Which of the Following Statements Is Correct About Biogeochemical Cycling

question 10

Multiple Choice

Which of the following statements is correct about biogeochemical cycling?

• A)The phosphorus cycle involves the recycling of atmospheric phosphorus.
• B)The phosphorus cycle is a cycle that involves the weathering of rocks.
• C)The carbon cycle is a localized cycle that primarily involves the burning of fossil fuels.
• D)The carbon cycle has maintained a constant atmospheric concentration of CO2 for the past million years.
• E)The nitrogen cycle involves movement of diatomic nitrogen between the biotic and abiotic components of the ecosystem.

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Definitions:

Diffusion

The movement of molecules or particles from regions of higher concentration to regions of lower concentration.

Physiological Dead Air Space

The volume of the airways where gas exchange does not occur, including parts of the bronchial tree and trachea.

Anatomic Dead Space

The portion of the respiratory system where gas exchange does not occur, including the nose, trachea, and bronchi, where air is moved in and out without being involved in oxygen/carbon dioxide exchange.

Respiratory Membrane

The thin barrier through which gas exchange occurs between the air in the lungs and the blood in capillaries.