Question 1

Rice plants grow rapidly and become spindly due to the presence of gibberellic acid produced by a fungus.

Accepted Answer

A) True 
 B)False  True

Question 2

Which of the following statements concerning the role of auxin in developing leaves of Arabidopsis is FALSE?

Accepted Answer

A) Auxin is produced first at the leaf base and later at the tip. 
B) Auxin stimulates the differentiation of vascular tissue. 
C) Auxin induces the formation of lateral veins. 
D) Auxin is produced by cells that will differentiate into hydathodes. 
E) Auxin induces the formation of the midvein. 
A) Auxin is produced first at the leaf base and later at the tip. 
B) Auxin stimulates the differentiation of vascular tissue. 
C) Auxin induces the formation of lateral veins. 
D) Auxin is produced by cells that will differentiate into hydathodes. 
E) Auxin induces the formation of the midvein. A

Question 3

Plant hormones usually act alone and only occasionally "cross-talk."

Accepted Answer

A) True 
 B)False  False

Question 4

Which of the following statements about gibberellins is FALSE?

Accepted Answer

A) They induce bolting in long-day plants. 
B) They induce early flowering in biennials. 
C) They cause rosette formation in cabbages and carrots. 
D) They cause development of parthenocarpic apples and currants. 
E) They are used in the commercial production of seedless grapes. 
A) They induce bolting in long-day plants. 
B) They induce early flowering in biennials. 
C) They cause rosette formation in cabbages and carrots. 
D) They cause development of parthenocarpic apples and currants. 
E) They are used in the commercial production of seedless grapes.

Question 5

Polar transport is ______ in stems, _______in leaves, and ______ in roots.

Accepted Answer

A) acropetal; acropetal; acropetal 
B) basipetal; basipetal; basipetal 
C) acropetal; acropetal; basipetal 
D) basipetal; acropetal; acropetal 
E) basipetal; basipetal; acropetal 
A) acropetal; acropetal; acropetal 
B) basipetal; basipetal; basipetal 
C) acropetal; acropetal; basipetal 
D) basipetal; acropetal; acropetal 
E) basipetal; basipetal; acropetal

Question 6

Ethylene stimulates internodal elongation of rice plants that are submerged during monsoon flooding.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following statements concerning endogenous brassinosteroids is FALSE?

Accepted Answer

A) They are found in virtually every part of the plant. 
B) They are synthesized from castasterone. 
C) They are essential for tracheary element differentiation. 
D) They are required for normal plant growth. 
E) They are transported from root to shoot in the xylem. 
A) They are found in virtually every part of the plant. 
B) They are synthesized from castasterone. 
C) They are essential for tracheary element differentiation. 
D) They are required for normal plant growth. 
E) They are transported from root to shoot in the xylem.

Question 8

Which of the following statements about cytokinins is FALSE?

Accepted Answer

A) They stimulate cell division. 
B) They are present in bleeding sap. 
C) Kinetin is a naturally occurring cytokinin. 
D) They are found primarily in actively dividing tissues and in root tips. 
E) The most active naturally occurring cytokinin is zeatin. 
A) They stimulate cell division. 
B) They are present in bleeding sap. 
C) Kinetin is a naturally occurring cytokinin. 
D) They are found primarily in actively dividing tissues and in root tips. 
E) The most active naturally occurring cytokinin is zeatin.

Question 9

Folke Skoog and his colleagues found that ______ stimulated cells of tobacco to divide in culture.

Accepted Answer

A) coconut milk 
B) a sugar 
C) a salt 
D) a vitamin 
E) auxin 
A) coconut milk 
B) a sugar 
C) a salt 
D) a vitamin 
E) auxin

Question 10

In roots of Arabidopsis, cytokinin ______ the initiation of lateral roots by preventing the establishment of a(n) ______ gradient.

Accepted Answer

A) inhibits; auxin 
B) inhibits; gibberellin 
C) stimulates; auxin 
D) stimulates; gibberellin 
E) stimulates; ethylene 
A) inhibits; auxin 
B) inhibits; gibberellin 
C) stimulates; auxin 
D) stimulates; gibberellin 
E) stimulates; ethylene

Question 11

All plant hormones:

Accepted Answer

A) are equally effective in free and bound forms. 
B) act in the tissues where they are produced. 
C) are stimulatory. 
D) are active in large quantities. 
E) communicate information. 
A) are equally effective in free and bound forms. 
B) act in the tissues where they are produced. 
C) are stimulatory. 
D) are active in large quantities. 
E) communicate information.

Question 12

Recent evidence indicates that auxin does not directly inhibit the growth of lateral buds.

Accepted Answer

A) True 
 B)False

Question 13

Cytokinins are synthesized in roots and transported in the xylem to other parts of the plant.

Accepted Answer

A) True 
 B)False

Question 14

______ is very similar to the amino acid tryptophan.

Accepted Answer

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

Question 15

Which of the following statements about fruit development is FALSE?

Accepted Answer

A) A parthenocarpic fruit lacks seeds. 
B) A parthenocarpic fruit lacks ovules. 
C) Applications of auxin can stimulate carpels to develop into a fruit. 
D) Removal of seeds from a developing fruit results in reduced fruit growth. 
E) Application of auxin to a deseeded receptacle stimulates fruit growth. 
A) A parthenocarpic fruit lacks seeds. 
B) A parthenocarpic fruit lacks ovules. 
C) Applications of auxin can stimulate carpels to develop into a fruit. 
D) Removal of seeds from a developing fruit results in reduced fruit growth. 
E) Application of auxin to a deseeded receptacle stimulates fruit growth.

Question 16

If you cut the tip off a bean plant, the lateral buds will stop developing.

Accepted Answer

A) True 
 B)False

Question 17

In Arabidopsis, the ethylene receptor is located in the plasma membrane.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following statements about ethylene is FALSE?

Accepted Answer

A) The final step in its synthesis in plants is catalyzed by enzymes on the tonoplast. 
B) Its synthesis in plants begins with the amino acid tryptophan. 
C) It exerts an influence on many aspects of plant growth and development. 
D) It is the active component of illuminating gas that affects plant development. 
E) It has the formula H2C=CH2. 
A) The final step in its synthesis in plants is catalyzed by enzymes on the tonoplast. 
B) Its synthesis in plants begins with the amino acid tryptophan. 
C) It exerts an influence on many aspects of plant growth and development. 
D) It is the active component of illuminating gas that affects plant development. 
E) It has the formula H2C=CH2.

Question 19

A PIN protein:

Accepted Answer

A) is an auxin influx carrier. 
B) is an auxin efflux carrier. 
C) catalyzes the conversion of auxin to tryptophan. 
D) catalyzes the conversion of auxin to indole. 
E) is a synthetic auxin. 
A) is an auxin influx carrier. 
B) is an auxin efflux carrier. 
C) catalyzes the conversion of auxin to tryptophan. 
D) catalyzes the conversion of auxin to indole. 
E) is a synthetic auxin.

Question 20

Mutants of Arabidopsis that lack brassinosteroids have leaves that are smaller and have fewer cells than the wild-type.

Accepted Answer

A) True 
 B)False

Exam 27: Regulating Growth and Development: the Plant Hormones

Rice plants grow rapidly and become spindly due to the presence of gibberellic acid produced by a fungus.

Which of the following statements concerning the role of auxin in developing leaves of Arabidopsis is FALSE?

Plant hormones usually act alone and only occasionally "cross-talk."

Which of the following statements about gibberellins is FALSE?

Polar transport is ______ in stems, _______in leaves, and ______ in roots.

Ethylene stimulates internodal elongation of rice plants that are submerged during monsoon flooding.

Which of the following statements concerning endogenous brassinosteroids is FALSE?

Which of the following statements about cytokinins is FALSE?

Folke Skoog and his colleagues found that ______ stimulated cells of tobacco to divide in culture.

In roots of Arabidopsis, cytokinin ______ the initiation of lateral roots by preventing the establishment of a(n) ______ gradient.

All plant hormones:

Recent evidence indicates that auxin does not directly inhibit the growth of lateral buds.

Cytokinins are synthesized in roots and transported in the xylem to other parts of the plant.

______ is very similar to the amino acid tryptophan.

Which of the following statements about fruit development is FALSE?

If you cut the tip off a bean plant, the lateral buds will stop developing.

In Arabidopsis, the ethylene receptor is located in the plasma membrane.

Which of the following statements about ethylene is FALSE?

A PIN protein:

Mutants of Arabidopsis that lack brassinosteroids have leaves that are smaller and have fewer cells than the wild-type.

Botany: an Introduction

The Molecular Composition of Plant Cells

The Plant Cell and the Cell Cycle

The Movement of Substances Into and Out of Cells

The Flow of Energy

Respiration

Photosynthesis, Light, and Life

Sexual Reproduction and Heredity

The Chemistry of Heredity and Gene Expression

Recombinant Dna Technology, Plant Biotechnology, and Genomics

The Process of Evolution

Systematics: the Science of Biological Diversity

Prokaryotes and Viruses

Fungi

Protists: Algae and Heterotrophic Protists

Bryophytes

Seedless Vascular Plants

Gymnosperms

Introduction to the Angiosperms

Evolution of the Angiosperms

Plants and People

Early Development of the Plant Body

Cells and Tissues of the Plant Body

The Root: Structure and Development

The Shoot: Primary Structure and Development

Secondary Growth in Stems

External Factors and Plant Growth

Plant Nutrition and Soils

The Movement of Water and Solutes in Plants

The Dynamics of Communities and Ecosystems

Global Ecology

Filters

Polar transport is __ in stems, _in leaves, and ____ in roots.

In roots of Arabidopsis, cytokinin the initiation of lateral roots by preventing the establishment of a(n) gradient.