Question 1

The Chaetognaths

Accepted Answer

A)  have radial symmetry. 
B)  feed on clams. 
C)  are small ancestors of fish. 
D)  are mostly pelagic plankton feeders. 
E)  are solidly advanced deuterostomes. 
A)  have radial symmetry. 
B)  feed on clams. 
C)  are small ancestors of fish. 
D)  are mostly pelagic plankton feeders. 
E)  are solidly advanced deuterostomes.

Question 2

How do the tube feet of sea stars and sea urchins operate?

Accepted Answer

A)  Sticky threads lead back to the mouth and primitive brain 
B)  Cilia transport hemolymph from chamber to chamber 
C)  Actin and myosin in muscles in the five arms or "rays" constrict the tube feet directly when stimulated by nerves from the sea star brain 
D)  A hydraulic system regulates water pressure in the tube feet 
E)  Each tube foot is an independent organism and the sea star is a colonial mass 
A)  Sticky threads lead back to the mouth and primitive brain 
B)  Cilia transport hemolymph from chamber to chamber 
C)  Actin and myosin in muscles in the five arms or "rays" constrict the tube feet directly when stimulated by nerves from the sea star brain 
D)  A hydraulic system regulates water pressure in the tube feet 
E)  Each tube foot is an independent organism and the sea star is a colonial mass

Question 3

Tube feet run along the ___________ groove that extends along the oral side from the mouth to the tip of each arm.

Accepted Answer

A)  Ambulacral. 
B)  Hemal. 
C)  Radial. 
D)  Dermal. 
E)  Lateral. 
A)  Ambulacral. 
B)  Hemal. 
C)  Radial. 
D)  Dermal. 
E)  Lateral.

Question 4

On the inner end of each tube foot is a muscular sac called an ______________.

Accepted Answer

The answer of On the inner end of each tube...

Question 5

The ________________ live in secreted tubes on the ocean bottom.

Accepted Answer

The answer of The ________________ live in secreted tubes on...

Question 6

These odd little echinoderms were formerly considered a class of their own.They possess tube feet distributed around the periphery of their disclike body and belong to the group ___________.

Accepted Answer

The answer of These odd little echinoderms were formerly considered...

Question 7

Arrow-worms feed

Accepted Answer

A)  on plankton and small fish. 
B)  by retracting a hood and snapping onto food items. 
C)  by surfacing at night and drifting transparently among plankton. 
D)  All of the choices are correct. 
E)  None of the choices are correct. 
A)  on plankton and small fish. 
B)  by retracting a hood and snapping onto food items. 
C)  by surfacing at night and drifting transparently among plankton. 
D)  All of the choices are correct. 
E)  None of the choices are correct.

Exam 22: Chaetognaths, Echinoderms, and Hemichordates

The Chaetognaths

How do the tube feet of sea stars and sea urchins operate?

Tube feet run along the ___________ groove that extends along the oral side from the mouth to the tip of each arm.

On the inner end of each tube foot is a muscular sac called an ______________.

The ________________ live in secreted tubes on the ocean bottom.

These odd little echinoderms were formerly considered a class of their own.They possess tube feet distributed around the periphery of their disclike body and belong to the group ___________.

Arrow-worms feed

Life: Biological Principles and the Science of Zoology

The Origin and Chemistry of Life

Cells As Units of Life

Cellular Metabolism

Genetics: a Review

Organic Evolution

The Reproductive Process

Principles of Development

Architectural Pattern of an Animal

Taxonomy and Phylogeny of Animals

Unicellular Eukaryotes

Sponges and Placozoans

Radiate Animals

Acoelomorpha,Platyzoa,and Mesozoa

Polyzoa and Kryptrochozoa

Molluscs

Annelids and Allied Taxa

Smaller Ecdysozoans

Trilobites, Chelicerates, and Myriapods

Crustaceans

Support, Protection, and Movement

Chordates

Fishes

Early Tetrapods and Modern Amphibians

Amniote Origins and Nonavian Reptiles

Birds

Mammals

Support, protection, and Movement

Homeostasis: Osmotic Regulation, Excretion, and Temperature Regulation

Homeostasis: Internal Fluids and Respiration

Digestion and Nutrition

Nervous Coordination: Nervous System and Sense Organs

Chemical Coordination: Endocrine System

Immunity

Animal Behavior

Animal Distributions

Animal Ecology

Filters