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Evaluation of LD50 (lethal dose for 50% of test organisms) and LC50 (lethal concentration for 50% of test organisms) is crucial in insect physiology and toxicology because these parameters provide a quantitative measure of the toxicity of pesticides. LD50 indicates the dose required to kill half of a population when a pesticide is administered through direct contact or ingestion, while LC50 reflects the _______ ________ ___ __________ _________ ____ _______ _________ __________ ____ ___.
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