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Which of these statements is true of sponges? (Activity 33A)
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| They have an open circulatory system. |
| They are segmented animals. |
| They have no true tissues. |
| Food is digested within a gastrovascular cavity. |
| They are pseudocoelomates. |
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Which of these statements is true of cnidarians? (Activity 33A)
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| They have three tissue layers (they are triploblastic) |
| They respire via book lungs. |
| They have a nerve net. |
| They are segmented. |
| They have an exoskeleton composed of chitin. |
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Of the phyla studied in this exercise, the simplest (most primitive) one to have three tissue layers is the phylum _____. (Activity 33A)
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| Cnidaria |
| Arthropoda |
| Platyhelminthes |
| Chordata |
| Nematoda |
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Which of these statements is true of nematodes? (Activity 33A)
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| They lack a nervous system. |
| They lack a body cavity. |
| They have a digestive system with two openings. |
| Their body plan has two main tissue layers. |
| They are segmented. |
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Nematodes are most closely related to _____. (Activity 33A)
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| flatworms |
| arthropods |
| rotifers |
| annelids |
| chordates |
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Earthworms are in the phylum _____. (Activity 33A)
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| Nematoda |
| Annelida |
| Chordata |
| Platyhelminthes |
| Arthropoda |
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Which of these statements is true of earthworms? (Activity 33A)
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| They lack an excretory system. |
| They have a body cavity. |
| They have a bony endoskeleton. |
| Their digestive system consists of a gastrovascular cavity. |
| Their body plan consists of two tissue layers. |
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Snails are classified in the phylum _____. (Activity 33A)
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| Chordata |
| Mollusca |
| Cnidaria |
| Arthropoda |
| Echinodermata |
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Which of these characteristics is common to both snails and earthworms? (Activity 33A)
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| a closed circulatory system |
| segmentation |
| two tissue layers |
| an alimentary system with two openings |
| an exoskeleton |
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Grasshoppers respire via _____. (Activity 33A)
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| their skin |
| nephridia |
| book lungs |
| spiracles and tracheae |
| Malpighian tubules |
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Grasshoppers are classified in the phylum _____. (Activity 33A)
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| Annelida |
| Mollusca |
| Nematoda |
| Arthropoda |
| Echinodermata |
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As adults, sea stars _____. (Activity 33A)
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| exhibit bilateral symmetry |
| exhibit radial symmetry |
| are asymmetrical |
| exhibit no symmetry |
| lack a digestive system |
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Which of these is a characteristic of sea stars? (Activity 33A)
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| a closed circulatory system |
| nephridia |
| a brain |
| two tissue layers |
| tube feet |
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Which of these characteristics is shared by both dogs and sea stars? (Activity 33A)
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| an endoskeleton |
| a closed circulatory system |
| no excretory system |
| a brain |
| lungs |
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Dogs are classified in the phylum _____. (Activity 33A)
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| Echinodermata |
| Cnidaria |
| Arthropoda |
| Mollusca |
| Chordata |
