What type of insecticide is Lindane classified as?

• A. Nonsystemic insecticide
• B. Systemic insecticide
• C. Selective herbicide
• D. Contact insecticide

Answer: (A)

Lindane is classified as a nonsystemic insecticide, which means that it acts primarily on contact rather than being absorbed and transported throughout the plant. Nonsystemic insecticides are effective by coming into direct contact with pests, allowing the active ingredient to disrupt nervous system function upon direct exposure. This type of action is particularly useful in controlling surface-dwelling insects, as the insecticide does not enter the plant tissue extensively but targets pests that contact the treated surfaces.

In contrast, systemic insecticides are absorbed by the plant and can move within its tissues, providing protection from pests that feed on the plant. Selective herbicides target specific plant types while sparing others and are not designed to affect insects. Contact insecticides primarily focus on immediate exposure rather than lethal effects that occur through ingestion or absorption, but it's essential to note that Lindane's effectiveness relies largely on direct contact with the insect, aligning it with the characteristics of nonsystemic insecticides.