Exploring the Carbon Cycle and Its Importance

The video introduces the carbon cycle, explaining the importance of carbon in life forms and its role in energy transfer. It details the carbon cycle process, including sources, sinks, and reservoirs. The video also highlights the imbalance between carbon sources and sinks, leading to global warming, and emphasizes the need for more trees to mitigate this effect.

Why is carbon essential for plants?

• It is needed for photosynthesis.

• It helps them absorb water.

• It helps them reproduce.

• It provides structural support.

Which organisms can directly use sunlight as a source of energy?

• All living organisms

• Only plants, algae, and some bacteria

• Only humans

• Only animals

What percentage of the human body is made up of carbon by weight?

• 10%

• 18%

• 25%

• 30%

Which of the following is NOT a reason why carbon is important?

• It is the base of all organic compounds.

• It is necessary for generating energy in industries.

• It is the main component of water.

• It is a key ingredient of fossil fuels.

What are carbon sources?

• Elements that convert carbon into oxygen

• Elements that store carbon for long periods

• Elements that release carbon into the atmosphere

• Elements that absorb carbon from the atmosphere

Which of the following is an example of a carbon sink?

• Respiration of animals

• Plants

• Volcanic eruptions

• Combustion of fossil fuels

What are carbon reservoirs?

• Elements that absorb carbon from the atmosphere

• Elements that convert carbon into oxygen

• Elements that release carbon into the atmosphere

• Elements that store carbon in various forms

Which of the following is NOT a carbon reservoir?

• Oceans

• Rocks and soil

• Earth's atmosphere

• Sunlight

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

• Metamorphism

• Photosynthesis

• Combustion

• Respiration

What is the impact of an imbalance between carbon sources and sinks?

• It causes global cooling.

• It increases oxygen levels.

• It has no impact on the environment.

• It leads to global warming.