Question 1

The phytochrome Pr:

Accepted Answer

A) is very unstable. 
B) is the active form of Pfr. 
C) appears blue in solution. 
D) absorbs far-red light. 
A) is very unstable. 
B) is the active form of Pfr. 
C) appears blue in solution. 
D) absorbs far-red light.

Question 2

Which pigment is responsible for the phototropism responses of plants?

Accepted Answer

A) chlorophyll 
B) phytochrome 
C) auxin 
D) xanthophyll 
E) ethylene 
A) chlorophyll 
B) phytochrome 
C) auxin 
D) xanthophyll 
E) ethylene

Question 3

If you were running a tree nursery and wanted to keep your trees dormant until the customer could plant them, which hormone would you spray on the trees?

Accepted Answer

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

Question 4

After seeds were planted, some of the seedlings did not emerge from the soil. Is it possible that this is because some of the seeds were planted upside down?

Accepted Answer

A) Yes; if the seed was oriented so that the embryonic shoot pointed down, it would grow in that direction because sunlight doesn't reach it. 
B) Yes; after seeds are planted, water and settling of the soil may cause them to shift in their orientation. 
C) No; auxins in the shoots cause curvature away from gravity. 
D) No; sunlight penetrates soil to the depth of seeds and shoots grow toward the sunlight. 
E) No; gibberellins and abscisic acid, in balanced concentrations, cause shoots to grow away from gravity. 
A) Yes; if the seed was oriented so that the embryonic shoot pointed down, it would grow in that direction because sunlight doesn't reach it. 
B) Yes; after seeds are planted, water and settling of the soil may cause them to shift in their orientation. 
C) No; auxins in the shoots cause curvature away from gravity. 
D) No; sunlight penetrates soil to the depth of seeds and shoots grow toward the sunlight. 
E) No; gibberellins and abscisic acid, in balanced concentrations, cause shoots to grow away from gravity.

Question 5

When a peach blossom is pollinated, auxin and/or ________ stimulates the development of fruit from the ovary.

Accepted Answer

The answer of When a peach blossom is pollinated, auxin...

Question 6

Leaves of the Venus fly trap and other sensitive plants move quickly due to:

Accepted Answer

A) reduced permeability to potassium ions. 
B) muscle-like plant cells called myophytes. 
C) hormones that cause plant cell movement. 
D) an electrical stimulus and rapid diffusion of ions. 
A) reduced permeability to potassium ions. 
B) muscle-like plant cells called myophytes. 
C) hormones that cause plant cell movement. 
D) an electrical stimulus and rapid diffusion of ions.

Question 7

A new type of strawberry plant produces fruit in the late spring, throughout the summer, and into the fall. It is a(n)________ plant.

Accepted Answer

A) day-neutral 
B) long-day 
C) short-day 
D) indeterminate-day 
E) night-determinate 
A) day-neutral 
B) long-day 
C) short-day 
D) indeterminate-day 
E) night-determinate

Exam 45: Plant Responses to the Environment

The phytochrome Pr:

Which pigment is responsible for the phototropism responses of plants?

If you were running a tree nursery and wanted to keep your trees dormant until the customer could plant them, which hormone would you spray on the trees?

After seeds were planted, some of the seedlings did not emerge from the soil. Is it possible that this is because some of the seeds were planted upside down?

When a peach blossom is pollinated, auxin and/or ________ stimulates the development of fruit from the ovary.

Leaves of the Venus fly trap and other sensitive plants move quickly due to:

A new type of strawberry plant produces fruit in the late spring, throughout the summer, and into the fall. It is a(n)________ plant.

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

The Continuity of Life: Cellular Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amidst Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity Ii: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

How Do Ecosystems Work

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

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