Carbon and Nitrogen Cycles

Front

What are fossil fuels?

Back

Fossil fuels are natural substances formed from the remains of ancient organisms, buried and subjected to heat and pressure over millions of years. Examples include coal, oil, and natural gas.

Front

How does carbon move through the food chain?

Back

Carbon moves through the food chain when organisms consume other organisms. For example, a lion gets carbon by eating an antelope that has eaten grass.

Front

What is nitrogen fixation?

Back

Nitrogen fixation is the process of converting nitrogen gas from the atmosphere into a usable form for plants, primarily through the action of bacteria and lightning.

Front

Which human activity does not contribute to CO2 emissions?

Back

Planting trees does not add CO2 to the atmosphere; in fact, it helps absorb CO2.

Front

What is the greenhouse effect?

Back

The greenhouse effect is the warming of Earth's surface due to the trapping of heat by greenhouse gases like carbon dioxide and methane in the atmosphere.

Front

What role do decomposers play in the carbon cycle?

Back

Decomposers break down dead organic matter, returning carbon to the soil and atmosphere, thus playing a crucial role in recycling nutrients.

Front

What is the significance of photosynthesis in the carbon cycle?

Back

Photosynthesis is the process by which plants convert carbon dioxide and sunlight into glucose and oxygen, thus removing CO2 from the atmosphere.

Front

How do human activities impact the nitrogen cycle?

Back

Human activities, such as the use of fertilizers, can increase nitrogen levels in the soil and water, leading to pollution and ecosystem imbalances.

Front

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

Back

The main sources of carbon dioxide in the atmosphere include burning fossil fuels, deforestation, and industrial processes.

Front

What is the role of lightning in the nitrogen cycle?

Back

Lightning helps fix nitrogen by converting atmospheric nitrogen into nitrates, which can be absorbed by plants.