AP Environmental Science / Unit 8: Aquatic and Terrestrial Pollution

8.12 Lethal Dose 50% (LD50)

3 practice questions

Notes

$\mathrm{LD_{50}}$ is the dose that kills 50% of a test population. A lower $\mathrm{LD_{50}}$ means a more toxic substance. Usually given in mg per kg of body mass.

Practice

Substance A: $\mathrm{LD_{50}}$ = 5 mg/kg. Substance B: 500 mg/kg. Which is more toxic?

$\mathrm{LD_{50}}$ is measured in:

A 70 kg person and a substance with $\mathrm{LD_{50}}$ of 10 mg/kg. The dose for 50% lethality:

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