Systemic insecticides________________?
Correct answer: D. Are absorbed throughout the plant
- A. Emit poisonous vapour
- B. Kill insects following external bodily contact
- C. Are stomach poisons
- D. Are absorbed throughout the plant
Explanation
Systemic insecticides are taken up by a plant and transported through its tissues, so insects feeding on or contacting the treated plant are poisoned. External-contact poisons and stomach poisons are separate insecticide categories.
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