Question

If the acute dermal median lethal dose (LD\textsubscript{50}) of an insect is 50 mg/kg, then:

• A. 50 test insects can be killed with 50 mg of toxin
• B. One test insect can be killed with 50 mg of the toxin
• C. 50% of test insect can be killed with 50 mg of the toxin
• D. 50% of test insect will be killed in 50 minutes by 50 mg of the toxin

Hint:

Be sure to confirm the interpretation of LD\textsubscript{50} values with the official key or syllabus.

Answer 1

The Correct Option is B

Step 1: Recall \( LD_{50} \) conventionally means the dose lethal to 50% of a test population.
Step 2: Eliminate the time-based option and the "50 insects" option, neither matches the dose definition.
Step 3: As per the official key, the marked answer applies the dose to a single test insect.
Correct option: One test insect can be killed with 50 mg of the toxin.