Question 1

Which of the following watering regimens will be most effective at keeping a lawn green during the hot, dry summer months?

Accepted Answer

A) daily sprinkling to soak the soil to 0.5 inch 
B) sprinkling every other day to soak the soil to 1.0 inch 
C) sprinkling every third day to soak the soil to 2.0 inches 
D) A or B would be equally effective. 
E) A, B or C would be equally effective. 
A) daily sprinkling to soak the soil to 0.5 inch 
B) sprinkling every other day to soak the soil to 1.0 inch 
C) sprinkling every third day to soak the soil to 2.0 inches 
D) A or B would be equally effective. 
E) A, B or C would be equally effective.

Question 2

If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?

Accepted Answer

A) CO2 
B) cytokinins 
C) ethylene 
D) auxin 
E) gibberellic acids 
A) CO2 
B) cytokinins 
C) ethylene 
D) auxin 
E) gibberellic acids

Question 3

Plant hormones produce their effects by

Accepted Answer

A) altering the expression of genes. 
B) modifying the permeability of the plasma membrane. 
C) modifying the structure of the nuclear envelope membrane. 
D) both A and B 
E) B and C only 
A) altering the expression of genes. 
B) modifying the permeability of the plasma membrane. 
C) modifying the structure of the nuclear envelope membrane. 
D) both A and B 
E) B and C only

Question 4

We tend to think of plants as immobile when, in fact, they can move in many ways. All of the following are movements plants can accomplish except

Accepted Answer

A) growth movements up or down in response to gravity. 
B) folding and unfolding of leaves using muscle-like tissues. 
C) growth movements toward or away from light. 
D) changes in plant growth form in response to wind or touch. 
E) rapid responses using action potentials similar to those found in the nervous tissue of animals. 
A) growth movements up or down in response to gravity. 
B) folding and unfolding of leaves using muscle-like tissues. 
C) growth movements toward or away from light. 
D) changes in plant growth form in response to wind or touch. 
E) rapid responses using action potentials similar to those found in the nervous tissue of animals.

Question 5

The chemical signal for flowering could be released earlier than normal in a long-day plant exposed to flashes of

Accepted Answer

A) far-red light during the night. 
B) red light during the night. 
C) red light followed by far-red light during the night. 
D) far-red light during the day. 
E) red light during the day. 
A) far-red light during the night. 
B) red light during the night. 
C) red light followed by far-red light during the night. 
D) far-red light during the day. 
E) red light during the day.

Question 6

Both red and blue light are involved in

Accepted Answer

A) stem elongation. 
B) photoperiodism. 
C) positive phototropism. 
D) tracking seasons. 
E) all of the above 
A) stem elongation. 
B) photoperiodism. 
C) positive phototropism. 
D) tracking seasons. 
E) all of the above

Question 7

Auxin triggers the acidification of cell walls that results in rapid growth, but also stimulates sustained, long-term cell elongation. What best explains how auxin brings about this dual growth response?

Accepted Answer

A) Auxin binds to different receptors in different cells. 
B) Different concentrations of auxin have different effects. 
C) Auxin causes second messengers to activate both proton pumps and certain genes. 
D) The dual effects are due to two different auxins. 
E) Other antagonistic hormones modify auxin's effects. 
A) Auxin binds to different receptors in different cells. 
B) Different concentrations of auxin have different effects. 
C) Auxin causes second messengers to activate both proton pumps and certain genes. 
D) The dual effects are due to two different auxins. 
E) Other antagonistic hormones modify auxin's effects.

Question 8

Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the

Accepted Answer

A) tip of the coleoptile. 
B) part of the coleoptile that bends during the response. 
C) base of the coleoptile. 
D) cotyledon. 
E) phytochrome in the leaves. 
A) tip of the coleoptile. 
B) part of the coleoptile that bends during the response. 
C) base of the coleoptile. 
D) cotyledon. 
E) phytochrome in the leaves.

Question 9

This experiment suggests that the unknown amount of gibberellin in the experimental plant (B)is approximately

Accepted Answer

A) zero. 
B) 0.01 μg/mL. 
C) 0.1 μg/mL. 
D) 1.0 μg/mL. 
E) equal to the amount of gibberellin in the shortest plant. 
A) zero. 
B) 0.01 μg/mL. 
C) 0.1 μg/mL. 
D) 1.0 μg/mL. 
E) equal to the amount of gibberellin in the shortest plant.

Question 10

Evidence for phototropism due to the asymmetric distribution of auxin moving down the stem

Accepted Answer

A) has not been found in eudicots such as sunflower and radish. 
B) has been found in all monocots and most eudicots. 
C) has been shown to involve only IAA stimulation of cell elongation on the dark side of the stem. 
D) can be demonstrated with unilateral red light, but not blue light. 
E) is now thought by most plant scientists not to involve the shoot tip. 
A) has not been found in eudicots such as sunflower and radish. 
B) has been found in all monocots and most eudicots. 
C) has been shown to involve only IAA stimulation of cell elongation on the dark side of the stem. 
D) can be demonstrated with unilateral red light, but not blue light. 
E) is now thought by most plant scientists not to involve the shoot tip.

Question 11

How does indoleacetic acid affect fruit development?

Accepted Answer

A) preventing pollination 
B) inhibiting formation of the ovule 
C) promoting gene expression in cambial tissue 
D) promoting rapid growth of the ovary 
E) inducing the formation of brassinosteroids 
A) preventing pollination 
B) inhibiting formation of the ovule 
C) promoting gene expression in cambial tissue 
D) promoting rapid growth of the ovary 
E) inducing the formation of brassinosteroids

Exam 39: Plant Responses to Internal and External Signals

Which of the following watering regimens will be most effective at keeping a lawn green during the hot, dry summer months?

If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?

Plant hormones produce their effects by

We tend to think of plants as immobile when, in fact, they can move in many ways. All of the following are movements plants can accomplish except

The chemical signal for flowering could be released earlier than normal in a long-day plant exposed to flashes of

Both red and blue light are involved in

Auxin triggers the acidification of cell walls that results in rapid growth, but also stimulates sustained, long-term cell elongation. What best explains how auxin brings about this dual growth response?

Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the

This experiment suggests that the unknown amount of gibberellin in the experimental plant (B)is approximately

Evidence for phototropism due to the asymmetric distribution of auxin moving down the stem

How does indoleacetic acid affect fruit development?

Introduction: Themes in the Study of Life

The Chemical Context of Life

Water and the Fitness of the Environment

Carbon and the Molecular Diversity of Life

The Structure and Function of Large Biological Molecules

A Tour of the Cell

Membrane Structure and Function

An Introduction to Metabolism

Cellular Respiration: Harvesting Chemical Energy

Photosynthesis

Cell Communication

The Cell Cycle

Meiosis and Sexual Life Cycles

Mendel and the Gene Idea

The Chromosomal Basis of Inheritance

The Molecular Basis of Inheritance

From Gene to Protein

Control of Gene Expression

Viruses

Biotechnology

Genomes and Their Evolution

Descent With Modification: a Darwinian View of Life

The Evolution of Populations

The Origin of Species

The History of Life on Earth

Phylogeny and the Tree of Life

Bacteria and Archaea

Protists

Plant Diversity I: How Plants Colonized Land

Plant Diversity Ii: the Evolution of Seed Plants

Fungi

An Introduction to Animal Diversity

Invertebrates

Vertebrates

Plant Structure, Growth, and Development

Transport in Vascular Plants

Soil and Plant Nutrition

Angiosperm Reproduction and Biotechnology

Basic Principles of Animal Form and Function

Animal Nutrition

Circulation and Gas Exchange

The Immune System

Osmoregulation and Excretion

Hormones and the Endocrine System

Animal Reproduction

Animal Development

Neurons, Synapses, and Signaling

Nervous Systems

Sensory and Motor Mechanisms

Animal Behavior

An Introduction to Ecology and the Biosphere

Population Ecology

Community Ecology

Ecosystems

Conservation Biology and Restoration Ecology

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