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Introductory Plant Biology, 9/e
Kingsley R. Stern, California State University, Chico
Growth

Chapter Quiz



1

Frits Went discovered that auxins occur in the tip of coleoptiles, and were responsible for causing them to bend toward the light.
A)True
B)False
2

There are only three known gibberellins that occur naturally in plants.
A)True
B)False
3

Cytokinins can be used to stimulate the growth of axillary buds.
A)True
B)False
4

Abscisic acid promotes the formation of the abscission layer.
A)True
B)False
5

Gravitropism is a plant's response to contact with a solid object.
A)True
B)False
6

The folding of leaflets in the sensitive plant in response to touch is an example of thigmotropism.
A)True
B)False
7

Plants that need a day length shorter than twelve hours are called day-neutral plants.
A)True
B)False
8

Which of the following substances is produced in actively growing regions of the plant, and transported to other areas where they have a specific effect?
A)enzyme
B)nutrients
C)vitamins
D)hormones
9

Which of the following substances stimulates the enlargement of cells?
A)agar
B)auxin
C)abscisic acid
D)ethylene
10

Which hormone is used commercially on stem cuttings to stimulate root growth?
A)2,4,5-T
B)IAA
C)GA
D)ethylene
11

Which hormone is known to stimulate cell division?
A)cytokinin
B)abscisic acid
C)phytochrome
D)florigen
12

Which hormone is used commercially to ripen green fruit?
A)IAA
B)kinetin
C)ethylene
D)GA
13

What term is used to describe the suppression of lateral growth in the presence of the terminal bud?
A)nutations
B)apical dominance
C)senescence
D)phototropism
14

Which tropism involves the movement of amyloplasts within the cells of the root cap?
A)thigmotropism
B)phototropism
C)chemotropism
D)gravitropism
15

Turgor movement occurs as a result of changes in
A)internal pressure.
B)hormone levels.
C)gravitational position.
D)photoperiod.
16

The daily closing and reopening of leaves and flowers in response to their biological clock is an example of
A)photoperiodism.
B)circadian rhythm.
C)solar tracking.
D)dormancy.
17

The movement toward or away from the source of a stimulus is known as
A)solar tracking.
B)circadian rhythm.
C)taxes.
D)bioluminescence.








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