What Possible Sources of Energy May Be Used by Microbes

question 41

Multiple Choice

What possible sources of energy may be used by microbes that live deep within the Earth?

• A)carbon dioxide and oxygen
• B)hydrogen gas and ferrous iron
• C)nitrate and sulfate
• D)sulfate and ferric iron
• E)nitrate and ferric iron

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Definitions:

Stomatal Closing

The process by which plants reduce the aperture of stomata in their leaves to decrease water loss and gas exchange; often in response to environmental stressors.

Circadian Rhythms

Biological processes or cycles that occur on a roughly 24-hour schedule in living organisms, governing physiological and behavioral changes.

Continual Darkness

An environmental condition where there is a constant absence of light, which can affect growth, behavior, and biological rhythms in organisms.

Stomata

Small openings on the surface of plant leaves and stems that allow for gas exchange between the environment and the plant's internal tissues.