Question 1

Radish plants under insect attack:

Accepted Answer

A) produce the defensive toxin nicotine. 
B) produce bitter chemicals and grow spines on their leaves. 
C) rapidly fold their petioles together. 
D) release salicin, which is converted to salicylic acid within the insect. 
A) produce the defensive toxin nicotine. 
B) produce bitter chemicals and grow spines on their leaves. 
C) rapidly fold their petioles together. 
D) release salicin, which is converted to salicylic acid within the insect.

Question 2

A botanist who wants to stimulate flower formation could treat the plants with:

Accepted Answer

A) abscisic acid. 
B) auxin. 
C) cytokinin. 
D) gibberellin. 
E) ethylene. 
A) abscisic acid. 
B) auxin. 
C) cytokinin. 
D) gibberellin. 
E) ethylene.

Question 3

The synthetic herbicide 2,4-D is actually a(n):

Accepted Answer

A) cytokinin. 
B) ethylene gas. 
C) florigen. 
D) auxin. 
E) gibberellin. 
A) cytokinin. 
B) ethylene gas. 
C) florigen. 
D) auxin. 
E) gibberellin.

Question 4

Plants that flower in Canada in August and in the United States in July (when nights are short)are ________ plants.

Accepted Answer

A) day-neutral 
B) long-day 
C) short-day 
D) indeterminate-day 
E) night-determinate 
A) day-neutral 
B) long-day 
C) short-day 
D) indeterminate-day 
E) night-determinate

Question 5

Plants are able to measure the length of the night using the ________ system.

Accepted Answer

The answer of Plants are able to measure the length...

Question 6

In seeds from northern areas, what plant hormone often needs to be removed to get them to germinate, and how can this be done?

Accepted Answer

abscisic a

Question 7

The relative sizes of roots and shoots are regulated by interactions between:

Accepted Answer

A) auxins and cytokinins. 
B) abscisic acid and cytokinins. 
C) cytokinins and ethylene. 
D) ethylene and abscisic acid. 
E) gibberellins and abscisic acid. 
A) auxins and cytokinins. 
B) abscisic acid and cytokinins. 
C) cytokinins and ethylene. 
D) ethylene and abscisic acid. 
E) gibberellins and abscisic acid.

Question 8

What phenomenon is illustrated in this figure?

Accepted Answer

A) gravitropism 
B) phototropism 
C) thigmotropism 
D) apical dominance 
A) gravitropism 
B) phototropism 
C) thigmotropism 
D) apical dominance

Question 9

Plants that flower in the United States only in the early spring (when nights are long)are ________ plants.

Accepted Answer

A) day-neutral 
B) long-day 
C) short-day 
D) indeterminate-day 
E) night-determinate 
A) day-neutral 
B) long-day 
C) short-day 
D) indeterminate-day 
E) night-determinate

Question 10

The process of aging is called:

Accepted Answer

A) maturation. 
B) elongation. 
C) abscission. 
D) death. 
E) senescence. 
A) maturation. 
B) elongation. 
C) abscission. 
D) death. 
E) senescence.

Question 11

Which of these hormones causes cell elongation, promotes apical dominance, and stimulates root branching?

Accepted Answer

A) abscisic acid 
B) auxin 
C) cytokinin 
D) gibberellin 
E) ethylene 
A) abscisic acid 
B) auxin 
C) cytokinin 
D) gibberellin 
E) ethylene

Question 12

The phytochrome that is active and absorbs far-red light is:

Accepted Answer

A) Pr. 
B) Pfr. 
C) Pa. 
D) Pe. 
A) Pr. 
B) Pfr. 
C) Pa. 
D) Pe.

Question 13

Abscisic acid enforces dormancy of seeds by:

Accepted Answer

A) waterproofing the seed coat. 
B) preventing endosperm development. 
C) activating gibberellin. 
D) preventing the growth of the embryo. 
E) binding to the molecule ATP. 
A) waterproofing the seed coat. 
B) preventing endosperm development. 
C) activating gibberellin. 
D) preventing the growth of the embryo. 
E) binding to the molecule ATP.

Question 14

The ideal Christmas tree has a conical shape. The top of the tree is pointed and narrow, with clear apical dominance, and the bottom of the tree is wide, with extensive lateral branching. Certain evergreen species are suitable for use as Christmas trees because they have this shape normally and thus require little pruning or training as they grow. For example, spruces and firs are often grown as Christmas trees, whereas yews and longleaf pines are not. Based on this information, tree shape is likely due to:

Accepted Answer

A) low levels of auxins near the top and low levels of cytokinins at the bottom of the tree. 
B) low levels of auxins near the top and high levels of cytokinins at the bottom of the tree. 
C) high levels of auxins near the top and high levels of cytokinins at the bottom of the tree. 
D) high levels of auxins near the top and low levels of cytokinins at the bottom of the tree. 
A) low levels of auxins near the top and low levels of cytokinins at the bottom of the tree. 
B) low levels of auxins near the top and high levels of cytokinins at the bottom of the tree. 
C) high levels of auxins near the top and high levels of cytokinins at the bottom of the tree. 
D) high levels of auxins near the top and low levels of cytokinins at the bottom of the tree.

Question 15

How a plant cell responds to a hormone depends on the:

Accepted Answer

A) cell that secretes the hormone. 
B) "shelf life" of the hormone. 
C) concentration of the hormone. 
D) presence of other plant cells nearby. 
E) amount of available sunlight. 
A) cell that secretes the hormone. 
B) "shelf life" of the hormone. 
C) concentration of the hormone. 
D) presence of other plant cells nearby. 
E) amount of available sunlight.

Question 16

Defend this statement: Plants are just as capable of responding to their environment as are animals.

Accepted Answer

Plants have tropisms, such as

Question 17

Gravitropism is a plant's:

Accepted Answer

A) directional response to gravity. 
B) response to stress-inducing situations. 
C) ability to grow only upward. 
D) ability to form an abscission layer, so that the fruits and leaves fall from the plant. 
E) apical dominance. 
A) directional response to gravity. 
B) response to stress-inducing situations. 
C) ability to grow only upward. 
D) ability to form an abscission layer, so that the fruits and leaves fall from the plant. 
E) apical dominance.

Question 18

Corn plants release chemicals that attract a parasitic wasp. The wasp, in turn, protects the corn plants from destruction by:

Accepted Answer

A) caterpillars. 
B) root worms. 
C) other wasps. 
D) too dry soils. 
E) stinging bees. 
A) caterpillars. 
B) root worms. 
C) other wasps. 
D) too dry soils. 
E) stinging bees.

Question 19

The only plant hormone that is a gas is cytokinin. True or False?

Accepted Answer

A) True 
 B)False

Question 20

Based on this figure, which of the following plants will NOT flower under long-day or interrupted-night conditions?

Accepted Answer

A) iris 
B) chrysanthemum 
C) rose 
A) iris 
B) chrysanthemum 
C) rose

Exam 45: Plant Responses to the Environment

Radish plants under insect attack:

A botanist who wants to stimulate flower formation could treat the plants with:

The synthetic herbicide 2,4-D is actually a(n):

Plants that flower in Canada in August and in the United States in July (when nights are short)are ________ plants.

Plants are able to measure the length of the night using the ________ system.

In seeds from northern areas, what plant hormone often needs to be removed to get them to germinate, and how can this be done?

The relative sizes of roots and shoots are regulated by interactions between:

What phenomenon is illustrated in this figure?

Plants that flower in the United States only in the early spring (when nights are long)are ________ plants.

The process of aging is called:

Which of these hormones causes cell elongation, promotes apical dominance, and stimulates root branching?

The phytochrome that is active and absorbs far-red light is:

Abscisic acid enforces dormancy of seeds by:

How a plant cell responds to a hormone depends on the:

Defend this statement: Plants are just as capable of responding to their environment as are animals.

Gravitropism is a plant's:

Corn plants release chemicals that attract a parasitic wasp. The wasp, in turn, protects the corn plants from destruction by:

The only plant hormone that is a gas is cytokinin. True or False?

Based on this figure, which of the following plants will NOT flower under long-day or interrupted-night conditions?

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

The Continuity of Life: Cellular Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amidst Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity Ii: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

How Do Ecosystems Work

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

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