Exploring the Carbon Cycle

Why is carbon considered the backbone for many essential molecules in living things?

• It forms strong bonds with many elements.

• It is the heaviest element in living organisms.

• It is the most abundant element on Earth.

• It is the only element that can form gases.

What process do plants use to convert carbon dioxide into glucose?

• Combustion

• Photosynthesis

• Decomposition

• Respiration

What happens to the carbon content in biological molecules when plants and animals die?

• It evaporates into the atmosphere.

• It is broken down and deposited into the soil.

• It turns into water.

• It remains unchanged.

How do decomposers contribute to the carbon cycle?

• By producing oxygen.

• By absorbing carbon dioxide.

• By eating decomposed bodies and releasing CO2.

• By creating fossil fuels.

What is the primary source of carbon emissions from human activities?

• Photosynthesis

• Respiration

• Burning fossil fuels

• Decomposition

How does the burning of fossil fuels affect the carbon cycle?

• It balances the amount of CO2 in the atmosphere.

• It reduces the amount of CO2 in the atmosphere.

• It adds more CO2 to the atmosphere than plants can absorb.

• It has no effect on the carbon cycle.

Why are fossil fuels considered a stable reservoir of carbon?

• They are quickly replenished.

• They remain in the soil for tens of thousands of years.

• They are easily converted back to CO2.

• They are constantly being used by plants.

What is one of the main problems with the current rate of fossil fuel consumption?

• It creates too much oxygen.

• It disrupts the natural rhythm of the carbon cycle.

• It takes too long to create fossil fuels.

• It reduces the amount of carbon in the soil.

Which of the following is NOT a carbon reservoir mentioned in the video?

• The moon

• Sediments in rocks

• Fossil fuels

• The ocean

What completes the carbon cycle?

• The burning of fossil fuels

• The balance of CO2 between respiration and photosynthesis

• The creation of new carbon molecules

• The decomposition of plants and animals