Carbon and Nitrogen Cycle Flashcard

Front

What is the main reason plants and animals cannot use nitrogen directly from the air?

Back

Plants and animals cannot use nitrogen directly from the air because nitrogen gas (N2) is not in a form that they can absorb. They rely on nitrogen-fixing bacteria to convert it into usable forms like ammonia.

Front

What essential biological molecules are built using nitrogen?

Back

Nitrogen is essential for building proteins, which are crucial for the structure and function of living organisms.

Front

What are the processes that add carbon dioxide to the atmosphere?

Back

Processes that add carbon dioxide to the atmosphere include volcanic eruptions, combustion of fossil fuels, and respiration by animals and plants.

Front

What is respiration in the context of the carbon cycle?

Back

Respiration is the process by which living organisms convert glucose and oxygen into energy, releasing carbon dioxide (CO2) as a byproduct.

Front

Which organisms are involved in the carbon cycle?

Back

All living things, including plants, animals, and bacteria, are involved in the carbon cycle.

Front

What role do plants play in the carbon cycle?

Back

Plants absorb carbon dioxide from the atmosphere during photosynthesis and convert it into organic matter.

Front

What is nitrogen fixation?

Back

Nitrogen fixation is the process by which nitrogen gas from the atmosphere is converted into ammonia or related compounds in the soil, making it available for plants.

Front

How do decomposers contribute to the nitrogen cycle?

Back

Decomposers break down dead organic matter, releasing nitrogen back into the soil in forms that plants can use.

Front

What is the significance of the carbon cycle for the environment?

Back

The carbon cycle is crucial for regulating Earth's climate and supporting life by recycling carbon among the atmosphere, land, and oceans.

Front

What is photosynthesis?

Back

Photosynthesis is the process by which green plants use sunlight to convert carbon dioxide and water into glucose and oxygen.