Question 1

Directional,light-triggered plant development is known as

Accepted Answer

A) thigmotropism. 
B) phototropism. 
C) thigmonasty. 
D) photomorphogenesis. 
E) acid-growth movement. 
A) thigmotropism. 
B) phototropism. 
C) thigmonasty. 
D) photomorphogenesis. 
E) acid-growth movement.

Question 2

Cytokinins promote cell division and differentiation in plant tissues,but only in the presence of what other plant hormone?

Accepted Answer

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

Question 3

Cytokinins are related to or derived from which purine base?

Accepted Answer

A) adenine 
B) thymine 
C) guanine 
D) cytocine 
E) uracil 
A) adenine 
B) thymine 
C) guanine 
D) cytocine 
E) uracil

Question 4

Choose the letter of the best match from the following:
-A chemical derivative of adenine.

Accepted Answer

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

Question 5

A plant physiologist treats a leaf with abscisic acid and observes that the stomata close.What happened inside the guard cells during the experiment?

Accepted Answer

A) Abscisic acid influences the movement of sodium ions out of the guard cells. 
B) Abscisic acid influences the movement of potassium ions out of the guard cells. 
C) Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening. 
D) Abscisic acid binds with auxins and induces water molecules to exit the guard cells. 
E) Abscisic acid causes the guard cells to become more turgid. 
A) Abscisic acid influences the movement of sodium ions out of the guard cells. 
B) Abscisic acid influences the movement of potassium ions out of the guard cells. 
C) Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening. 
D) Abscisic acid binds with auxins and induces water molecules to exit the guard cells. 
E) Abscisic acid causes the guard cells to become more turgid.

Question 6

Coconut milk was an extremely useful additive in plant tissue culture because,in addition to amino acids,it contains

Accepted Answer

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

Question 7

Which of the following statements about abscisic acid is false?

Accepted Answer

A) It is produced chiefly in mature green leaves and in fruits. 
B) It stimulates the growth of dormant buds. 
C) It promotes leaf senescence. 
D) It plays an important role in controlling the opening and closing of stomata. 
E) It plays a role in seed dormancy. 
A) It is produced chiefly in mature green leaves and in fruits. 
B) It stimulates the growth of dormant buds. 
C) It promotes leaf senescence. 
D) It plays an important role in controlling the opening and closing of stomata. 
E) It plays a role in seed dormancy.

Question 8

A viticulturist wants to grow larger grapes.A plant physiologist suggests which specific hormone treatment to increase the internode lengths of the plants?

Accepted Answer

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

Question 9

Which of the following statements about phototropisms is false?

Accepted Answer

A) They mostly occur through a response to green light and an estradiol receptor. 
B) They include bending of plant stems toward light. 
C) Occasionally roots exhibit a weak negative phototropic response. 
D) They help plants position themselves better toward available light. 
E) They can influence the development of plant organs. 
A) They mostly occur through a response to green light and an estradiol receptor. 
B) They include bending of plant stems toward light. 
C) Occasionally roots exhibit a weak negative phototropic response. 
D) They help plants position themselves better toward available light. 
E) They can influence the development of plant organs.

Question 10

The directional growth response of plants to touch is called

Accepted Answer

A) phototropism. 
B) gravitropism. 
C) thigmotropism. 
D) photoperiodism. 
E) thermotropism. 
A) phototropism. 
B) gravitropism. 
C) thigmotropism. 
D) photoperiodism. 
E) thermotropism.

Question 11

The elongation of stems is stimulated by

Accepted Answer

A) auxin only. 
B) gibberellin only. 
C) ethylene only. 
D) auxin and gibberellin. 
E) auxin and ethylenE. 
A) auxin only. 
B) gibberellin only. 
C) ethylene only. 
D) auxin and gibberellin. 
E) auxin and ethylenE.

Question 12

What endogenous process helps plants to keep their movements and other responses synchronized with the environment?

Accepted Answer

A) purine monitoring 
B) solar tracking 
C) a circadian clock 
D) auxin cycling 
E) gravitropism 
A) purine monitoring 
B) solar tracking 
C) a circadian clock 
D) auxin cycling 
E) gravitropism

Question 13

Which gaseous hormone stimulates the ripening of fruits?

Accepted Answer

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

Question 14

_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism,where they bring about physiological responses.

Accepted Answer

A) Glycoproteins 
B) Photosynthates 
C) Hormones 
D) Heat shock proteins 
E) Pulvini 
A) Glycoproteins 
B) Photosynthates 
C) Hormones 
D) Heat shock proteins 
E) Pulvini

Question 15

Ethylene plays a number of roles in plants,including all of the following except

Accepted Answer

A) retarding stem and root elongation. 
B) hastening the ripening of fruits. 
C) increasing the storage life of apples,bananas,and oranges. 
D) accelerating the loss of damaged leaves and fruits. 
E) retarding lateral bud growth. 
A) retarding stem and root elongation. 
B) hastening the ripening of fruits. 
C) increasing the storage life of apples,bananas,and oranges. 
D) accelerating the loss of damaged leaves and fruits. 
E) retarding lateral bud growth.

Question 16

________________ is directional growth responses of plants to a unidirectional source of light.

Accepted Answer

A) Gravitropism 
B) Thigmotropism 
C) Dormancy 
D) Phototropism 
E) Thermotropism 
A) Gravitropism 
B) Thigmotropism 
C) Dormancy 
D) Phototropism 
E) Thermotropism

Question 17

Skototropism is an unusual tropism based on growth toward darkness rather than toward light as in phototropism.Which of these is an example?

Accepted Answer

A) plants growing in the shade of another plant 
B) germinating seedlings growing through the soil 
C) root tips growing in the soil 
D) vine seedlings on the forest floor searching for tree trunks to climb 
E) night-blooming flowers 
A) plants growing in the shade of another plant 
B) germinating seedlings growing through the soil 
C) root tips growing in the soil 
D) vine seedlings on the forest floor searching for tree trunks to climb 
E) night-blooming flowers

Question 18

When gibberellin binds to its receptor,what happens to activate the gibberellin-dependent transcription factor GA-TRXN?

Accepted Answer

A) Ethylene is released. 
B) A ubiquitin tag is used to degrade the GA-TRXN inhibitor. 
C) A DELLA protein is degraded,freeing the GA-TRXN. 
D) A DELLA protein is attached to GA-TRXN to activate it. 
E) The gibberellin is transferred to an alternate binding sitE. 
A) Ethylene is released. 
B) A ubiquitin tag is used to degrade the GA-TRXN inhibitor. 
C) A DELLA protein is degraded,freeing the GA-TRXN. 
D) A DELLA protein is attached to GA-TRXN to activate it. 
E) The gibberellin is transferred to an alternate binding sitE.

Question 19

Auxin from the apical bud

Accepted Answer

A) stimulates the growth of lateral buds. 
B) inhibits the transport of sucrose towards the roots. 
C) stimulates the growth of leaves. 
D) inhibits the growth of lateral buds. 
E) inhibits tip elongation. 
A) stimulates the growth of lateral buds. 
B) inhibits the transport of sucrose towards the roots. 
C) stimulates the growth of leaves. 
D) inhibits the growth of lateral buds. 
E) inhibits tip elongation.

Question 20

Which of the following traits does not apply to brassinosteroids?

Accepted Answer

A) They were first discovered in pollen. 
B) They are released from the cell wall by enzymes secreted by pathogens. 
C) Their functions overlap with those of auxins and gibberellins. 
D) Their characteristics are similar to animal steroids. 
E) They may have evolved before the evolutionary divergence of plants and animals. 
A) They were first discovered in pollen. 
B) They are released from the cell wall by enzymes secreted by pathogens. 
C) Their functions overlap with those of auxins and gibberellins. 
D) Their characteristics are similar to animal steroids. 
E) They may have evolved before the evolutionary divergence of plants and animals.

Exam 41: Sensory Systems in Plants

Directional,light-triggered plant development is known as

Cytokinins promote cell division and differentiation in plant tissues,but only in the presence of what other plant hormone?

Cytokinins are related to or derived from which purine base?

Choose the letter of the best match from the following: -A chemical derivative of adenine.

A plant physiologist treats a leaf with abscisic acid and observes that the stomata close.What happened inside the guard cells during the experiment?

Coconut milk was an extremely useful additive in plant tissue culture because,in addition to amino acids,it contains

Which of the following statements about abscisic acid is false?

A viticulturist wants to grow larger grapes.A plant physiologist suggests which specific hormone treatment to increase the internode lengths of the plants?

Which of the following statements about phototropisms is false?

The directional growth response of plants to touch is called

The elongation of stems is stimulated by

What endogenous process helps plants to keep their movements and other responses synchronized with the environment?

Which gaseous hormone stimulates the ripening of fruits?

_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism,where they bring about physiological responses.

Ethylene plays a number of roles in plants,including all of the following except

________________ is directional growth responses of plants to a unidirectional source of light.

Skototropism is an unusual tropism based on growth toward darkness rather than toward light as in phototropism.Which of these is an example?

When gibberellin binds to its receptor,what happens to activate the gibberellin-dependent transcription factor GA-TRXN?

Auxin from the apical bud

Which of the following traits does not apply to brassinosteroids?

The Science of Biology

The Nature of Molecules

The Chemical Building Blocks of Life

Cell Structure

Membranes

Energy and Metabolism

How Cells Harvest Energy

Photosynthesis

Cell Communication

How Cells Divide

Sexual Reproduction and Meiosis

Patterns of Inheritance

Chromosomes Mapping and the Meiosis - Inheritance Connection

Dna: the Genetic Material

Genes and How They Work

Control of Gene Expression

Biotechnology

Genomics

Cellular Mechanisms of Development

Genes Within Populations

The Evidence for Evolution

The Origin of Species

Systematics and the Phylogenetic Revolution

Genome Evolution

Evolution of Development

The Tree of Life

Viruses

Prokaryotes

Protists

Overview of Green Plants

Fungi

Overview of Animal Diversity

Noncoelomate Invertebrates

Coelomate Invertebrates

Vertebrates

Plant Form

Vegetative Plant Development

Transport in Plants

Plant Nutrition and Soils

Plant Defense Responses

Plant Reproduction

The Animal Body and Principles of Regulation

The Nervous System

Sensory Systems

The Endocrine System

The Musculoskeletal System

The Digestive System

The Respiratory System

The Circulatory System

Osmotic Regulation and the Urinary System

The Immune System

The Reproductive System

Animal Development

Behavioral Biology

Population Ecology

Community of Ecology

Dynamics of Ecosystems

The Biosphere

Conservation Biology