Question

which of the following gives the best definition for response to a stimulus? 1. a reaction or change in behaviour to a change in the environment. 2. when an organism responds to a change in the environment without conscious thought. 3. a term used to describe the bodys natural defence mechanism against infectious diseases. 4. a change in the environment as a result of a change in behaviour.

Explanation:

A response to a stimulus is defined as a reaction or change in behavior to a change in the environment. Option 1 correctly captures this concept. Option 2 describes an instinctive - like response without conscious thought which is more related to reflexes. Option 3 is about the body's defense mechanism against infections (immune - related). Option 4 is about a change in the environment due to a change in behavior which is the reverse of what a response to a stimulus is.

Answer:

1. A reaction or change in behaviour to a change in the environment.