Farmers Sprayed Litchi Trees to Suppress Populations of Scale Insects

question 6

Multiple Choice

Farmers sprayed litchi trees to suppress populations of scale insects.However,the spray also killed populations of a predatory lacewing that controlled the scales.Soon the spraying did no good,and the damage to the litchi 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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