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 38.2, Problem 2R
Summary Introduction
To review:
The defenses, which work together, to protect tobacco plant from herbivores.
Introduction:
Plants have various defenses against herbivores. These defenses can be both chemical and mechanical. The chemical defenses used by the plants are usually using a range of chemical substances called secondary metabolites. These metabolites are not used in basic cellular functioning. Rather, they have a protective role. Plants have also evolved induced defenses in case they are attacked by pathogens. Tobacco plants produce a substance known as nicotine which is a secondary metabolite. They also have other induced defenses, which protect the plant against herbivores.
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Tobacco leaves contain nicotine, a poisonous compoundthat is energetically expensive for the plant to make.What advantage might the plant gain by using some ofits resources to produce nicotine?
Plant-to-plant signalling in response to herbivory is mediated by
Select one:
a)lignin deposition
b)abscisic acid
c)the anti-malarial molecule artemisin
d)volatile organic compounds
Comparison between plants and humans defenses in DEFENSE MECHANISMS s
Chapter 38 Solutions
Life: The Science of Biology
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- Which of the following is an effective plant defense against insect herbivory? Select one: a. Hypersensitive response b. Gene-for-gene resistance c. Salicylic acid d. Protease inhibitors e. Resistance genesarrow_forwardIn response to plant pathogens, plants will ______ hypersensitivity response and ____ salicyclic acid levels. Select one: a. suppress, increase b. suppress, decrease c. promote, decrease d. promote, increasearrow_forwardWhich of the following is most likely NOT an example of a plant defense to herbivory? Lignin in the tissues Urushiol production (e.g. in poison ivy) Coconut huskarrow_forward
- Why are some plants called C4 plants and why are they important? How have they adapted to unfavorable climatic conditions? How do the activities of C4 plants compare with the activities of CAM plants?arrow_forwardPlants have systemic defense mechanisms ( those that are not normally active but can be induced when the plant is under attack) describe an example of one systemic defense, including the processes, structures and/or molecules involved.arrow_forwardfill in the blanks In signal transduction, termination of the active Gas is by ( ) and termination of the cAMP signal is by ( ).arrow_forward
- Production of _____ would directly prevent herbivory. Select one: a. aerenchyma b. glutathione c. jasmonic acid d. nicotine e. carotenoidsarrow_forwardMoths resting on the trunks of trees often resemble the tree bark such that potential predators do not perceive them as prey. This is an example of: an induced defense. aposematic coloration. crypsis. silencing.arrow_forwardChewing insects mechanically damage plants and lessen the surface area of leaves for photosynthesis. In addition, these insects make plants more vulnerable to pathogen attack. Suggest a reason why.arrow_forward
- Epidermal growth factor, Platelet derived growth factor and nerve growth factor are all examples of what type of signaling molecule? a)local mediator b)hormone c)neurotransmitter d)All of the other answers are correct e)contact dependent signaling molecule.arrow_forwardThis mule deer is grazing on the shoot tips ofa shrub. Describe howthis event will alter thephysiology, biochemistry, structure, andhealth of the plant,and identify whichhormones and otherchemicals are involvedin making thesechangesarrow_forwardWhy is it advantageous for a plant toxin to elicit a bitter tastewhen an animal eats the plant rather than a bland or sweettaste?arrow_forward
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