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CP Biology Study Guide—Chapter 23-24 Invertebrates
The test will consist of multiple choice, matching, and labeling diagrams.
Concept 23.1: Diverse animals share several key characteristics
You should be able to:
 Define: invertebrate and vertebrate.
 Identify characteristics of organisms classified as animals.
 Differentiate three types of symmetry animals have and give examples of phyla and/or organisms that
show each.
Concept 23.2-23.5: Sponges, Cnidarians, Flatworms and Roundworms
You should be able to:
 Define: filter-feeding, nematocyst, medusa, polyp and parasite.
 Name the phylum that sponges belong to and list characteristics of them.
 Describe characteristics of cnidarians include body form, and feeding methods.
 Describe and compare characteristics of flatworms and roundworms, especially in terms of their role
in the environment and importance to other organisms.
Concept 23.6-23.7: Mollusks and Annelids
You should be able to:
 Explain the importance of mollusks to the environment and other organisms.
 Describe general characteristics of mollusks and specific characteristics of the three classes of
mollusks.
 Describe general characteristics of segmented worms and explain the importance of earthworms to
the environment.
 Label the brain (cerebral ganglion), crop, gizzard, hearts, setae and ventral nerve cord of an
earthworm on a diagram and explain the function of those parts.
Concept 23.8: Echinoderms
You should be able to:
 Explain the importance of echinoderms to the environment and other organisms.
 Describe general characteristics of echinoderms and specific characteristics of brittle stars, sea stars
and sea cucumbers.
Chapter 24: Arthropods
You should be able to:
 Define: exoskeleton, chitin, mandibles, compound eye, spiracles, pedipalps, metamorphosis,
endoskeleton.
 Describe general characteristics of arthropods and specific characteristics of crustaceans, chelicerates
(arachnids & horseshoe crabs) and insects.
 Explain the importance of insects to the environment and other organisms.