere as part of -
a) growth
b) respiration
c) reproduction
d) feeding

What resource, given off by plants as their contribution to the carbon dioxide-oxygen cycle, is necessary for the survival of animals?
a) Sunlight
b) Water
c) Carbon dioxide
d) Oxygen

Plants are important to the survival of animals because plants –
a) take in water and nutrients through their roots
b) produce oxygen and add it to the atmosphere
c) grow upwards in order to collect sunlight
d) sometimes use the wind to spread their seeds

Huge areas of the Amazon Rainforest are being cut down. What effect could this have on the carbon-dioxide and oxygen cycle if the removal of so many plants and trees continues?
a) Carbon dioxide levels increase
b) Oxygen levels increase
c) Carbon dioxide levels decrease
d) Nitrogen levels decrease

The carbon dioxide-oxygen cycle is important to animals because it provides –
a) a gas they take in when breathing
b) fresh water for their survival
c) chemicals that build bones
d) energy they need to move

Which of the following could increase the amount of oxygen in the air?
a) Building more houses
b) Paving more streets
c) Planting more trees
d) Burning more oil

To give up one thing and replace it with another
a) A. Carbon dioxide
b) Oxygen
c) Photosynthesis
d) Exchange

A gas released into the air by plants
a) Carbon dioxide
b) Oxygen
c) Photosynthesis
d) Exchange

A gas released into the air by animals
a) Carbon dioxide
b) Oxygen
c) Photosynthesis
d) Exchange

A set of events that occurs over and over again
a) Oxygen
b) Photosynthesis
c) Exchange
d) Cycle

The process by which plants make their own sugar for food
a) Carbon dioxide
b) Oxygen
c) Photosynthesis
d) Exchange

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