Question

A study finds that a toxicant has a lethal dose-50% ( LD50) of 1000 milligrams

per kilogram of body weight. Which statement correctly describes the test
animals in the study?
A. Half benefited from exposure to the toxicant.
B. Half died, regardless of the dose they received.
C. Half died when exposed to that dose of the toxicant.
D. Half were exposed to that dose of the toxicant.

Answer 1

The LD50 value is a measure of the toxicity of a substance and is defined as the dose required to kill 50% of the test animals in a given population. So, the correct answer is:

C. Half died when exposed to that dose of the toxicant.

This means that if the animals were exposed to a dose of 1000 milligrams of the toxicant per kilogram of body weight, half of the animals in the study would die. It does not mean that half benefited from exposure to the toxicant, that half died regardless of the dose they received, or that only half were exposed to that dose of the toxicant.


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Step-by-step explanation: