Farmers Sprayed Leechi Trees to Suppress Populations of Scale Insects

question 26

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 existed in the trees now because

• A)they,too,are insects so they are opportunistic species.
• B)both insects were equilibrium species and resistance was a matter of chance.
• C)the predator was an opportunistic species and was therefore more susceptible to the spray.
• D)the scale insect was an opportunistic species and the high number of young included a resistant strain; the predator was an equilibrium species and will take longer to produce a resistant variety.
• E)they had reached their carrying capacity and thus their numbers decreased due to environmental resistance.

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