Question 1

Circadian rhythms persist even when all environmental conditions are kept constant.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following statements concerning the phytochrome molecule is FALSE?

Accepted Answer

A) The phytochromes in Arabidopsis are encoded by just 2 genes. 
B) Most plants have several different phytochromes. 
C) The chromophore portion is similar to the phycobilins in cyanobacteria. 
D) One part is a protein. 
E) The chromophore portion absorbs light. 
A) The phytochromes in Arabidopsis are encoded by just 2 genes. 
B) Most plants have several different phytochromes. 
C) The chromophore portion is similar to the phycobilins in cyanobacteria. 
D) One part is a protein. 
E) The chromophore portion absorbs light.

Question 3

If a short-day plant receives a one-minute exposure to light in the middle of the dark period rather than continuous darkness, it will:

Accepted Answer

A) produce more flowers. 
B) produce smaller flowers. 
C) produce larger flowers. 
D) flower at a lower temperature. 
E) not flower. 
A) produce more flowers. 
B) produce smaller flowers. 
C) produce larger flowers. 
D) flower at a lower temperature. 
E) not flower.

Question 4

In the process of scarification, seeds are treated with solvents that dissolve the waxes in the seed coat.

Accepted Answer

A) True 
 B)False

Question 5

In roots, statocytes are located in the root cap.

Accepted Answer

A) True 
 B)False

Question 6

In roots, statoliths are localized in the:

Accepted Answer

A) endodermis. 
B) vascular tissues. 
C) starch sheath. 
D) epidermis of the root cap. 
E) root cap columella. 
A) endodermis. 
B) vascular tissues. 
C) starch sheath. 
D) epidermis of the root cap. 
E) root cap columella.

Question 7

The bulbs of tulips and hyacinths can be "forced" by bringing them indoors before the temperature drops.

Accepted Answer

A) True 
 B)False

Question 8

Phytochrome-interacting factors (PIFs) are located in the nucleus.

Accepted Answer

A) True 
 B)False

Question 9

When lettuce seeds are exposed to red light:

Accepted Answer

A) Pfr is converted to Pr. 
B) Pr is converted to Pfr. 
C) 660-nanometer light is converted to 730-nanometer light. 
D) 730-nanometer light is converted to 660-nanometer light. 
E) they will not germinate. 
A) Pfr is converted to Pr. 
B) Pr is converted to Pfr. 
C) 660-nanometer light is converted to 730-nanometer light. 
D) 730-nanometer light is converted to 660-nanometer light. 
E) they will not germinate.

Question 10

______ light is the most effective in producing a phototropic response.

Accepted Answer

A) Green 
B) Yellow 
C) Orange 
D) Blue 
E) Red 
A) Green 
B) Yellow 
C) Orange 
D) Blue 
E) Red

Question 11

In order to flower, short-day plants must have a light period shorter than a critical length, and long-day plants must have a light period longer than a critical length.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following statements about a pulvinus is FALSE?

Accepted Answer

A) It is a joint-like thickening at the base of a leaf or a leaflet. 
B) It is responsible for most nyctinastic leaf movements. 
C) It lacks vascular tissue. 
D) It contains parenchyma cells. 
E) Some of its cells undergo changes in turgor. 
A) It is a joint-like thickening at the base of a leaf or a leaflet. 
B) It is responsible for most nyctinastic leaf movements. 
C) It lacks vascular tissue. 
D) It contains parenchyma cells. 
E) Some of its cells undergo changes in turgor.

Question 13

Which of the following statements about heliotropism is FALSE?

Accepted Answer

A) It is a diurnal movement involving pulvini. 
B) It is a process involving an orientation to the sun. 
C) It involves the leaves and flowers of many plants. 
D) It is also called solar tracking. 
E) It involves a mechanism similar to that of stem phototropism. 
A) It is a diurnal movement involving pulvini. 
B) It is a process involving an orientation to the sun. 
C) It involves the leaves and flowers of many plants. 
D) It is also called solar tracking. 
E) It involves a mechanism similar to that of stem phototropism.

Question 14

Which of the following is NOT a finding from experiments on the role of auxin in phototropism of coleoptile tips?

Accepted Answer

A) Light does not affect the total amount of auxin. 
B) Light does not destroy auxin. 
C) Auxin migrates from the lighted side to the shaded side. 
D) More auxin can be isolated from the shaded side of an intact tip than from the lighted side. 
E) If the tip is split and the two halves separated by a barrier, more auxin can be isolated from the shaded side than from the lighted side. 
A) Light does not affect the total amount of auxin. 
B) Light does not destroy auxin. 
C) Auxin migrates from the lighted side to the shaded side. 
D) More auxin can be isolated from the shaded side of an intact tip than from the lighted side. 
E) If the tip is split and the two halves separated by a barrier, more auxin can be isolated from the shaded side than from the lighted side.

Question 15

Cold hardiness refers to the process of preparing the plant for winter.

Accepted Answer

A) True 
 B)False

Question 16

In Arabidopsis, the FT gene encodes the FT protein, which is the florigen.

Accepted Answer

A) True 
 B)False

Question 17

In shoot gravitropism, auxin is distributed to the lower side where it stimulates cell expansion.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following statements about thigmotropism is FALSE?

Accepted Answer

A) It enables roots to navigate around rocks. 
B) It is a response to contact with a solid object. 
C) An example is the climbing of tendrils. 
D) Cells touching the support lengthen more than cells on the other side. 
E) The stems of peas can store the memory of tactile stimulation. 
A) It enables roots to navigate around rocks. 
B) It is a response to contact with a solid object. 
C) An example is the climbing of tendrils. 
D) Cells touching the support lengthen more than cells on the other side. 
E) The stems of peas can store the memory of tactile stimulation.

Question 19

In Arabidopsis thaliana, touch induces the expression of genes that encode proteins related to ______, suggesting a role for ______ in thigmomorphogenesis.

Accepted Answer

A) an endogenous inhibitor; the biological clock 
B) amylase; starch 
C) the cytoskeleton; microtubules 
D) calmodulin; calcium 
E) chlorophyll; magnesium 
A) an endogenous inhibitor; the biological clock 
B) amylase; starch 
C) the cytoskeleton; microtubules 
D) calmodulin; calcium 
E) chlorophyll; magnesium

Question 20

In tropisms, a response toward the stimulus is said to be negative.

Accepted Answer

A) True 
 B)False

Exam 28: External Factors and Plant Growth

Circadian rhythms persist even when all environmental conditions are kept constant.

Which of the following statements concerning the phytochrome molecule is FALSE?

If a short-day plant receives a one-minute exposure to light in the middle of the dark period rather than continuous darkness, it will:

In the process of scarification, seeds are treated with solvents that dissolve the waxes in the seed coat.

In roots, statocytes are located in the root cap.

In roots, statoliths are localized in the:

The bulbs of tulips and hyacinths can be "forced" by bringing them indoors before the temperature drops.

Phytochrome-interacting factors (PIFs) are located in the nucleus.

When lettuce seeds are exposed to red light:

______ light is the most effective in producing a phototropic response.

In order to flower, short-day plants must have a light period shorter than a critical length, and long-day plants must have a light period longer than a critical length.

Which of the following statements about a pulvinus is FALSE?

Which of the following statements about heliotropism is FALSE?

Which of the following is NOT a finding from experiments on the role of auxin in phototropism of coleoptile tips?

Cold hardiness refers to the process of preparing the plant for winter.

In Arabidopsis, the FT gene encodes the FT protein, which is the florigen.

In shoot gravitropism, auxin is distributed to the lower side where it stimulates cell expansion.

Which of the following statements about thigmotropism is FALSE?

In Arabidopsis thaliana, touch induces the expression of genes that encode proteins related to ______, suggesting a role for ______ in thigmomorphogenesis.

In tropisms, a response toward the stimulus is said to be negative.

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

Regulating Growth and Development: the Plant Hormones

Plant Nutrition and Soils

The Movement of Water and Solutes in Plants

The Dynamics of Communities and Ecosystems

Global Ecology

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In Arabidopsis thaliana, touch induces the expression of genes that encode proteins related to , suggesting a role for in thigmomorphogenesis.