Stimulus and Response Worksheet
Explore the concepts of stimulus and response in living organisms with this Grade 7 Science worksheet.
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Stimulus and Response in Living Organisms
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Read each question carefully and answer to the best of your ability. This worksheet will test your understanding of how living organisms respond to stimuli in their environment.
1. What is a stimulus?
A change in an organism's internal environment only
A change in an organism's external environment only
Any detectable change in the internal or external environment that causes a reaction
The way an organism reacts to a change
2. Which of the following is an example of an external stimulus?
Feeling hungry
A loud noise
Low blood sugar
Feeling tired
3. The nervous system helps organisms to detect and produce appropriate .
4. When you touch a hot stove, your hand quickly pulls away. The hot stove is the , and pulling your hand away is the .
5. Describe the role of the five senses in detecting stimuli from the environment.
6. Observe the diagram of the human nervous system below. Identify two parts of the nervous system and explain their function in stimulus and response.
Part 1:
Function:
Part 2:
Function:
7. Plants do not respond to stimuli because they cannot move.
True
False
8. A reflex action is an involuntary response to a stimulus.
True
False
Match each term with its correct definition.
9. Phototropism
a. The reaction of an organism to a stimulus
10. Response
b. Growth of a plant towards light
11. Homeostasis
c. The maintenance of stable internal conditions in a living organism
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