Farmers Sprayed Leechi Trees to Suppress Populations of Scale Insects

question 47

Multiple Choice

Farmers sprayed leechi trees to suppress populations of scale insects. This also killed the populations of a predatory lacewing that controlled the numbers of scales. Soon the spraying did no good, and the damage to the leechi from the scales was greater than before spraying had occurred. Few predatory lacewings exist in the trees now because

• A) they, too, are insects so they are r-selected.
• B) the scale insect was K-selected and the high number of young included a resistant strain, while the predator was r-selected and will take longer to produce a resistant variety.
• C) the predator was r-selected and was therefore more susceptible to the spray.
• D) the scale insect was r-selected and the high number of young included a resistant strain; the predator was K-selected and will take longer to produce a resistant variety.

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A description of a product's demand when its price elasticity is less than one, indicating that demand is relatively unresponsive to price changes.

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