When an Arborist Prunes a Limb Off a Valuable Tree,he

question 53

Multiple Choice

When an arborist prunes a limb off a valuable tree,he or she usually paints the cut surface.The primary purpose of the paint is to

• A)minimize water loss by evaporation from the cut surface.
• B)improve the appearance of the cut surface.
• C)stimulate growth of the cork cambium to "heal" the wound.
• D)block entry of pathogens through the wound.

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Definitions:

Representative

Someone or something that serves as a typical example of a group, class, or quality.

Experimenter Effects

Unintended influences that the experimenter's presence or actions may have on the results of an experiment.

Single-blind Studies

Experimental studies in which the participants do not know which experimental group they belong to (e.g., control or treatment), but the researchers do.

Dependent Variable

In an experiment, it is the variable that is tested and measured, expected to change as a result of manipulations of the independent variable.