Ch. 40 Questions

Question 1

If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants’ environment?

a. carbon dioxide
b. gibberellic acids
c. cytokinins
d. auxin
e. ethylene

Answer 1

e. ethylene

Question 2

Which of the following can function in signal transduction in plants?

• calcium ions
• nonrandom mutations
• receptor proteins
• autochrome
• secondary messengers

Answer 2

• calcium ions
• receptor proteins
• secondary messengers

Question 3

Which of the following is the most likely plant response to an attack by herbivores?

a. production of chemical compounds for defense or to attract predators
b. leaf abscission to prevent further loss of tissue
c. production of thicker bark & cuticle to make it more difficult to eat
d. production of physical defense, such as thorns
e. early flowering to reproduce before being eaten

Answer 3

a. production of chemical compounds for defense or to attract predators

Question 4

The aleurone layer is stimulated to release ______ as a result of gibberellin release from the embryo.

a. amylase
b. RNAase
c. cytokinins
d. carbohydrates
e. amino acids

Answer 4

a. amylase

Question 5

Which of the following is the strongest evidence that cytokinins regulate cell divisions? There is ____.

a. a decrease of cyclin gene expression in tissues exposed to cytokynin
b. an increase of cyclin gene expression in tissues exposed to cytokinin
c. an induction of root growths in tissues exposed to cytokinin
d. an induction of shoot growths in tissues exposed to cytokinin
e. an ability of cytokinin to interact with auxin at the molecular level & change auxin biosynthesis & transport

Answer 5

b. an increase of cyclin gene expression in tissues exposed to cytokinin

Question 6

A researcher found a beautiful plant while traveling in Alaska and collected its seeds. When she came back to Florida, she soaked some seeds in pure water and some in water with a hormone. When she put the seeds in soil to grow, only the seeds that had been soaked with the hormone germinated. The hormone most likely was ____.

a. gibberellin
b. ethylene
c. abscisic acid (ABA)
d. auxin

Answer 6

a. gibberellin

Question 7

You are part of a desert plant research team trying to discover crops that will be productive in arid climates. You discover a plant that, under water-deficit conditions, produces a hormone that triggers a suite of drought responses. Most likely the hormone is _____.

a. gibberellin or gibberellic acid
b. 2,4-D
c. abscisic acid (ABA)
d. indoleacetic acid
e. salicylic acid

Answer 7

c. abscisic acid (ABA)

Question 8

Which of the following can be sensed by plants?

a. gravity
b. pathogens
c. wind
d. light
e. all of the above

Answer 8

e. all of the above

Question 9

If cells in the _______ are removed, roots will no longer respond to gravity.

a. root hairs
b. zone of elongation
c. secondary meristem
d. root cap

Answer 9

d. root cap

Question 10

Auxins in plants are known to affect which of the following processes?

• gravitropism of shoots
• maintenance of seed dormancy
• phototropism of shoots
• inhibition of lateral buds
• apical dominance

Answer 10

• gravitropism of shoots
• phototropism of shoots
• apical dominance