Question 1

Which environmental factor is most significant for flowering?

Accepted Answer

A)  Water availability 
B)  Light intensity 
C)  Temperature 
D)  Nitrogen availability 
E)  Day length 
A)  Water availability 
B)  Light intensity 
C)  Temperature 
D)  Nitrogen availability 
E)  Day length

Question 2

A plantʹs tendency to grow toward a source of light is called

Accepted Answer

A)  phototropism. 
B)  lumitropism. 
C)  gravitropism. 
D)  amylotropism. 
E)  thigmotropism. 
A)  phototropism. 
B)  lumitropism. 
C)  gravitropism. 
D)  amylotropism. 
E)  thigmotropism.

Question 3

Auxins are used in rooting powders to encourage the formation of well-branched roots.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

Plants have tropisms, such as

Question 6

If a storm breaks off the top of a tree, within a year or two, one of the lower branches will grow upward and become the new tree top, while inhibiting other branches from doing the same. This is an example of

Accepted Answer

A)  phytochrome inhibition. 
B)  the presence of cytokinins. 
C)  the influence of ethylene. 
D)  the formation of an abscission layer. 
E)  apical dominance. 
A)  phytochrome inhibition. 
B)  the presence of cytokinins. 
C)  the influence of ethylene. 
D)  the formation of an abscission layer. 
E)  apical dominance.

Question 7

A group of plant geneticists discovers a mutant plant that has a deficiency in gibberellin production. All other hormones, including auxins, cytokinins, florigens, ethylene, and abscisic acid, are produced in normal quantities and are not directly affected by this mutation. Based on this scenario, the mutant plant most likely exhibits

Accepted Answer

A)  a lack of gravitropism in the roots. 
B)  stomata that donʹt close. 
C)  delayed senescence. 
D)  a lack of phototropism in the shoots. 
E)  a dwarf growth pattern (very short stem). 
A)  a lack of gravitropism in the roots. 
B)  stomata that donʹt close. 
C)  delayed senescence. 
D)  a lack of phototropism in the shoots. 
E)  a dwarf growth pattern (very short stem).

Question 8

Which of these hormones helps plants tolerate drought and cold?

Accepted Answer

A)  Cytokinin 
B)  Auxin 
C)  Ethylene 
D)  Abscisic acid 
E)  Gibberellin 
A)  Cytokinin 
B)  Auxin 
C)  Ethylene 
D)  Abscisic acid 
E)  Gibberellin

Question 9

If a poplar forest is attacked by gypsy moths, how do the trees around the infected area tend to become somewhat resistant?

Accepted Answer

Plants that are attacked by in

Question 10

When a peach blossom is pollinated, auxin and/or __________stimulates the development of fruit from the ovary.

Accepted Answer

The answer of When a peach blossom is pollinated, auxin...

Question 11

Short-day plants flower only if

Accepted Answer

A)  abscisic acid is available. 
B)  their phytochrome-mediated responses are inhibited. 
C)  the duration of uninterrupted darkness is longer than some species-specific length. 
D)  they are in the shade. 
A)  abscisic acid is available. 
B)  their phytochrome-mediated responses are inhibited. 
C)  the duration of uninterrupted darkness is longer than some species-specific length. 
D)  they are in the shade.

Question 12

Tomatoes that are planted upside down still grow upright, displaying

Accepted Answer

A)  phototropism. 
B)  lumitropism. 
C)  gravitropism. 
D)  amylotropism. 
E)  thigmotropism. 
A)  phototropism. 
B)  lumitropism. 
C)  gravitropism. 
D)  amylotropism. 
E)  thigmotropism.

Question 13

Some plants under attack by insects can communicate this information to other parts of the same plant and to nearby plants via

Accepted Answer

A)  vibrations in their roots. 
B)  low-frequency sound waves. 
C)  the release of chemicals into their roots. 
D)  the release of chemicals into the air. 
A)  vibrations in their roots. 
B)  low-frequency sound waves. 
C)  the release of chemicals into their roots. 
D)  the release of chemicals into the air.

Question 14

Roots grow downward and shoots grow upward due to

Accepted Answer

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

Question 15

__________plants bloom only when the duration of uninterrupted darkness is shorter than a critical length.

Accepted Answer

A)  Neutral-day 
B)  Gibberellin-regulated 
C)  Phytochrome-system 
D)  Short-day 
E)  Long-day 
A)  Neutral-day 
B)  Gibberellin-regulated 
C)  Phytochrome-system 
D)  Short-day 
E)  Long-day

Question 16

At night, when little red light is available to the plants in an area, what occurs?

Accepted Answer

A)  Pfr is converted to Pr. 
B)  Pr and Pfr are both destroyed. 
C)  Pr is converted to Pfr. 
D)  Pr and Pfr are both formed from inactive phytochrome. 
E)  Pr stimulates flowering. 
A)  Pfr is converted to Pr. 
B)  Pr and Pfr are both destroyed. 
C)  Pr is converted to Pfr. 
D)  Pr and Pfr are both formed from inactive phytochrome. 
E)  Pr stimulates flowering.

Question 17

The process of aging is called

Accepted Answer

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

Question 18

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 19

In 2007, research confirmed the existence of hormones that control the timing of flowering. These hormones are called

Accepted Answer

A)  ethylenes. 
B)  auxins. 
C)  florigens. 
D)  cytokinins. 
E)  abscisic acids. 
A)  ethylenes. 
B)  auxins. 
C)  florigens. 
D)  cytokinins. 
E)  abscisic acids.

Question 20

Most scientists believe that the lateral buds farthest from the top of a tree are the least inhibited from sprouting because they

Accepted Answer

A)  are shaded by the top of the tree. 
B)  receive the most cytokinins from the roots. 
C)  produce gibberellins. 
D)  are the most affected by gravity. 
E)  receive the least light. 
A)  are shaded by the top of the tree. 
B)  receive the most cytokinins from the roots. 
C)  produce gibberellins. 
D)  are the most affected by gravity. 
E)  receive the least light.

Exam 46: Plant Responses to the Environment

Which environmental factor is most significant for flowering?

A plantʹs tendency to grow toward a source of light is called

Auxins are used in rooting powders to encourage the formation of well-branched roots.

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

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

If a storm breaks off the top of a tree, within a year or two, one of the lower branches will grow upward and become the new tree top, while inhibiting other branches from doing the same. This is an example of

Which of these hormones helps plants tolerate drought and cold?

If a poplar forest is attacked by gypsy moths, how do the trees around the infected area tend to become somewhat resistant?

When a peach blossom is pollinated, auxin and/or __________stimulates the development of fruit from the ovary.

Short-day plants flower only if

Tomatoes that are planted upside down still grow upright, displaying

Some plants under attack by insects can communicate this information to other parts of the same plant and to nearby plants via

Roots grow downward and shoots grow upward due to

__________plants bloom only when the duration of uninterrupted darkness is shorter than a critical length.

At night, when little red light is available to the plants in an area, what occurs?

The process of aging is called

Plants are able to measure the length of the night using the __________system.

In 2007, research confirmed the existence of hormones that control the timing of flowering. These hormones are called

Most scientists believe that the lateral buds farthest from the top of a tree are the least inhibited from sprouting because they

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

Cellular Reproduction

Meiosis: the Basis of Sexual 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 Amid 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

Energy Flow and Nutrient Cycling in Ecosystems

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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