Chapter 23, Problem 1MC

Cubozoans are______. a. polyps b. medusoids c. polymorphs d. sponges

Cnidocytes are found in _____. a. phylum Porifera b. phylum Nemertea c. phylum Nematoda d. phylum Cnidana

Echinoderms in their larval state have ______. a. triangular symmetry b. radial symmetry c. hexagonal symmetry d. bilateral symmetry

Which group of flatworms are primarily external parasites of fish? a. monogeneans b. trematodes c. cestodes d. turbellarians

Figure 15.24 Which of the following statements about the anatomy of a mollusk is false? a. Mollusks have a radula for scraping food. b. Mollusks have ventral nerve cords. c. The tissue beneath the shell is called the mantle. d. The mantle cavity contains hemolymph.

Which phylum includes animals that have a water vascular system? a. Echinodermata b. Hemichordata c. Chordata d. Tetrapoda e. Amniota

Which of the following is not a member of the phylum Chordata? a. Cephalochordata b. Echinodermata c. Urochordata d. Vertebrata

Members of Chondrichthyes differ from members of Osteichthyes by having a _______. a. jaw b. bony skeleton c. cartilaginous skeleton d. two sets of paired fins

Flatworms digest food ___________ a. inside their cells c. in a gastrovascular cavity b. in a gizzard d. in a complete digestive tract