Question 1

Which of the following hormones promotes seed dormancy?

Accepted Answer

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

Question 2

Which of the following best describes the mechanism that causes stomata to open?

Accepted Answer

A)  Water accumulates below the opening and eventually causes the stoma to open. 
B)  A large bubble of oxygen accumulates below the stoma and eventually causes it to open. 
C)  Two guard cells flanking each stoma control its opening by changing shape. 
D)  The internal pressure of xylem sap expands the leaf, stretching the stoma open. 
A)  Water accumulates below the opening and eventually causes the stoma to open. 
B)  A large bubble of oxygen accumulates below the stoma and eventually causes it to open. 
C)  Two guard cells flanking each stoma control its opening by changing shape. 
D)  The internal pressure of xylem sap expands the leaf, stretching the stoma open.

Question 3

Which of the following hormones promotes cell division?

Accepted Answer

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

Question 4

Which of the following supplies water and minerals to a typical plant?

Accepted Answer

A)  the air 
B)  bacteria 
C)  sunlight 
D)  the soil 
A)  the air 
B)  bacteria 
C)  sunlight 
D)  the soil

Question 5

-A scientist finds seeds of an unknown plant on top of the soil in a desert.She measures the concentration of two hormones in these seeds.After it rains,she collects more of these seeds,and finds that the concentration of the two hormones has changed.A graph of her results is shown above.If the scientist returns to the desert to collect more seeds,a few days later,what should she observe?

Accepted Answer

A)  The seeds that are still in the desert will be dormant. 
B)  The seeds that are still in the desert will be germinating. 
C)  The seeds that are still in the desert will be dead. 
D)  The seeds that are still in the desert will have increased levels of hormones 1 and 2. 
A)  The seeds that are still in the desert will be dormant. 
B)  The seeds that are still in the desert will be germinating. 
C)  The seeds that are still in the desert will be dead. 
D)  The seeds that are still in the desert will have increased levels of hormones 1 and 2.

Question 6

Which of the following convert atmospheric nitrogen to ammonium?

Accepted Answer

A)  nitrifying bacteria 
B)  nitrogen-fixing bacteria 
C)  mycorrhizae 
D)  ammonifying bacteria 
A)  nitrifying bacteria 
B)  nitrogen-fixing bacteria 
C)  mycorrhizae 
D)  ammonifying bacteria

Question 7

The figure below shows plants originally grown in the dark,and then a light is added on one side only (arrow).Predict the response of the plants to the addition of the light source.

Accepted Answer

A)  Auxin becomes concentrated on the lighted side of the plants, and the plants begin to grow toward the light. 
B)  Auxin becomes concentrated on the darker side of the plants, and the plants begin to grow toward the light. 
C)  Auxin becomes concentrated on the lighted side of the plants, and the plants begin to grow away from the light. 
D)  Auxin becomes concentrated on the darker side of the plants, and the plants begin to grow away from the light. 
A)  Auxin becomes concentrated on the lighted side of the plants, and the plants begin to grow toward the light. 
B)  Auxin becomes concentrated on the darker side of the plants, and the plants begin to grow toward the light. 
C)  Auxin becomes concentrated on the lighted side of the plants, and the plants begin to grow away from the light. 
D)  Auxin becomes concentrated on the darker side of the plants, and the plants begin to grow away from the light.

Question 8

Oats are eaten by humans as oatmeal or rolled oats,and as feed for livestock such as cattle.In order for an oat plant to make the part we eat (the seed),it must flower and be pollinated.Typically,oat plants flower when days are lengthening (i.e.,late spring to early summer).What is the best classification for oat plants?

Accepted Answer

A)  long night 
B)  short night 
C)  night neutral 
D)  short day 
A)  long night 
B)  short night 
C)  night neutral 
D)  short day

Question 9

Which of the following explains how phloem sap moves within a plant?

Accepted Answer

A)  cohesion-tension mechanism 
B)  gravity pulls the phloem sap down 
C)  pressure-flow mechanism 
D)  transpiration 
A)  cohesion-tension mechanism 
B)  gravity pulls the phloem sap down 
C)  pressure-flow mechanism 
D)  transpiration

Question 10

Transpiration pulls water up a plant because of two mechanisms: ________ describes water molecules sticking together and ________ describes water molecules sticking to the walls of the xylem.

Accepted Answer

A)  cohesion... adhesion 
B)  adhesion... cohesion 
C)  adhesion... gravity 
D)  gravity... cohesion 
A)  cohesion... adhesion 
B)  adhesion... cohesion 
C)  adhesion... gravity 
D)  gravity... cohesion

Question 11

Which of the following hormones promotes fruit ripening and dropping of leaves?

Accepted Answer

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

Question 12

Which of the following best describes night-neutral plants?

Accepted Answer

A)  The plants flower at night. 
B)  Plants tend to flower when nights become longer. 
C)  Plants tend to flower when nights become shorter. 
D)  The flowering in these plants is not affected by photoperiod. 
A)  The plants flower at night. 
B)  Plants tend to flower when nights become longer. 
C)  Plants tend to flower when nights become shorter. 
D)  The flowering in these plants is not affected by photoperiod.

Question 13

Trace the flow of a water molecule that is used during photosynthesis.

Accepted Answer

A)  stoma → xylem → root hair → mycorrhiza 
B)  soil → root hair → xylem → stoma → atmosphere 
C)  soil → root hair → xylem → leaf cell 
D)  soil → xylem → leaf cell → atmosphere 
A)  stoma → xylem → root hair → mycorrhiza 
B)  soil → root hair → xylem → stoma → atmosphere 
C)  soil → root hair → xylem → leaf cell 
D)  soil → xylem → leaf cell → atmosphere

Question 14

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ________,and ________ near root storage cells.

Accepted Answer

A)  high… high 
B)  high… low 
C)  low… low 
D)  low… high 
A)  high… high 
B)  high… low 
C)  low… low 
D)  low… high

Question 15

Which of the following best describe(s)the dependencies of most flowering plants? I)Many depend on insects or other animals for pollination.
II)Many depend on insects or other animals for seed dispersal.
III)Many depend on fungi to help them acquire nutrients.

Accepted Answer

A)  I 
B)  II 
C)  I and III 
D)  I, II, and III 
A)  I 
B)  II 
C)  I and III 
D)  I, II, and III

Question 16

Which of the following BEST describes the essential difference between plant and animal nutrition?

Accepted Answer

A)  Plants use inorganic substances and energy from the sun to produce their own food. 
B)  Plants use organic substances to produce their own food. 
C)  Plants absorb food through their roots. 
D)  Plant and animal nutrition are essentially the same. 
A)  Plants use inorganic substances and energy from the sun to produce their own food. 
B)  Plants use organic substances to produce their own food. 
C)  Plants absorb food through their roots. 
D)  Plant and animal nutrition are essentially the same.

Question 17

Which of the following best describes the opening and closing of the stomata in most plants?

Accepted Answer

A)  They are open during the day and closed at night. 
B)  They are open at night and closed during the day. 
C)  They are open almost all of the time. 
D)  They are closed except for brief periods of time during the day. 
A)  They are open during the day and closed at night. 
B)  They are open at night and closed during the day. 
C)  They are open almost all of the time. 
D)  They are closed except for brief periods of time during the day.

Exam 29: The Working Plant

Which of the following hormones promotes seed dormancy?

Which of the following best describes the mechanism that causes stomata to open?

Which of the following hormones promotes cell division?

Which of the following supplies water and minerals to a typical plant?

Which of the following convert atmospheric nitrogen to ammonium?

The figure below shows plants originally grown in the dark,and then a light is added on one side only (arrow).Predict the response of the plants to the addition of the light source.

Which of the following explains how phloem sap moves within a plant?

Transpiration pulls water up a plant because of two mechanisms: ________ describes water molecules sticking together and ________ describes water molecules sticking to the walls of the xylem.

Which of the following hormones promotes fruit ripening and dropping of leaves?

Which of the following best describes night-neutral plants?

Trace the flow of a water molecule that is used during photosynthesis.

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ________,and ________ near root storage cells.

Which of the following best describe(s)the dependencies of most flowering plants? I)Many depend on insects or other animals for pollination. II)Many depend on insects or other animals for seed dispersal. III)Many depend on fungi to help them acquire nutrients.

Which of the following BEST describes the essential difference between plant and animal nutrition?

Which of the following best describes the opening and closing of the stomata in most plants?

Introduction: Biology Today

Essential Chemistry for Biology

The Molecules of Life

A Tour of the Cell

The Working Cell

Cellular Respiration: Obtaining Energy from Food

Photosynthesis: Using Light to Make Food

Cellular Reproduction: Cells from Cells

Patterns of Inheritance

The Structure and Function of DNA

How Genes Are Controlled

DNA Technology

How Populations Evolve

How Biological Diversity Evolves

The Evolution of Microbial Life

The Evolution of Plants and Fungi

The Evolution of Animals

An Introduction to Ecology and the Biosphere

Population Ecology

Communities and Ecosystems

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Circulation and Respiration

The Body's Defenses

Hormones

Reproduction and Development

Nervous, Sensory, and Locomotor Systems

The Life of a Flowering Plant

Filters

Transpiration pulls water up a plant because of two mechanisms: describes water molecules sticking together and describes water molecules sticking to the walls of the xylem.

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ,and near root storage cells.