Podcast
Questions and Answers
What is a stimulus?
What is a stimulus?
- A type of cellular growth
- A change detectable by a living thing (correct)
- An energy source for organisms
- A response to environmental changes
Which of the following is not a characteristic of a living thing?
Which of the following is not a characteristic of a living thing?
- Inability to respond to stimuli (correct)
- Usage of energy
- Regulation of internal conditions
- Ability to grow
How do bacteria sense stimuli?
How do bacteria sense stimuli?
- Using specialized organs
- With the help of external devices
- By means of receptors (correct)
- Through their eyes and ears
What is an example of an internal stimulus?
What is an example of an internal stimulus?
How might an organism respond to a beneficial stimulus?
How might an organism respond to a beneficial stimulus?
What is a typical response of an opossum when faced with a scary predator?
What is a typical response of an opossum when faced with a scary predator?
How does a single-celled bacterium react to a dangerous chemical?
How does a single-celled bacterium react to a dangerous chemical?
What is an example of a human response to a bad stimulus?
What is an example of a human response to a bad stimulus?
What behavior does a wolf exhibit in response to the positive stimulus of a deer's scent?
What behavior does a wolf exhibit in response to the positive stimulus of a deer's scent?
What do yeast cells do when mixed with sugar?
What do yeast cells do when mixed with sugar?
Flashcards
What is a stimulus?
What is a stimulus?
A change that a living thing can detect.
Which of the following is not a characteristic of a living thing?
Which of the following is not a characteristic of a living thing?
All living things respond to stimuli.
How do bacteria sense stimuli?
How do bacteria sense stimuli?
Special structures that allow organisms to sense changes in their environment.
What is an example of an internal stimulus?
What is an example of an internal stimulus?
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How might an organism respond to a beneficial stimulus?
How might an organism respond to a beneficial stimulus?
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What is a typical response of an opossum when faced with a scary predator?
What is a typical response of an opossum when faced with a scary predator?
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How does a single-celled bacterium react to a dangerous chemical?
How does a single-celled bacterium react to a dangerous chemical?
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What is an example of a human response to a bad stimulus?
What is an example of a human response to a bad stimulus?
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What behavior does a wolf exhibit in response to the positive stimulus of a deer's scent?
What behavior does a wolf exhibit in response to the positive stimulus of a deer's scent?
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What do yeast cells do when mixed with sugar?
What do yeast cells do when mixed with sugar?
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Study Notes
Characteristics of Living Things
- A living thing is composed of cells, grows, uses energy, regulates internal conditions, and responds to stimuli.
- Responding to stimuli is a key characteristic of living things.
Stimulus
- A stimulus is a change that can be detected by a living thing.
- Stimuli can be external (coming from the environment) or internal (happening within the organism).
- External stimuli can be detected through senses (sight, sound, touch, taste, smell).
- Internal stimuli include changes within the body, such as hunger and thirst.
Recognition and Response to Stimuli
- Living things can respond to stimuli by modifying their behavior.
- Stimuli can be good or bad, and the response will aim to increase or decrease the stimulus accordingly.
- Good stimuli are wanted, and the organism will behave in a way to increase it.
- Bad stimuli are unwanted, and the organism will behave in a way to decrease it.
Examples of Response to Stimuli
Bad Stimuli
- Opossums respond to scary stimuli by "playing dead" to avoid predators.
- Bacteria can respond to negative stimuli by changing direction to avoid danger.
- Humans respond to bad stimuli, such as sour taste, by changing their behavior to remove the stimulus.
Good Stimuli
- Wolves respond to positive stimuli, such as a deer's scent, by following it to find prey.
- Humans respond to positive stimuli, such as liking a pair of shoes, by increasing their interaction with it.
- Yeast cells respond to positive stimuli, such as sugar, by increasing their activity and performing fermentation.
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