Question 1

Which of the following animals displays radial symmetry?

Accepted Answer

A)  a fish
B)  a lobster
C)  a worm
D)  a sea anemone

Question 2

Which of the following is a unique feature of echinoderms?

Accepted Answer

A)  a water vascular system
B)  bilateral symmetry
C)  a deuterostome pattern of development
D)  radial symmetry

Question 3

Flatworms (Platyhelminthes) are _ and typically have .

Accepted Answer

A)  bilaterally symmetrical ...a complete digestive tract with a mouth and anus
B)  bilaterally symmetrical ...a gastrovascular cavity with one opening
C)  radially symmetrical ...no digestive system
D)  all parasites ...no digestive system

Question 4

During the Cambrian explosion approximately 535 to 525 million years ago,

Accepted Answer

A)  great forests produced peat layers that were later transformed into coal.
B)  animals rapidly diversified in the oceans.
C)  all modern species of animals suddenly appeared.
D)  a massive volcanic eruption nearly wiped out life on Earth.

Question 5

The most numerous,diverse,and widespread animals are the

Accepted Answer

A)  Chordata.
B)  Annelida.
C)  Mollusca.
D)  Arthropoda.

Question 6

A bilaterally symmetrical,wormlike animal that has a pseudocoelom,a complete digestive tract,and a cuticle could be a member of which one of the following phyla?

Accepted Answer

A)  Nematoda
B)  Cnidaria
C)  Chordata
D)  Annelida

Question 7

Which of the following phyla is most closely related to echinoderms?

Accepted Answer

A)  Annelida
B)  Arthropoda
C)  Mollusca
D)  Chordata

Question 8

You find a wormlike,soft- bodied adult animal in a mud flat.It is bilaterally symmetrical,is segmented,has a true coelom,and has a complete digestive tract.Based on these characteristics,what phylum does the animal represent?

Accepted Answer

A)  Cnidaria
B)  Annelida
C)  Nematoda
D)  Platyhelminthes

Question 9

The digestive tract of a nematode is most like which of the following?

Accepted Answer

A)  a cup
B)  a soda straw
C)  a sock
D)  a baseball B

Question 10

The is a flagellated cell that sweeps water through a sponge's body.

Accepted Answer

A)  spicule
B)  amoebocyte
C)  choanocyte
D)  spongin C

Question 11

According to recent genetic research,the complexity of an organism

Accepted Answer

A)  is directly correlated with the number of protein- coding genes in its genome.
B)  has more to do with how genes are used than with which genes are present.
C)  is inversely related to the number of protein- coding genes in its genome.
D)  is not related to genes or development,so it must have another source.

Question 12

Animals probably evolved from

Accepted Answer

A)  fungi.
B)  plants.
C)  bacteria.
D)  protists.

Question 13

A dog's head is at its _ end and its belly is its _ surface.

Accepted Answer

A)  anterior ...dorsal
B)  posterior ...ventral
C)  posterior ...dorsal
D)  anterior ...ventral

Question 14

Which part of this figure shows the thorax segment of this lobster?

Accepted Answer

A)  structure A
B)  structure B
C)  structure C
D)  structure D

Question 15

Which of the following statements regarding cnidarians is true?

Accepted Answer

A)  The digestive and circulatory compartment of cnidarians is called the gastrovascular cavity.
B)  Cnidarians are herbivores and can be destructive grazers on seaweeds.
C)  The more stationary cnidarian body form,which is cylindrical with a ring of tentacles,is the medusa.
D)  Cnidarians have three true tissue layers.

Question 16

Most of the animals alive today

Accepted Answer

A)  are vertebrates.
B)  are invertebrates.
C)  are really colonies of protist cells.
D)  are choanoflagellates.

Question 17

Which mollusc group includes primarily sedentary animals that use mucus- coated gills to trap fine food particles?

Accepted Answer

A)  bivalves
B)  chitons
C)  cephalopods
D)  gastropods

Question 18

Which of the following statements about deuterostomes is true?

Accepted Answer

A)  The opening that forms during deuterostome gastrulation becomes the mouth.
B)  The opening that forms during deuterostome gastrulation becomes the anus.
C)  Deuterostomes lack true tissues.
D)  Deuterostomes have only two tissue layers.

Question 19

Which of the following structures best represents a hydrostatic skeleton?

Accepted Answer

A)  a water balloon
B)  a piece of M & M candy
C)  a spoon
D)  an empty coffee mug

Question 20

Which adaptation is a key characteristic of annelids that greatly increases their flexibility and mobility?

Accepted Answer

A)  segmentation
B)  complete digestive tract
C)  hydrostatic skeleton
D)  three true tissue layers A

Exam 18: The Evolution of Invertebrate Diversity

Which of the following animals displays radial symmetry?

Correct AnswerverifiedShow Answer

Which of the following is a unique feature of echinoderms?

Correct AnswerverifiedShow Answer

Flatworms (Platyhelminthes) are _ and typically have .

Correct AnswerverifiedShow Answer

During the Cambrian explosion approximately 535 to 525 million years ago,

Correct AnswerverifiedShow Answer

The most numerous,diverse,and widespread animals are the

Correct AnswerverifiedShow Answer

A bilaterally symmetrical,wormlike animal that has a pseudocoelom,a complete digestive tract,and a cuticle could be a member of which one of the following phyla?

Correct AnswerverifiedShow Answer

Which of the following phyla is most closely related to echinoderms?

Correct AnswerverifiedShow Answer

You find a wormlike,soft- bodied adult animal in a mud flat.It is bilaterally symmetrical,is segmented,has a true coelom,and has a complete digestive tract.Based on these characteristics,what phylum does the animal represent?

Correct AnswerverifiedShow Answer

The digestive tract of a nematode is most like which of the following?

Correct AnswerverifiedB

The is a flagellated cell that sweeps water through a sponge's body.

Correct AnswerverifiedC

According to recent genetic research,the complexity of an organism

Correct AnswerverifiedShow Answer

Animals probably evolved from

Correct AnswerverifiedShow Answer

A dog's head is at its _ end and its belly is its _ surface.

Correct AnswerverifiedShow Answer

Which part of this figure shows the thorax segment of this lobster?

Correct AnswerverifiedShow Answer

Which of the following statements regarding cnidarians is true?

Correct AnswerverifiedShow Answer

Most of the animals alive today

Correct AnswerverifiedShow Answer

Which mollusc group includes primarily sedentary animals that use mucus- coated gills to trap fine food particles?

Correct AnswerverifiedShow Answer

Which of the following statements about deuterostomes is true?

Correct AnswerverifiedShow Answer

Which of the following structures best represents a hydrostatic skeleton?

Correct AnswerverifiedShow Answer

Which adaptation is a key characteristic of annelids that greatly increases their flexibility and mobility?

Correct AnswerverifiedA

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B

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C

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A