Stimulus Response in Humans and Plants

Define homeostasis.

• When the inside of an organism is balanced.

• When the inside of an organism is not balanced.

• None of the above.

• Maintaining a balance outside the body of an organism.

Answer explanation

The correct definition of homeostasis is when the inside of an organism is balanced.

Check all that apply. Which of the following are examples of an organism trying to maintaining homeostasis?

• Shivering when cold

• Sweating when hot

• Fever - an immune response when sick

• Vomiting - releases toxins and wastes

Answer explanation

Vomiting releases toxins and wastes, fever is an immune response, sweating cools the body, and shivering generates heat - all examples of maintaining homeostasis.

A stimulus is....

• Change in an organism’s environment that causes it to react.

• How the organism reacts to the stimulus.

Answer explanation

A stimulus is a change in an organism’s environment that causes it to react, making the correct choice 'Change in an organism’s environment that causes it to react.'

A response is....

• Change in an organism’s environment that causes it to react.

• How the organism reacts to the stimulus.

Answer explanation

The correct answer is how the organism reacts to the stimulus, as a response refers to the reaction of an organism to a stimulus in its environment.

What are the two types of stimuli?

• External and internal stimuli

• External and intermediate stimuli

• Internal and extraterrestrial stimuli

Answer explanation

The correct types of stimuli are external and internal, not intermediate or extraterrestrial stimuli.

External stimuli is....

• stimuli happening outside of the organism.

• stimuli happening inside the organism.

Answer explanation

External stimuli refer to stimuli happening outside of the organism, not inside. Therefore, the correct choice is stimuli happening outside of the organism.

Internal stimuli is...

• stimuli happening outside of the organism.

• stimuli happening inside the organism.

Answer explanation

Internal stimuli refer to stimuli happening inside the organism, such as thoughts, emotions, or physiological processes.

The presence of food causes the dog to drool. What kind of stimuli is the food?

• External

• Internal

Answer explanation

The correct choice is 'External' because food is an external stimulus that triggers the dog's drooling response.

The weather temperature is cold outside and you start to shiver. Which part is the stimulus?

• weather temperature

• shivering

Answer explanation

The correct choice is 'weather temperature' because it is the stimulus that causes the shivering reaction.

Weather temperature is an example of what kind of stimuli?

• External stimuli

• Internal stimuli

Answer explanation

Weather temperature is an example of external stimuli because it originates from outside the body and affects an organism's behavior or physiology.