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Which of the following is the primary advantage of using biocontrol agents (like Bt, Trichoderma, baculoviruses) over chemical pesticides?
AThey never need to be applied
BThey work faster than chemicals
CThey are cheaper to produce
DThey are species-specific (narrow-spectrum), do not harm non-target organisms, and reduce environmental pollution from broad-spectrum toxic chemicals
Answer & Solution
Correct answer: D. They are species-specific (narrow-spectrum), do not harm non-target organisms, and reduce environmental pollution from broad-spectrum toxic chemicals
**Biocontrol advantages**: (i) **species-specific** — kill only the target pest, sparing beneficial insects, pollinators, plants, mammals; (ii) **less environmental persistence**; (iii) reduce dependence on toxic chemicals that pollute soil/groundwater/food. Core principle of organic farming and IPM.
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