Carbon & Nitrogen Cycles

What is the greenhouse effect?

• The cooling of the Earth's surface due to the depletion of ozone layer.

• The warming of the Earth's surface due to trapped greenhouse gases like carbon dioxide.

• The process of photosynthesis in plants that absorbs carbon dioxide.

• The increase in Earth's temperature due to solar radiation only.

How does cellular respiration relate to the carbon cycle?

• Cellular respiration releases oxygen into the atmosphere as organisms break down glucose for energy.

• Cellular respiration releases carbon dioxide back into the atmosphere as organisms break down glucose for energy.

• Cellular respiration converts carbon dioxide into glucose for energy.

• Cellular respiration has no effect on the carbon cycle.

What human activity negatively affects the nitrogen cycle?

• Overusing fertilizers negatively affects the nitrogen cycle.

• Planting cover crops to improve soil health.

• Implementing crop rotation for sustainable agriculture.

• Reducing fossil fuel consumption to lower emissions.

How does decomposition contribute to the nitrogen cycle?

• Decomposition releases carbon dioxide into the atmosphere.

• Decomposition recycles nutrients back into the soil, making nitrogen available for plants.

• Decomposition prevents nitrogen from entering the soil.

• Decomposition increases the acidity of the soil.

What is denitrification?

• The process of converting nitrogen gas into ammonia by bacteria.

• The process by which nitrogen gas is released back into the atmosphere by bacteria.

• The process of absorbing nitrogen from the atmosphere by plants.

• The process of breaking down nitrogen compounds in soil by fungi.

What is eutrophication and how is it related to the nitrogen cycle?

• Eutrophication is the excessive growth of algae in water bodies due to high nitrogen levels, often from fertilizers.

• Eutrophication is the process of nitrogen fixation in soil by bacteria.

• Eutrophication refers to the depletion of oxygen in water bodies due to overfishing.

• Eutrophication is the natural process of nutrient cycling in terrestrial ecosystems.

What would happen if bacteria were removed from this ecosystem?

• Nitrogen would not be available in a form that plants and animals can use.

• Plants would grow faster due to less competition.

• Animals would thrive without bacteria in the soil.

• The ecosystem would become more diverse without bacteria.

Why is nitrogen important for living organisms?

• It is a primary source of energy for cells.

• It is a key component of amino acids and nucleic acids, essential for protein and DNA synthesis.

• It helps in the formation of carbohydrates.

• It is necessary for the absorption of water in plants.

Which type of organism fixes carbon?

• Consumers

• Decomposers

• Producers

• Detritivores

What is the role of producers in the carbon cycle?

• Producers convert carbon dioxide into organic matter through photosynthesis.

• Producers release carbon dioxide into the atmosphere during respiration.

• Producers absorb carbon from the soil to grow.

• Producers decompose organic matter to release carbon back into the environment.