Quiz on Environmental Cycles and Forces

What gas do plants produce during photosynthesis?

• Carbon dioxide

• Oxygen

• Nitrogen

• Hydrogen

What gas do animals and humans exhale?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

Which process do plants use to make their own food?

• Respiration

• Photosynthesis

• Combustion

• Decomposition

What is released as a byproduct of photosynthesis?

• Oxygen

• Carbon dioxide

• Water vapor

• Nitrogen

How do decomposers help in the oxygen-carbon dioxide cycle?

• They take in oxygen and release carbon dioxide.

• They take in carbon dioxide and release oxygen.

• They stop the cycle.

• They produce fossil fuels.

What happens to carbon when plants and animals decompose?

• It disappears.

• It turns into oxygen.

• It is released as carbon dioxide.

• It forms new organisms.

Which activity releases carbon dioxide into the air?

• Photosynthesis

• Respiration

• Combustion

• Both b and c

Why is the oxygen and carbon dioxide cycle important?

• It provides oxygen for living things.

• It maintains the balance of gases in the atmosphere.

• It removes excess carbon dioxide.

• All of the above

What would happen if there were no plants?

• More oxygen would be available.

• Carbon dioxide levels would rise.

• More animals would survive.

• There would be no changes.

Which of the following is NOT a part of the oxygen-carbon dioxide cycle?

• Photosynthesis

• Respiration

• Decomposition

• Melting ice