Carbon cycle

What is the role of algae in the carbon cycle?

• Algae absorb carbon dioxide during photosynthesis, contributing to the carbon cycle and producing oxygen.

• Algae release carbon dioxide during respiration, increasing atmospheric CO2 levels.

• Algae serve as a food source for herbivores, impacting the carbon cycle indirectly.

• Algae have no significant role in the carbon cycle.

What are fossil fuels?

• Natural substances formed from the remains of ancient organisms, including coal, oil, and natural gas.

• Renewable energy sources derived from sunlight and wind.

• Minerals extracted from the earth's crust used for construction.

• Synthetic materials created in laboratories for industrial use.

What is photosynthesis?

• A process by which plants absorb nutrients from the soil.

• A method used by animals to breathe oxygen.

• The process by which green plants and some other organisms use sunlight to synthesize foods with the help of carbon dioxide and water, releasing oxygen as a byproduct.

• A technique for storing energy in the form of fat.

What process do plants use to absorb carbon dioxide?

• Respiration

• Photosynthesis

• Transpiration

• Fermentation

What is respiration in the context of the carbon cycle?

• The process by which plants absorb carbon dioxide and release oxygen.

• The process by which living organisms convert oxygen and glucose into energy, releasing carbon dioxide back into the atmosphere.

• The process of photosynthesis where sunlight is converted into chemical energy.

• The process of nitrogen fixation in soil by bacteria.

How do animals contribute to the carbon cycle?

• By photosynthesis, which absorbs carbon dioxide from the atmosphere.

• Through respiration, which releases carbon dioxide into the atmosphere.

• By storing carbon in their bodies as fat and protein.

• By decomposing organic matter and releasing oxygen.

True or False: All carbon in existence is continually recycled in the carbon cycle.

• True

• False

• Only some carbon is recycled

• Carbon is created and destroyed

How does deforestation affect the carbon cycle?

• Deforestation increases the number of trees available to absorb carbon dioxide, decreasing the amount of carbon in the atmosphere.

• Deforestation has no effect on the carbon cycle.

• Deforestation reduces the number of trees available to absorb carbon dioxide, increasing the amount of carbon in the atmosphere.

• Deforestation helps to improve the carbon cycle by promoting tree growth.

What is the significance of the carbon cycle?

• It is essential for regulating Earth's climate, supporting life, and maintaining the balance of ecosystems.

• It primarily affects ocean currents and weather patterns.

• It is responsible for the formation of fossil fuels and minerals.

• It has no significant impact on the environment.

What is the main source of carbon dioxide in the atmosphere?

• Photosynthesis by plants

• Burning fossil fuels, respiration of living organisms, and volcanic eruptions.

• Ocean absorption of carbon dioxide

• Decomposition of organic matter