Question 1

The phoronid circulatory system:

Accepted Answer

A) is a closed system but lacks a heart. 
B) has hemoglobin dissolved in the plasma. 
C) is an open system with pulsatile organs circulating the hemolymph. 
D) is an open system with no heart and is dependent upon the hemoglobin enclosed in nucleated cells. 
E) is missing and all food and wastes readily diffuse through the lophophore. 
A) is a closed system but lacks a heart. 
B) has hemoglobin dissolved in the plasma. 
C) is an open system with pulsatile organs circulating the hemolymph. 
D) is an open system with no heart and is dependent upon the hemoglobin enclosed in nucleated cells. 
E) is missing and all food and wastes readily diffuse through the lophophore.

Question 2

The coelom of a lophophorate is divided into

Accepted Answer

A) two parts: the anteriocoel and posteriocoel. 
B) three parts: the protocoel,mesocoel,and metacoel. 
C) four parts: the left and right supracoel and subcoel. 
D) two parts: the basicoel and the exterocoel extending into the tentacles. 
E) a interior hypocoel and a surrounding pericoel. 
A) two parts: the anteriocoel and posteriocoel. 
B) three parts: the protocoel,mesocoel,and metacoel. 
C) four parts: the left and right supracoel and subcoel. 
D) two parts: the basicoel and the exterocoel extending into the tentacles. 
E) a interior hypocoel and a surrounding pericoel.

Question 3

The chamber in which each zooid of an ectoproct colony lives is called a ________________.

Accepted Answer

The answer of The chamber in which each zooid of...

Question 4

Which is NOT a correct description of the function of the phoronid lophophore?

Accepted Answer

A) It can be extended for feeding and completely withdrawn for protection 
B) The mouth lies between the two ridges of the lophophore 
C) Each ridge of a lophophore has hollow ciliated tentacles that are extensions of the body wall 
D) Cilia on the tentacles direct the water current down the ridges and toward the mouth 
E) All of the choices are correct 
A) It can be extended for feeding and completely withdrawn for protection 
B) The mouth lies between the two ridges of the lophophore 
C) Each ridge of a lophophore has hollow ciliated tentacles that are extensions of the body wall 
D) Cilia on the tentacles direct the water current down the ridges and toward the mouth 
E) All of the choices are correct

Question 5

A lophophorate phylum that is primarily marine,but also has some freshwater members is ____________ (Bryozoa).

Accepted Answer

The answer of A lophophorate phylum that is primarily marine,but...

Question 6

Reproduction and development in phoronid worms involves

Accepted Answer

A) monoecious species. 
B) dioecious species. 
C) asexual species. 
D) a radial cleavage pattern. 
E) All of the choices are correct 
A) monoecious species. 
B) dioecious species. 
C) asexual species. 
D) a radial cleavage pattern. 
E) All of the choices are correct

Question 7

Which phyla are included in the Clade Krytrochozoa? Check all that apply.
____ Nemertea
____ Brachiopoda
____ Phoronida
_____ Ectoprocta

Accepted Answer

__X__ Nemertea
__X__

Question 8

How can you distinguish an ectoproct from a hydroid?

Accepted Answer

A) The hydroid colony is very small,perhaps a few millimeters long,while the ectoproct is centimeters long 
B) The hydroid has the anus within the tentacular crown and the ectoproct has the anus outside the crown 
C) The hydroid lacks any complex digestive gut including any anus 
D) The hydroid has more complex musculature and innervation 
E) Only hydroids form moss-like colonies 
A) The hydroid colony is very small,perhaps a few millimeters long,while the ectoproct is centimeters long 
B) The hydroid has the anus within the tentacular crown and the ectoproct has the anus outside the crown 
C) The hydroid lacks any complex digestive gut including any anus 
D) The hydroid has more complex musculature and innervation 
E) Only hydroids form moss-like colonies

Question 9

Why are these groups with diverse lifestyles (some with shells and some without,some colonial and some solitary,etc. )considered together? Be sure to list the structures and behaviors they have in common and discuss their evolutionary relationships.

Accepted Answer

These groups with diverse lifestyles are

Question 10

Which group is so specialized that they are only found on the mouth parts of marine decapods in the northern hemisphere?

Accepted Answer

A) micrognathozoans. 
B) rotifers. 
C) cycliophorans. 
D) acanthocephalans. 
E) entoprocts. 
A) micrognathozoans. 
B) rotifers. 
C) cycliophorans. 
D) acanthocephalans. 
E) entoprocts.

Question 11

The fossil record of brachiopods shows

Accepted Answer

A) they have only recently branched off from molluscan bivalves. 
B) they have existed nearly unchanged in design since the Ordovician times. 
C) they have evolved rapidly to displace many molluscs. 
D) they have never been common and are now going extinct. 
E) they are now much bigger than they were in earlier times. 
A) they have only recently branched off from molluscan bivalves. 
B) they have existed nearly unchanged in design since the Ordovician times. 
C) they have evolved rapidly to displace many molluscs. 
D) they have never been common and are now going extinct. 
E) they are now much bigger than they were in earlier times.

Question 12

Entoprocts

Accepted Answer

A) are mostly freshwater. 
B) are wormlike. 
C) have an incomplete digestive tract. 
D) have a crown of ciliated tentacles. 
E) are a major disease agent. 
A) are mostly freshwater. 
B) are wormlike. 
C) have an incomplete digestive tract. 
D) have a crown of ciliated tentacles. 
E) are a major disease agent.

Question 13

Colonies of Ectoprocts begin from a single zooid called an _____________.

Accepted Answer

The answer of Colonies of Ectoprocts begin from a single...

Question 14

The digestive system of a phoronid worm has

Accepted Answer

A) cilia in the stomach area of the U-shaped gut. 
B) water passing over the anus and nephridiopores before entering the gut. 
C) an anus that lies ventral to the mouth and inside the lophophore. 
D) All of the choices are correct 
E) None of the choices is correct 
A) cilia in the stomach area of the U-shaped gut. 
B) water passing over the anus and nephridiopores before entering the gut. 
C) an anus that lies ventral to the mouth and inside the lophophore. 
D) All of the choices are correct 
E) None of the choices is correct

Question 15

The larva of phoronids is called the _____________.

Accepted Answer

The answer of The larva of phoronids is called the...

Question 16

Nemerteans differ from flatworms in that nemerteans possess

Accepted Answer

A) an incomplete digestive tract. 
B) male and female reproductive structures in the same body. 
C) an eversible probsoscis. 
A) an incomplete digestive tract. 
B) male and female reproductive structures in the same body. 
C) an eversible probsoscis.

Question 17

Phoronid worms

Accepted Answer

A) are relatively large and usually over 30 cm in length. 
B) are tube-dwelling marine animals. 
C) are most common in deep tropical oceans near thermal vents. 
D) spend a lot of time scavenging across the sea floor. 
E) are a serious threat to oyster beds. 
A) are relatively large and usually over 30 cm in length. 
B) are tube-dwelling marine animals. 
C) are most common in deep tropical oceans near thermal vents. 
D) spend a lot of time scavenging across the sea floor. 
E) are a serious threat to oyster beds.

Question 18

Explain why ectoprocts and entoprocts are no longer considered in the phylum Bryozoa.

Accepted Answer

Ectoprocts and entoprocts were once cons

Question 19

Ectoproct colonies have modified zooids to

Accepted Answer

A) assist in reproduction. 
B) disperse the colony. 
C) secrete more exoskeleton. 
D) protect the colony and sweep away foreign particles. 
E) All of the choices are zooid specializations 
A) assist in reproduction. 
B) disperse the colony. 
C) secrete more exoskeleton. 
D) protect the colony and sweep away foreign particles. 
E) All of the choices are zooid specializations

Question 20

The lophophore contains an extension of the

Accepted Answer

A) protocoel. 
B) metacoel. 
C) mesocoel. 
D) pseudocoel. 
E) None of the choices is correct 
A) protocoel. 
B) metacoel. 
C) mesocoel. 
D) pseudocoel. 
E) None of the choices is correct

Exam 15: Polyzoa and Kryptrochozoa

The phoronid circulatory system:

The coelom of a lophophorate is divided into

The chamber in which each zooid of an ectoproct colony lives is called a ________________.

Which is NOT a correct description of the function of the phoronid lophophore?

A lophophorate phylum that is primarily marine,but also has some freshwater members is ____________ (Bryozoa).

Reproduction and development in phoronid worms involves

Which phyla are included in the Clade Krytrochozoa? Check all that apply. ____ Nemertea ____ Brachiopoda ____ Phoronida _____ Ectoprocta

How can you distinguish an ectoproct from a hydroid?

Why are these groups with diverse lifestyles (some with shells and some without,some colonial and some solitary,etc. )considered together? Be sure to list the structures and behaviors they have in common and discuss their evolutionary relationships.

Which group is so specialized that they are only found on the mouth parts of marine decapods in the northern hemisphere?

The fossil record of brachiopods shows

Entoprocts

Colonies of Ectoprocts begin from a single zooid called an _____________.

The digestive system of a phoronid worm has

The larva of phoronids is called the _____________.

Nemerteans differ from flatworms in that nemerteans possess

Phoronid worms

Explain why ectoprocts and entoprocts are no longer considered in the phylum Bryozoa.

Ectoproct colonies have modified zooids to

The lophophore contains an extension of the

Life: Biological Principles and the Science of Zoology

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Cells As Units of Life

Cellular Metabolism

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Organic Evolution

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Which phyla are included in the Clade Krytrochozoa? Check all that apply. Nemertea Brachiopoda Phoronida _ Ectoprocta