Refer to the Figure

question 32

Multiple Choice

Refer to the figure.
Based on the figure, which statement about Davidson and Andrewartha's experiment on thrips (Thrips imaginis) is true?

• A) Davidson and Andrewartha's model of thrips per rose was exactly the same as the observed numbers.
• B) The predicted numbers closely resembled the observed numbers.
• C) The observed numbers of thrips was always lower that the predicted model but showed the same general trends.
• D) The predicted numbers model accurately reflected the observed numbers some years but in other years the predicted model was very different than the observed numbers of thrips.

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Definitions:

Output Effect

The possibility that when the price of the first of a pair of substitute resources falls, the quantity demanded of both resources will rise because the reduction in the price of the first resource so greatly reduces production costs that the volume of output created with the two resources increases by so much that the quantity demanded of the second resource increases even after accounting for the substitution effect.

Pasture Land

This term describes land that is used for the grazing of livestock such as cows and sheep.

Productivity

The measure of how efficiently goods and services are produced, often assessed by the output per unit of input, such as labor or capital.

Graze Cattle

The process of feeding cattle by allowing them to roam and eat grass or other ground vegetation.