Question 1

What drives the process of transpiration?

Accepted Answer

A) upward pressure as sugar is forced into the roots 
B) evaporation 
C) pumping by the xylem cells 
D) passive transport 
A) upward pressure as sugar is forced into the roots 
B) evaporation 
C) pumping by the xylem cells 
D) passive transport

Question 2

What generally causes stomata to open?

Accepted Answer

A) the release of abscisic acid by the roots 
B) a drop in CO2 concentration in leaf air spaces 
C) an exposure to red light 
D) a drop in O2 concentration in leaf air spaces 
A) the release of abscisic acid by the roots 
B) a drop in CO2 concentration in leaf air spaces 
C) an exposure to red light 
D) a drop in O2 concentration in leaf air spaces

Question 3

Which of the following best describes the process by which individual plant cells typically gain or lose water?

Accepted Answer

A) symport 
B) guttation 
C) osmosis 
D) facilitated diffusion 
A) symport 
B) guttation 
C) osmosis 
D) facilitated diffusion

Question 4

Which plant organelle stores solutes and plays a major role in maintaining turgor pressure?

Accepted Answer

A) chloroplast 
B) mitochondrion 
C) vacuole 
D) cell wall 
A) chloroplast 
B) mitochondrion 
C) vacuole 
D) cell wall

Question 5

How do companion cells load most of the carbohydrates into sieve tube members?

Accepted Answer

A) by symport 
B) through carrier proteins 
C) through plasmodesmata 
D) by antiport 
A) by symport 
B) through carrier proteins 
C) through plasmodesmata 
D) by antiport

Question 6

Explain the process that occurs when a stoma goes from closed to open.

Accepted Answer

When triggered by items such as blue lig

Question 7

What is the ψP of a living plant cell that has ψ = -0.2 MPa and ψS = -0.4 MPa?

Accepted Answer

A) ψP = -0.6 MPa 
B) ψP = 0.08 MPa0 
C) ψP = 0.2 MPa 
D) ψP = 0.5 MPa 
A) ψP = -0.6 MPa 
B) ψP = 0.08 MPa0 
C) ψP = 0.2 MPa 
D) ψP = 0.5 MPa

Question 8

Suppose two living plant cells are in contact with each other such that water, but NOT solutes, can pass between them. Also suppose that the cells have the same water potential, and that one cell has ψP = 0.3 MPa and ψS = -0.5 MPa, while the other cell has ψS = -0.3 MPa. What is the ψP of the second cell?

Accepted Answer

A) ψP = -0.8 MPa 
B) ψP = 0.1 MPa 
C) ψP = 0.5 MPa 
D) ψP = 0.8 MPa 
A) ψP = -0.8 MPa 
B) ψP = 0.1 MPa 
C) ψP = 0.5 MPa 
D) ψP = 0.8 MPa

Question 9

Under which conditions would essentially no transpiration be expected to occur?

Accepted Answer

A) near freezing air temperature 
B) hot air temperature and no winds 
C) brisk winds 
D) 100% relative humidity 
A) near freezing air temperature 
B) hot air temperature and no winds 
C) brisk winds 
D) 100% relative humidity

Question 10

Which sentence best describes how mineral ions are absorbed by plants?

Accepted Answer

A) They are moved into the symplast via facilitated diffusion. 
B) They are moved into the apoplast via bulk flow. 
C) They are moved into the symplast via active transport. 
D) They are moved into the apoplast via facilitated diffusion. 
A) They are moved into the symplast via facilitated diffusion. 
B) They are moved into the apoplast via bulk flow. 
C) They are moved into the symplast via active transport. 
D) They are moved into the apoplast via facilitated diffusion.

Question 11

Suppose you discover a mutant plant that CANNOT actively transport solutes across the tonoplast. How will this plant differ from a wild-type plant?

Accepted Answer

A) The plant will generally be like a normal plant. 
B) The plant will wilt easily. 
C) The plant will not have roots. 
D) The plant will not have leaves. 
A) The plant will generally be like a normal plant. 
B) The plant will wilt easily. 
C) The plant will not have roots. 
D) The plant will not have leaves.

Question 12

What does tonoplast refer to?

Accepted Answer

A) the plant nuclear envelope 
B) the cell wall 
C) a chloroplast 
D) the vacuolar membrane 
A) the plant nuclear envelope 
B) the cell wall 
C) a chloroplast 
D) the vacuolar membrane

Question 13

Match each term or phrase with the letter of the associated plant tissue. Each letter may be used once, more than once, or not at all.
-cohesion-tension mechanism

Accepted Answer

A) xylem 
B) phloem 
C) both xylem and phloem 
D) neither xylem nor phloem 
A) xylem 
B) phloem 
C) both xylem and phloem 
D) neither xylem nor phloem

Question 14

Which term best describes the movement of NH4+ ions into a cell down an electrochemical gradient?

Accepted Answer

A) a symport 
B) passive diffusion 
C) facilitated diffusion 
D) active transport 
A) a symport 
B) passive diffusion 
C) facilitated diffusion 
D) active transport

Question 15

How far are most leaf cells from a xylem vein?

Accepted Answer

A) 2.0 centimetres 
B) 1.0 centimetre 
C) 0.5 millimetres 
D) 50 micrometres 
A) 2.0 centimetres 
B) 1.0 centimetre 
C) 0.5 millimetres 
D) 50 micrometres

Question 16

Match each term or phrase with the letter of the associated plant tissue. Each letter may be used once, more than once, or not at all.
-companion cells

Accepted Answer

A) xylem 
B) phloem 
C) both xylem and phloem 
D) neither xylem nor phloem 
A) xylem 
B) phloem 
C) both xylem and phloem 
D) neither xylem nor phloem

Question 17

When solutes are unloaded from phloem, what happens to water?

Accepted Answer

A) It is pumped out of the phloem by active transport. 
B) It is pumped into the phloem by active transport. 
C) It leaves the xylem by osmosis. 
D) It leaves the phloem by osmosis. 
A) It is pumped out of the phloem by active transport. 
B) It is pumped into the phloem by active transport. 
C) It leaves the xylem by osmosis. 
D) It leaves the phloem by osmosis.

Question 18

Which of the following best describes the mechanism(s) by which water can move inside a root?

Accepted Answer

A) apoplastic, transmembrane, and symplastic pathways 
B) transmembrane and symplastic pathways 
C) transmembrane pathway 
D) apoplastic pathway 
A) apoplastic, transmembrane, and symplastic pathways 
B) transmembrane and symplastic pathways 
C) transmembrane pathway 
D) apoplastic pathway

Question 19

Suppose that a living plant cell is placed in a beaker with pure water. How long will it take up water?

Accepted Answer

A) until it is flaccid 
B) until it is turgid 
C) until it is shrunken 
D) until it is plasmolysed 
A) until it is flaccid 
B) until it is turgid 
C) until it is shrunken 
D) until it is plasmolysed

Question 20

Suppose a living plant cell has ψ = ψS = -0.5 MPa. Also suppose that the plant cell is placed into a beaker filled with a solution for which ψ = 0. What will the cell then do?

Accepted Answer

A) It will lose water until its ψS = its ψP. 
B) It will take up water until within the cell ψP = -ψS. 
C) It will take up water until its ψS = ψS of the solution. 
D) It will take up water until it bursts. 
A) It will lose water until its ψS = its ψP. 
B) It will take up water until within the cell ψP = -ψS. 
C) It will take up water until its ψS = ψS of the solution. 
D) It will take up water until it bursts.

Exam 35: Transport in Plants

What drives the process of transpiration?

What generally causes stomata to open?

Which of the following best describes the process by which individual plant cells typically gain or lose water?

Which plant organelle stores solutes and plays a major role in maintaining turgor pressure?

How do companion cells load most of the carbohydrates into sieve tube members?

Explain the process that occurs when a stoma goes from closed to open.

What is the ψP of a living plant cell that has ψ = -0.2 MPa and ψS = -0.4 MPa?

Under which conditions would essentially no transpiration be expected to occur?

Which sentence best describes how mineral ions are absorbed by plants?

Suppose you discover a mutant plant that CANNOT actively transport solutes across the tonoplast. How will this plant differ from a wild-type plant?

What does tonoplast refer to?

Match each term or phrase with the letter of the associated plant tissue. Each letter may be used once, more than once, or not at all. -cohesion-tension mechanism

Which term best describes the movement of NH4+ ions into a cell down an electrochemical gradient?

How far are most leaf cells from a xylem vein?

Match each term or phrase with the letter of the associated plant tissue. Each letter may be used once, more than once, or not at all. -companion cells

When solutes are unloaded from phloem, what happens to water?

Which of the following best describes the mechanism(s) by which water can move inside a root?

Suppose that a living plant cell is placed in a beaker with pure water. How long will it take up water?

Suppose a living plant cell has ψ = ψS = -0.5 MPa. Also suppose that the plant cell is placed into a beaker filled with a solution for which ψ = 0. What will the cell then do?

Light and Life

The Cell: an Overview

Defining Life and Its Origins

Energy and Enzymes

Cell Membranes and Signalling

Cellular Respiration

Photosynthesis

Cell Cycles

Genetic Recombination

Mendel, Genes, and Inheritance

Genes, Chromosomes, and Human Genetics

Dna Structure, Replication, and Organization

Gene Structure and Expression

Control of Gene Expression

Dna Technologies

Genomes and Proteomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Species and Macroevolution

Understanding the History of Life on Earth

Humans and Evolution

Bacteria and Archaea

Viruses, Viroids, and Prions: Infectious Biological Particles

Protists

Fungi

Plants

Diversity of Animals 1: Sponges, Radiata, Platyhelminthes, and Protostomes

Diversity of Animals 2: Deuterostomes: Vertebrates and Their Closest Relatives

Population Ecology

Population Interactions and Community Ecology

Ecosystems

Conservation of Biodiversity

Putting Selection to Work

Organization of the Plant Body

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Transport in Animals: the Circulatory System

Reproduction in Animals

Animal Development

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Integration

Muscles, Skeletons, and Body Movements

Animal Behaviour

Animal Nutrition

Gas Exchange: the Respiratory System

Regulating the Internal Environment

Defences Against Disease

Conservation and Evolutionary Physiology

Filters

What is the ψ_P of a living plant cell that has ψ = -0.2 MPa and ψ_S = -0.4 MPa?

Which term best describes the movement of NH₄⁺ ions into a cell down an electrochemical gradient?

Suppose a living plant cell has ψ = ψ_S = -0.5 MPa. Also suppose that the plant cell is placed into a beaker filled with a solution for which ψ = 0. What will the cell then do?