Stimulus and Response in Organisms
Explore the concepts of stimulus and response, how organisms react to their environment, and the role of the nervous system.
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Stimulus and Response in Organisms
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Read each question carefully and answer to the best of your ability. For multiple choice questions, circle the correct option. For fill-in-the-blank questions, complete the sentence with the appropriate term. For short answer questions, write your response on the lines provided.
1. What is a stimulus?
An organism's reaction to its environment
A change in the environment that causes a response
The process of maintaining a stable internal environment
The ability of an organism to move
2. Which of the following is an example of an external stimulus?
Feeling hungry
A sudden loud noise
Low blood sugar
Feeling tired
3. The nervous system is responsible for detecting and coordinating in animals.
4. Plants respond to light through a process called .
5. A reflex is an and rapid response to a stimulus.
6. Describe the difference between a positive and negative tropism in plants. Provide an example for each.
7. Explain how the human body maintains a stable internal temperature in response to cold weather.
8. Label the main parts of the human nervous system shown in the diagram below.
9. All responses to stimuli are conscious actions.
True
False
10. Hormones play a role in plant responses to stimuli.
True
False
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