Final answer:
The LD50 of a pesticide is an indication of how much active ingredient it takes to kill at least 50% of the laboratory animals treated. It is a standardized measure for expressing and comparing the toxicity of chemicals.
Step-by-step explanation:
The LD50 of a pesticide is an indication of how much, active ingredient it takes to kill at least 50% of the laboratory animals treated. The LD50 is a standardized measure for expressing and comparing the toxicity of chemicals. It is typically determined experimentally using animal models.