Glencoe Biology

Chapter 25: Worms and Mollusks

Standardized Test Practice-English

1
Which of these statements is true regarding flatworms and roundworms?
A)They both have radial symmetry.
B)They are both pseudocoelomates.
C)They are both coelomates.
D)They both have bilateral symmetry.
2
Flatworms feed by extending an organ called a ____ from their mouths.
A)ganglia
B)pharynx
C)flame cell
D)tubule
3
Which of these features is a similarity between flatworms and cnidarians?
A)both utilize flame cells
B)both have circulatory and respiratory organs
C)both have an excretory system
D)both lack circulatory and respiratory organs
4
What term describes the pseudocoelom providing rigid support for muscles to work against?
A)trichinosis
B)hydrostatic skeleton
C)gastropod
D)mantle
5
How are rotifers different from roundworms?
A)They move through water.
B)They have bilateral symmetry.
C)They are pseudocoelomates.
D)They evolved from an ancestral protist.
6
What comparison can be made between roundworms and flatworms, based on this evolutionary tree?

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A)Both have bilateral symmetry.
B)Only flatworms evolved from an ancestral protist.
C)Both are pseudocoelomates.
D)Both have radial symmetry.
7
Why is the roundworm C. elegans useful for scientific research?
A)does not contain DNA bases
B)large number of cells and long zygote maturation
C)small number of cells and short zygote maturation
D)DNA does not encode genes
8
The ____ is a membrane that surrounds the internal organs of the mollusk.
A)ascarid
B)radula
C)siphon
D)mantle
9
The ____ is a tonguelike organ with rows of teeth for obtaining food.
A)mantle
B)radula
C)internal shell
D)gill
10
What is the purpose of this mollusk adaptation?

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A)light-reception
B)protection
C)feeding
D)digging
11
Why is an open circulatory system suitable for many mollusks?
A)Slow moving animals need rapid intake of oxygen.
B)Slow moving animals do not need rapid intake of oxygen.
C)This system allows oxygen intake through the shell.
D)This system prevents oxygen loss through the shell.
12
What can be concluded about annelids based on this evolutionary tree?

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A)lack segmentation and have coeloms
B)lack coeloms and protostome development
C)have coeloms and are segmented
D)are segmented and closely related to cnidarians
13
What is the name and function of the hair-like projections in this earthworm cross section?

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A)satae; aids in respiration
B)gizzard; secretes lubricant
C)crops; protects from predators
D)satae; provide anchor for pushing through soil
14
What do these cladograms represent?

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A)interpretations of possible mollusk and annelid evolutions
B)structural features of present-day mollusks and annelids
C)theory that mollusks and annelids have no evolutionary differences
D)food chain for mollusks and annelids
15
Which of the following is true of annelid segments?
A)Only individual segments can have special functions.
B)Groups of segments can adapt to particular functions.
C)Segments can function in locomotion but not excretion.
D)The main function of segments is respiration.
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