Question 1

Parasitic fungi will usually attack a plant through stomata on the root surface.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following chemicals is a signal that induces systemic acquired resistance?

Accepted Answer

A)  salicylic acid
B)  brassinosteroids
C)  systemin
D)  avrE) B) and C)
F) A) and D)

Question 3

Tannins are chemicals that help plants repel invaders by

Accepted Answer

A)  over-stimulating the predator.
B)  sedating the predator.
C)  binding to proteins and thereby disrupting the predator's digestion.
D)  injuring the external covering of the predator's body.E) All of the above
F) B) and D)

Question 4

Which category of plant second metabolites includes stimulants like caffeine, nicotine, and cocaine?

Accepted Answer

A)  tannins
B)  alkaloids
C)  phenolics
D)  cyanogenic glycosidesE) C) and D)
F) B) and C)

Question 5

Phytoestrogens are steroid-like chemicals that are derived from soy.One of their characteristics is that they are able to

Accepted Answer

A)  paralyze nerve endings.
B)  bind to the human estrogen receptor.
C)  cause estrogen breakdown within human cells.
D)  increase the rate of prostate cancer in men.E) B) and D)
F) None of the above

Question 6

Evidence that black walnut trees exhibit allelopathy includes

Accepted Answer

A)  the lack of vegetation growing under black walnut trees.
B)  the death of hornworms that try to eat black walnut leaves.
C)  the symbiotic relationship the trees have with fungi.
D)  the ants that protect the trees from herbivory.E) C) and D)
F) A) and B)

Question 7

Which common crop may contain traces of hormone-like substances that may affect human health?

Accepted Answer

A)  corn
B)  wheat
C)  peanuts
D)  soybeanE) B) and C)
F) A) and D)

Question 8

Taxol, a secondary metabolite from the bark of the Pacific yew tree, is used as a treatment for

Accepted Answer

A)  diabetes.
B)  breast cancer.
C)  indigestion.
D)  headaches.E) None of the above
F) A) and B)

Question 9

Systemin can correctly be described as a(n)

Accepted Answer

A)  peptide.
B)  apoplast.
C)  receptor.
D)  leaf lipid.E) All of the above
F) C) and D)

Question 10

How does systemin cause the activation of the wound response in tomato plants?

Accepted Answer

A)  It binds directly to jasmonic acid.
B)  It directly signals gene expression.
C)  It induces the production of tannins.
D)  It induces a jasmonic acid signaling pathway in certain cells.E) B) and D)
F) None of the above

Question 11

Nonnative plant invaders, such as the alfalfa plant bug, are extremely invasive and hard to control because

Accepted Answer

A)  they arrive in new locations where natural predators are not present.
B)  they tap into the xylem of a plant while seeking carbohydrates.
C)  they cause the plants' axillary buds to grow out.
D)  their populations evolve faster than the plants they attack.E) A) and D)
F) A) and B)

Question 12

Systemic acquired resistance is

Accepted Answer

A)  a broad-ranging resistance that lasts for a period of days.
B)  the same as the human immune response.
C)  a response whereby antibodies recognize specific antigens.
D)  a response that occurs when the hypersensitive response fails.E) A) and B)
F) A) and C)

Question 13

Cyanogenic glycosides, which break down into cyanide, are toxic to cells because they inhibit the function of which organelle(s) ?

Accepted Answer

A)  Golgi apparatus
B)  Ribosome
C)  Nucleolus
D)  MitochondriaE) A) and D)
F) A) and B)

Question 14

Systemic response occurs when plants exhibit generalized defense responses in organs distant from the wound.

Accepted Answer

A) True 
 B)False

Question 15

Many plants are filled with toxins that kill or deter herbivores.Many plants sequester these compounds within the cell.Where in the plant cell are these toxic substances most likely stored?

Accepted Answer

A)  Central vacuole
B)  Mitochondria
C)  The stroma
D)  AmyloplastsE) C) and D)
F) B) and C)

Question 16

Which of the following methods do fungi use in order to penetrate the initial layer of a plant's defenses?

Accepted Answer

A)  mechanical bridging
B)  sharp mouthparts
C)  entry through stomates
D)  secretion of phospholipids to dissolve the cuticle The phases of fungal infection are discussed in Section 39.1.E) A) and B)
F) A) and C)

Exam 39: Plant Defense Responses

Which of the following chemicals is a signal that induces systemic acquired resistance?

Correct Answer
verified

Parasitic fungi will usually attack a plant through stomata on the root surface.

Correct Answer
verified

Evidence that black walnut trees exhibit allelopathy includes

Correct Answer
verified

Nonnative plant invaders, such as the alfalfa plant bug, are extremely invasive and hard to control because

Correct Answer
verified

How does systemin cause the activation of the wound response in tomato plants?

Correct Answer
verified

Phytoestrogens are steroid-like chemicals that are derived from soy.One of their characteristics is that they are able to

Correct Answer
verified

Many plants are filled with toxins that kill or deter herbivores.Many plants sequester these compounds within the cell.Where in the plant cell are these toxic substances most likely stored?

Correct Answer
verified

Tannins are chemicals that help plants repel invaders by

Correct Answer
verified

Cyanogenic glycosides, which break down into cyanide, are toxic to cells because they inhibit the function of which organelle(s) ?

Correct Answer
verified

Systemic acquired resistance is

Correct Answer
verified

Which category of plant second metabolites includes stimulants like caffeine, nicotine, and cocaine?

Correct Answer
verified

Taxol, a secondary metabolite from the bark of the Pacific yew tree, is used as a treatment for

Correct Answer
verified

Systemic response occurs when plants exhibit generalized defense responses in organs distant from the wound.

Correct Answer
verified

Which common crop may contain traces of hormone-like substances that may affect human health?

Correct Answer
verified

Systemin can correctly be described as a(n)

Correct Answer
verified

Which of the following methods do fungi use in order to penetrate the initial layer of a plant's defenses?

Correct Answer
verified

Exam 39: Plant Defense Responses

Which of the following chemicals is a signal that induces systemic acquired resistance?

Correct AnswerverifiedShow Answer

Parasitic fungi will usually attack a plant through stomata on the root surface.

Correct AnswerverifiedShow Answer

Evidence that black walnut trees exhibit allelopathy includes

Correct AnswerverifiedShow Answer

Nonnative plant invaders, such as the alfalfa plant bug, are extremely invasive and hard to control because

Correct AnswerverifiedShow Answer

How does systemin cause the activation of the wound response in tomato plants?

Correct AnswerverifiedShow Answer

Phytoestrogens are steroid-like chemicals that are derived from soy.One of their characteristics is that they are able to

Correct AnswerverifiedShow Answer

Many plants are filled with toxins that kill or deter herbivores.Many plants sequester these compounds within the cell.Where in the plant cell are these toxic substances most likely stored?

Correct AnswerverifiedShow Answer

Tannins are chemicals that help plants repel invaders by

Correct AnswerverifiedShow Answer

Cyanogenic glycosides, which break down into cyanide, are toxic to cells because they inhibit the function of which organelle(s) ?

Correct AnswerverifiedShow Answer

Systemic acquired resistance is

Correct AnswerverifiedShow Answer

Which category of plant second metabolites includes stimulants like caffeine, nicotine, and cocaine?

Correct AnswerverifiedShow Answer

Taxol, a secondary metabolite from the bark of the Pacific yew tree, is used as a treatment for

Correct AnswerverifiedShow Answer

Systemic response occurs when plants exhibit generalized defense responses in organs distant from the wound.

Correct AnswerverifiedShow Answer

Which common crop may contain traces of hormone-like substances that may affect human health?

Correct AnswerverifiedShow Answer

Systemin can correctly be described as a(n)

Correct AnswerverifiedShow Answer

Which of the following methods do fungi use in order to penetrate the initial layer of a plant's defenses?

Correct AnswerverifiedShow Answer

Correct Answer
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