Which Principle of Heat Exchange Is the Most Important Explanation

question 39

Multiple Choice

Which principle of heat exchange is the most important explanation for why birds look larger in colder weather because they fluff their feathers?

• A) Fluffing feathers results in less cooling by radiation because feathers emit less infrared radiation than other tissues do.
• B) Fluffing decreases the amount of heat lost by conduction when the bird makes contact with cold objects in its environment.
• C) Fluffing creates a pocket of air near the bird that acts as insulation.
• D) Fluffing decreases the surface-area-to-volume ratio, thus decreasing the amount of heat lost to the environment.

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Definitions:

Aldaric Acid

A type of dicarboxylic sugar acid obtained by oxidizing both the aldehyde and primary alcohol groups of an aldose sugar.

Optically Active

A characteristic of a compound that has the ability to rotate the plane of polarized light, caused by the presence of asymmetry in the molecule.

Bromine Water

An aqueous solution of bromine used as a reagent in organic chemistry, particularly in tests for unsaturation.

Aldaric Acid

A type of sugar acid obtained by oxidizing both the aldehyde group and the primary alcohol group of an aldose to carboxylic acids.