Question 1

Cells responsible for water flow and capture of some particles are the

Accepted Answer

A)  myocytes.
B)  archaeocytes.
C)  choanocytes.
D)  pinacocytes.
E)  lophocytes.Choanocytes are responsible for water flow and capture of some food particles.F) A) and E)
G) A) and D)

Question 2

Reproduction in at least some sponges is

Accepted Answer

A)  asexual by budding.
B)  asexual by gemmules.
C)  sexual with both male and female sex cells in one individual.
D)  asexual by fragmentation.
E)  All of the choices are correct Sponges reproduce sexually and asexually.Specific reproductive mechanisms are group specific and may involve one or more of the methods described in this question.F) A) and D)
G) None of the above

Question 3

The modified cells of sponges that form circular bands and provide just a little constriction to control water flow are

Accepted Answer

A)  amoebocytes.
B)  choanocytes.
C)  spicules.
D)  myocytes.Myocytes are modified pinacocytes and constrict to regulate water flow.E) A) and D)
F) A) and C)

Question 4

A sponge feeds by

Accepted Answer

A)  using a net and a current that sweeps food particles through it.
B)  squeezing the spongocoel cavity to suck debris in and out through the osculum.
C)  beating the flagella of collar cells to form a current;food is absorbed by collar cells.
D)  beating the flagella of collar cells to form a current from osculum to pores;food is engulfed by amoebocytes in the central cavity of the sponge.Beating of flagella of collar cells creates water currents that circulate water through the body of a sponge.Water currents bring microscopic food particles into the canal system of a sponge.Food particles are filtered by collar cells.E) All of the above
F) None of the above

Question 5

Describe the characteristics of the Phylum Porifera.Which of those characteristics support the contention that the sponges are the basal group of the Animal kingdom?

Accepted Answer

The Phylum Porifera, also known as spong...

Question 6

The structural protein found in all sponges is

Accepted Answer

A)  elastin.
B)  collagen.
C)  gorgonin.
D)  spiculin.
E)  None of the choices is correct Collagen is a connective protein common to all sponges.F) A) and B)
G) B) and D)

Question 7

Sponge beds have been heavily "fished" for bath sponges and in other cases pollution or an imbalance in organisms has devastated other sponge beds.What is the likely overall consequence of this in the ocean environment?

Accepted Answer

The likely overall consequence of heavil...

Question 8

Specialized archaeocytes that secrete spongin are

Accepted Answer

A)  collencytes.
B)  sclerocytes.
C)  choanocytes.
D)  spongocytes.
E)  lophocytes.Spongocytes are archeocytes specialized for secreting spongin.F) D) and E)
G) A) and D)

Question 9

About 95% of the sponges belong to the class __________.

Accepted Answer

The answer of About 95% of the sponges belong to...

Question 10

The simplest body plan of sponges is ____________,and the plan characterized by flagellated canals is leuconoids.

Accepted Answer

The answer of The simplest body plan of sponges is...

Question 11

Which of the following statements about sponges is NOT correct?

Accepted Answer

A)  Sponges lack nerve fibers
B)  Sponges lack fully developed muscle fibers
C)  Ameboid cells capture food particles from the water
D)  Sponges reproduce asexually by budding or by regeneration from a small piece
E)  If a sponge is fragmented and cells dissociate,cells undergo somatic embryogenesis and clumps of cells can form a new organism Choanocytes create water currents,capture food,and pass food on to ameboid cells.F) All of the above
G) A) and B)

Question 12

Which statement about adult sponges is false?

Accepted Answer

A)  Their bodies are aggregations of one cell type.
B)  They do not have a mouth.
C)  Their bodies are usually asymmetrical.
D)  Their apparently simple structure is deceptive.Sponge bodies are aggregates of many cell types.Even though they lack mouths and other features of more complex animals,their apparent simplicity is deceptive.E) B) and D)
F) B) and C)

Question 13

Thin,epithelial-type cells covering the outer surface of sponges are the ________________.

Accepted Answer

The answer of Thin,epithelial-type cells covering the outer surface of...

Question 14

The minute,needle-like structures that act as a skeletal support system in sponges are called _________________.

Accepted Answer

The answer of The minute,needle-like structures that act as a...

Question 15

All digestion in sponges is intracellular and is carried out by the ____________________.

Accepted Answer

The answer of All digestion in sponges is intracellular and...

Question 16

Explain the unique attributes of hexactinellids as compared to other sponges.

Accepted Answer

Hexactinellids, also known as glass spon...

Question 17

In most sponges,the free-swimming larva produced by sexual reproduction is called a(n)

Accepted Answer

A)  bud.
B)  gemmule.
C)  apopyle.
D)  parenchymula.
E)  plasmodium.Parenchymula larvae are free-swimming larval stages that are the result of sexual reproduction and that are found in the development of most sponges.Gemmules are internal buds formed by a type of asexual reproduction in freshwater sponges and some marine sponges.F) A) and D)
G) A) and C)

Question 18

Deep-sea sponges with six-rayed siliceous spicules and a trabecular reticulum belong to the ______________.Hexactinellids are sponges with six-rayed spicules and a trabecular reticulum.

Accepted Answer

Hexactinel...

Question 19

Out of all metazoans,members of __________________ have the smallest nuclear genome but the largest mitochondrial genome.

Accepted Answer

The answer of Out of all metazoans,members of __________________ have...

Question 20

The unique feature of sponge development in members of the class Calcarea is the amphiblastula which

Accepted Answer

A)  produces new buds.
B)  generates gemmules.
C)  determines the types of spicules produced.
D)  turns inside out during its development.
E)  controls the process of regeneration.The amphiblastula is a developmental stage in members of the class Calcarea.It is also present in a few members of the class Demospongia.F) C) and D)
G) None of the above

Exam 12: Sponges and Placozoans

About 95% of the sponges belong to the class __________.

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Cells responsible for water flow and capture of some particles are the

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Describe the characteristics of the Phylum Porifera.Which of those characteristics support the contention that the sponges are the basal group of the Animal kingdom?

Correct AnswerAnswered by ExamLex AIThe Phylum Porifera, also known as spong...View AnswerShow Answer

Out of all metazoans,members of __________________ have the smallest nuclear genome but the largest mitochondrial genome.

Correct AnswerverifiedShow Answer

The modified cells of sponges that form circular bands and provide just a little constriction to control water flow are

Correct AnswerverifiedShow Answer

The structural protein found in all sponges is

Correct AnswerverifiedShow Answer

Sponge beds have been heavily "fished" for bath sponges and in other cases pollution or an imbalance in organisms has devastated other sponge beds.What is the likely overall consequence of this in the ocean environment?

Correct AnswerAnswered by ExamLex AIThe likely overall consequence of heavil...View AnswerShow Answer

The unique feature of sponge development in members of the class Calcarea is the amphiblastula which

Correct AnswerverifiedShow Answer

In most sponges,the free-swimming larva produced by sexual reproduction is called a(n)

Correct AnswerverifiedShow Answer

A sponge feeds by

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All digestion in sponges is intracellular and is carried out by the ____________________.

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The minute,needle-like structures that act as a skeletal support system in sponges are called _________________.

Correct AnswerverifiedShow Answer

Specialized archaeocytes that secrete spongin are

Correct AnswerverifiedShow Answer

Which of the following statements about sponges is NOT correct?

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Explain the unique attributes of hexactinellids as compared to other sponges.

Correct AnswerAnswered by ExamLex AIHexactinellids, also known as glass spon...View AnswerShow Answer

Reproduction in at least some sponges is

Correct AnswerverifiedShow Answer

Thin,epithelial-type cells covering the outer surface of sponges are the ________________.

Correct AnswerverifiedShow Answer

Which statement about adult sponges is false?

Correct AnswerverifiedShow Answer

Deep-sea sponges with six-rayed siliceous spicules and a trabecular reticulum belong to the ______________.Hexactinellids are sponges with six-rayed spicules and a trabecular reticulum.

Correct AnswerverifiedHexactinel...View AnswerShow Answer

The simplest body plan of sponges is ____________,and the plan characterized by flagellated canals is leuconoids.

Correct AnswerverifiedShow Answer

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The Phylum Porifera, also known as spong...
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Correct Answer
Answered by ExamLex AI
The likely overall consequence of heavil...
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Hexactinellids, also known as glass spon...
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Hexactinel...
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