Which of the following is true for inorganic insecticides?

The statement regarding borates being an example of inorganic insecticides used for wood infestations is true. Borates are naturally occurring minerals that serve as effective insecticides and fungicides. They are particularly useful for treating wood because they penetrate deeply into wood fibers, preventing attacks from wood-destroying insects, such as termites and carpenter ants. This quality makes borates a preferred choice in pest control for wood preservation.

Inorganic insecticides tend to have specific applications based on their chemical composition and mode of action, which differentiates them from other types of pesticides. While they can be effective for certain pest problems, the claim that they are derived from synthetic chemicals is not applicable to all inorganic insecticides, as some are derived from naturally occurring minerals. Similarly, while some inorganic insecticides may be used in agricultural settings, they have varied applications beyond agriculture, which makes other options less accurate. The lesser toxicity to humans can vary based on the specific chemical and its application method, making it not universally applicable as a true characteristic of inorganic insecticides.