LD50 tells you:

• A. The toxicity of the pesticide
• B. The maximum residue limit in food
• C. The mode of action
• D. The toxicity of the pesticide AND HOW MUCH ACTIVE INGREDIENT IT TAKES TO KILL 50% OF LAB ANIMALS TREATED

Answer: (D)

LD50 is the lethal dose for 50% of a defined test population, a measure of a substance’s potency. It tells you how toxic the pesticide is by showing the amount of active ingredient needed to cause death in half of the test animals under standardized conditions, typically expressed as mg per kg of body weight. A smaller LD50 means higher toxicity because only a small amount is required to reach the lethal threshold; a larger LD50 means lower toxicity. This value is specific to factors like species, route of exposure, and testing conditions, and it does not indicate residue limits in food or the chemical’s exact mode of action. So the LD50 best describes both the toxicity and the amount of active ingredient needed to kill 50% of the treated animals.