Concepts | Questions | Media Resources |
27.1 Plant responses
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- Like animals, plants use a reception-transduction-response pathway when they respond to a stimulus.
- Tropisms are growth responses in plants toward or away from unidirectional stimuli such as light and gravity.
- Plants sometimes exhibit circadian rhythms (e.g., closing of stomata) that recur approximately every 24 hours.
| - What is tropism and what does it mean to have a positive or negative tropism?
Answer - How does a stem bend in response to light?
Answer - How does auxin cause a root to bend in response to gravity?
Answer - What are nastic movements and provide an example?
Answer - What is a biological clock?
Answer
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Essential Study Partner
Summaries of major points- Organisms respond to stimuli
- Tropisms
- Phototropism
- Gravitropism
- Thigmotropism
- Nastic movements
- Sleep movements
Art Review
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27.2 Plant hormones
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- Some plant hormones stimulate growth, and other plant hormones inhibit growth.
- The biochemical manner in which auxin and gibberellin function has been studied.
- It now appears that various plant hormones interact to bring about a response to a stimulus.
| - What is apical dominance and how is it controlled by the hormone auxin?
Answer - What are the primary functions of gibberellins?
Answer - What hormone promotes cell division in plants?
Answer - What is senescence and what hormone can prevent it?
Answer - What are the major functions of abscisic acid and ethylene?
Answer
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Essential Study Partner
Summaries of major points- For plants to respond to stimuli....
- Auxin
- How auxins work
- Gibberellins
- Cytokinins
- Senescence
- Inhibitory hormones
- Ethylene
Art Review
Art Quizzes
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27.3 Photoperiodism
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- Plant responses that are controlled by the length of daylight (photoperiod) involve the pigment phytochrome.
| - The physiological response of a plant to changes in day length is called _____________.
Answer - What is the pigment which allows plants to determine day length and how does it function?
Answer - What are some other known functions of phytochrome?
Answer
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Essential Study Partner
Summaries of major points- Many physiological changes in plants are related to a seasonal change in day length
- Plants can be divided into three groups
- A long-day and a short-day plant can have same critical length
- Phytochrome and flowering
- Other functions of phytochrome
Art Review
Art Quizzes
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