Site MapHelpFeedbackChapter Quiz
Chapter Quiz
(See related pages)



1

True or false. Hormones regulate only a limited number of aspects of plant growth, and a single hormone elicits only one type of response.
A)True
B)False
2

What is the specific action of auxin?
A)triggers seed germination by initiating water uptake
B)initiates leaf and fruit abscission
C)causes membrane proteins to pump protons into the cell wall that, in turn, activate enzymes
D)All of these are correct.
3

Which of the following chemicals are herbicides?
A)indoleacetic acid
B)2, 4 ~ dichlorophenoxyacetic acid
C)ethylene
D)a and b
4

What action cannot be attributed to gibberellin?
A)stimulates shoot elongation
B)stimulates seed germination
C)hastens fruit ripening
D)All of these are actions of gibberellin.
5

What class of hormone is responsible for cell division in young leaves?
A)auxins
B)gibberellins
C)cytokinins
D)ethylene
6

Apical dominance involves ____________ more concentrated in roots and ___________ more concentrated in shoot tips.
A)auxins, cytokinins
B)cytokinins, auxins
C)gibberellins, auxins
D)cytokinins, gibberellins
7

What hormone is responsible for the ripening of fruit?
A)abscisic acid
B)gibberellins
C)cytokinins
D)ethylene
8

What hormone inhibits the growth-stimulating effects of the auxins?
A)abscisic acid
B)gibberellins
C)cytokinins
D)ethylene
9

What pigment is the photoreceptor responsible for phototropism?
A)chlorophyll a
B)chlorophyll b
C)xanthophyll
D)flavin
10

What hormone(s) is/are responsible for thigmotropism?
A)auxin
B)cytokinin
C)ethylene
D)both a and b
E)both a and c
11

True or false. Thigmonastic movements can be protective.
A)True
B)False
12

Thigmonastic movements result from ______________.
A)reversible changes in turgor pressure
B)increased cell size through acidification
C)Both a and b are correct.
D)None of these is correct.
13

When a prayer plant changes the orientation of its leaves it is said to be _____________.
A)thigmotropic
B)phototropic
C)thigmonastic
D)nyctinastic
14

What type of plants flower regardless of length of day?
A)long-day plants
B)day-neutral plants
C)short-day plants
D)intermediate-day plants
15

What pigment is responsible for photoperiodism?
A)cytochrome
B)phytochrome
C)carotenoid
D)chlorophyll
16

___________ is the rapid elongation of pale, spindly seedlings with tiny leaves.
A)Senescence
B)Dormancy
C)Etiolation
D)Germination
17

True or false. Only a changing photoperiod can trigger dormancy.
A)True
B)False
18

Environmentally controlled resynchronization of a circadian rhythm is called ______________.
A)entrainment
B)synchrony
C)heliotropism
D)photoperiodism
19

True or false. Heliotropic plants maximize sun exposure to warm pollinators as well as for photosynthesis.
A)True
B)False
20

What plant communication molecule(s) help(s) regulate development by inactivating certain genes?
A)salicylic acid
B)methyl groups
C)jasmonic acid
D)brassinolide





To learn more about the book this website supports, please visit its Information Center.
(c)2004 McGraw-Hill Higher Education
Any use is subject to the Terms of Use and Privacy Policy.
McGraw-Hill Higher Education is one of the many fine businesses of The McGraw-Hill Companies.


Life, 5/eOnline Learning Center with Powerweb

Home > Chapter 29 > Multiple Choice Quiz