Question 1

If a mutation decreased the radius of a xylem vessel threefold, there would be an 81-fold increase in the volume of liquid moving through the vessel.

Accepted Answer

A) True 
 B)False  False

Question 2

Water is able to cross plant plasma membranes by a combination of

Accepted Answer

A) osmosis and aquaporins. 
B) evaporation and diffusion. 
C) root pressure and turgidity. 
D) diffusion and phloem. 
A) osmosis and aquaporins. 
B) evaporation and diffusion. 
C) root pressure and turgidity. 
D) diffusion and phloem. A

Question 3

Closing the stomata for an extended period of time would lead to an increase in G3P in the mesophyll cells.

Accepted Answer

A) True 
 B)False  False

Question 4

Most of the water absorbed by the plant enters through the

Accepted Answer

A) root apical meristem. 
B) root cap. 
C) root hairs. 
D) stomata. 
A) root apical meristem. 
B) root cap. 
C) root hairs. 
D) stomata.

Question 5

Which of the following statements does not apply to aquaporins?

Accepted Answer

A) They are water transport channels. 
B) They are unique to plant cells. 
C) They occur in the plasma membrane. 
D) They speed up osmosis. 
A) They are water transport channels. 
B) They are unique to plant cells. 
C) They occur in the plasma membrane. 
D) They speed up osmosis.

Question 6

Which of these situations regarding phloem sources and sinks is not correct?

Accepted Answer

A) The root of a carrot plant is a source. 
B) Young leaves are sinks. 
C) A growing pumpkin is a sink. 
D) In a seedling, the cotyledons would be sources. 
A) The root of a carrot plant is a source. 
B) Young leaves are sinks. 
C) A growing pumpkin is a sink. 
D) In a seedling, the cotyledons would be sources.

Question 7

On a short-term basis, water loss in plants may be controlled by the

Accepted Answer

A) bending of the petioles on the leaves. 
B) closing of the stele in the roots. 
C) closing of the stomata in the leaves to limit transpiration. 
D) opening of the stomata in the leaves to allow more carbon dioxide to enter. 
A) bending of the petioles on the leaves. 
B) closing of the stele in the roots. 
C) closing of the stomata in the leaves to limit transpiration. 
D) opening of the stomata in the leaves to allow more carbon dioxide to enter.

Question 8

The process by which water is "pulled" up through the xylem columns of plants as it evaporates out of the leaves is called

Accepted Answer

A) respiration. 
B) transpiration. 
C) osmosis. 
D) anhydration. 
A) respiration. 
B) transpiration. 
C) osmosis. 
D) anhydration.

Question 9

Water may be lost in the form of liquid from the surface of leaves through a process known as

Accepted Answer

A) guttation. 
B) cohesion. 
C) phloem loading. 
D) mesophyll adhesion. 
A) guttation. 
B) cohesion. 
C) phloem loading. 
D) mesophyll adhesion.

Question 10

Water moves through a plant by each of the following methods except

Accepted Answer

A) from cell to cell through plasmodesmata. 
B) through the Casparian strip. 
C) through the spaces between cells. 
D) through vessel members. 
A) from cell to cell through plasmodesmata. 
B) through the Casparian strip. 
C) through the spaces between cells. 
D) through vessel members.

Question 11

If the soil around a plant is treated with a fungicide, the plant may experience a decline in DNA synthesis.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following statements about transport through phloem is true?

Accepted Answer

A) Transport only occurs from the roots to the shoot. 
B) It is aided by root pressure. 
C) The direction of flow can change at different times if the sources and sinks change. 
D) No energy is required. 
A) Transport only occurs from the roots to the shoot. 
B) It is aided by root pressure. 
C) The direction of flow can change at different times if the sources and sinks change. 
D) No energy is required.

Question 13

Which of the following does not require expenditure of energy?

Accepted Answer

A) accumulation of ions inside a cell 
B) transport against a concentration gradient 
C) flow of sucrose and other carbohydrates once inside the sieve tubes 
D) the loading and unloading of carbohydrates from the sieve tubes 
A) accumulation of ions inside a cell 
B) transport against a concentration gradient 
C) flow of sucrose and other carbohydrates once inside the sieve tubes 
D) the loading and unloading of carbohydrates from the sieve tubes

Question 14

Which of the following hormones increases when plants are flooded?

Accepted Answer

A) gibberellin 
B) auxin 
C) ethylene 
D) cytokinin 
A) gibberellin 
B) auxin 
C) ethylene 
D) cytokinin

Question 15

Water molecules can "stick" to certain surfaces by

Accepted Answer

A) adhesion. 
B) cohesion. 
C) root pressure. 
D) water pressure. 
A) adhesion. 
B) cohesion. 
C) root pressure. 
D) water pressure.

Question 16

Most carbohydrates manufactured in leaves and other photosynthetic parts are transported through the phloem to the rest of the plant by the process of

Accepted Answer

A) transpiration. 
B) translocation. 
C) osmosis. 
D) receptor-mediated transport. 
A) transpiration. 
B) translocation. 
C) osmosis. 
D) receptor-mediated transport.

Question 17

Which of the following actions occurs in many plants when CO2 concentrations are high?

Accepted Answer

A) Guard cells lose turgor, and the stomata close. 
B) Water evaporates at a higher rate than usual. 
C) CAM photosynthesis fixes CO2 at night. 
D) Oxygen is used by plants for photosynthesis. 
A) Guard cells lose turgor, and the stomata close. 
B) Water evaporates at a higher rate than usual. 
C) CAM photosynthesis fixes CO2 at night. 
D) Oxygen is used by plants for photosynthesis.

Question 18

A decrease in the availability of ATP in a root cell could decrease the water potential of the cell.

Accepted Answer

A) True 
 B)False

Question 19

Some plants can tolerate flooding conditions by

Accepted Answer

A) formation of aerenchyma. 
B) opening their lenticels. 
C) forming additional adventitious roots. 
D) shedding their bark. 
A) formation of aerenchyma. 
B) opening their lenticels. 
C) forming additional adventitious roots. 
D) shedding their bark.

Question 20

In Cell 3,

Accepted Answer

A) $\Psi$p = 0.0 MPa and $\Psi$w = -0.5 MPa. 
B) $\Psi$p = 0.0 MPa and $\Psi$w = 0.0 MPa. 
C) $\Psi$p = +0.5 MPa and $\Psi$w = -0.5 MPa. 
D) $\Psi$p = -0.5 MPa and $\Psi$w = -0.5 MPa. 
A) $\Psi$p = 0.0 MPa and $\Psi$w = -0.5 MPa. 
B) $\Psi$p = 0.0 MPa and $\Psi$w = 0.0 MPa. 
C) $\Psi$p = +0.5 MPa and $\Psi$w = -0.5 MPa. 
D) $\Psi$p = -0.5 MPa and $\Psi$w = -0.5 MPa.

Exam 37: Transport in Plants

If a mutation decreased the radius of a xylem vessel threefold, there would be an 81-fold increase in the volume of liquid moving through the vessel.

Water is able to cross plant plasma membranes by a combination of

Closing the stomata for an extended period of time would lead to an increase in G3P in the mesophyll cells.

Most of the water absorbed by the plant enters through the

Which of the following statements does not apply to aquaporins?

Which of these situations regarding phloem sources and sinks is not correct?

On a short-term basis, water loss in plants may be controlled by the

The process by which water is "pulled" up through the xylem columns of plants as it evaporates out of the leaves is called

Water may be lost in the form of liquid from the surface of leaves through a process known as

Water moves through a plant by each of the following methods except

If the soil around a plant is treated with a fungicide, the plant may experience a decline in DNA synthesis.

Which of the following statements about transport through phloem is true?

Which of the following does not require expenditure of energy?

Which of the following hormones increases when plants are flooded?

Water molecules can "stick" to certain surfaces by

Most carbohydrates manufactured in leaves and other photosynthetic parts are transported through the phloem to the rest of the plant by the process of

Which of the following actions occurs in many plants when CO2 concentrations are high?

A decrease in the availability of ATP in a root cell could decrease the water potential of the cell.

Some plants can tolerate flooding conditions by

In Cell 3,

The Science of Biology

The Nature of Molecules and the Properties of Water

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, Phylogenies, and Comparative Biology

Genome Evolution

Evolution of Development

The Origin and Diversity of Life

Viruses

Prokaryotes

Protists

Seedless Plants

Seed Plants

Fungi

Animal Diversity and the Evolution of Body Plans

Protostomes

Deuterostomes

Plant Form

Plant Nutrition and Soils

Plant Defense Responses

Sensory Systems in Plants

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

Ecology of Individuals and Populations

Community Ecology

Dynamics of Ecosystems

The Biosphere

Conservation Biology

Filters

Which of the following actions occurs in many plants when CO₂ concentrations are high?