Wyoming Pesticide Applicator Certification Practice Test

What is the No Observable Effect Level (NOEL) of a pesticide?

1. The maximum dose or exposure level that produces toxic effects on test animals.

2. The level at which all pests are eliminated.

3. The level that does not remain active in the environment.

4. The level that produces no observable toxic effect on test animals.

The correct answer is: The level that produces no observable toxic effect on test animals.

The No Observable Effect Level (NOEL) of a pesticide refers to the level at which the pesticide produces no observable toxic effects on test animals. This means that at the NOEL, there are no visible signs of harm or negative impact on the animals being tested. It is an important parameter in determining safe exposure levels for both humans and the environment when using pesticides. Option A is incorrect because it describes the maximum dose or exposure level that produces toxic effects on test animals, which is not the definition of NOEL. Option B is incorrect because it states the level at which all pests are eliminated, which is not the definition of NOEL. Option C is incorrect because it mentions the level that does not remain active in the environment, which is not the definition of NOEL.