Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 36.3, Problem 1R
Summary Introduction
To review:
The auxin to cytokinin ratio of a plant with a bushy type of growth habit.
Introduction:
Hormones of the plant essentially act as signaling molecules that regulate growth and control a lot of physiological functions of the plant. They are only required in small quantities. Different plant hormones are required for different processes. For example, ethylene promotes fruit ripening and abscisic acid stimulates seed dormancy.
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The summer is not optimal for grape growing and you're searching in your memory for something regarding plant hormones.
Explain 2 ways you could utilize plant hormones (choose from auxin, ethylene, cytokinin, gibberellin, abscisic acid, salicylic acid, jasonic acid) to compensate for a problem during growing. For each way:
What is the gravity receptor involved in gravitropism?
Plant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs.
(b) Explain the role that auxin has in eliciting the plant’s response.
Chapter 36 Solutions
Life: The Science of Biology
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- What do you mean by auxin?arrow_forwardWhat are the effects brought by cytokinin in plants? Explain the partnerships between cytokinin with auxin and hormone mentioned in Question 3 a). (i) (ii) Write an account on interactions between gibberellins, indole acetic acid and abscisic acid in plant growth promotion and seed germination.arrow_forwardExplain the signaling mechanism associated with auxin actionarrow_forward
- How does the signal transduction pathway for auxin that leads to cell wall loosening. Include the receptors ABP and ARF. How does the auxin pathway possibly differ from the 'generic' signal transduction pathway? Consider expressing the cellular components that differ in the absence and presence of auxin.arrow_forwardGreenhouse-grown tomato seedlings are often brushed by hand to simulate wind. This causes seedlings to grow slower, thicken stems, & resist mechanical wind damage when planted in the field. Which hormone is responsible? Auxin Salicylic acid Gibberellin Abscisic acid cytokinin Ethylenearrow_forwardPlant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs. a) Describe the plant’s response to the presence of light. (refer to picture)arrow_forward
- Spraying a plant with which of the following will increase axillary bud growth? Strigolactone Ethylene Cytokinin Auxinarrow_forwardWhich of these is caused by the effects of auxin? (choose all that apply) 1.Maintaining apical dominance 2.suppressing lateral bud growth 3. stimulating root growth in stem leaf buds 4.stimulating root elongation 5. preventing seed germination 6.phototropismarrow_forwardDescribe the unique way that auxin can move through a plant.arrow_forward
- This is a picture of the initial experiments to figure out how auxin and phototropism worked. How do you expect the plant will grow in each scenario and why?arrow_forwardIf auxin transport proteins were equally distributed at both ends of the cells, would polar auxin transport still be possible? Explain.arrow_forwardCertain mutations in thale cress cause excess auxin production. What are the impact of these mutations on the plants’ phenotype.arrow_forward
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