6. The most ancient branch point in animal phylogeny is that between having A) r

Question

6. The most ancient branch point in animal phylogeny is that between having A) radial or bilateral s B) a welli-defined head or no head. C) diploblastic or triploblastic embryos. D) true tissues or no tissues E) a body cavity or no body cavity 7. A land snail, a clam, and an octopus all share A) a mantle B) a radula C) gills D) embryonic torsion. E) distinct cephalization. 8. Which phylum is characterized by animals that have a segmented body? A) Cnidaria B) Platyhelminthes C) Porifera D) Arthropoda E) Mollusca 9. The water vascular system of echinoderms A) functions as a circulatory system that distributes nutrients to body cells. B) functions in locomotion and feeding. C) is bilateral in organization, even though the adult animal is not bilaterally symmetrical. D) moves water through the animal's body during suspension feeding. E) is analogous to the gastrovascular cavity of flatworms 10. Which of the following combinations of phylum and description is incorrect? A) Echinodermata-bilateral symmetry as a larva, coelom present B) Nematoda-roundworms, pseudocoelomate C) Cnidaria-radial symmetry, polyp and medusa body forms D) Platyhelminthes-flatworms, gastrovascular cavity, acoelomate E) Porifera-gastrovascular cavity, coelom present 11. Which characteristic(s) is (are) shared by both cnidarians and flatworms? A) dorsoventrally flattened bodies B) true muscle C) radial symmetry D) a digestive system with a single opening E) two of these

Explanation / Answer

Answer:

6). D. True tissues or no tissues

Explanation:

Primitive phyla do not have true tissues.

7). A. a mantle

8). D. Arthropoda

Explanation: Arthropoda phylum characterized by their segmented bodies, jointed appendage's and hard external skeletons.

9). B. Functions in locomotion and feeding

Explanation:

Water vascular system is a network of hydraulic canals unique to echinoderms that branches into extensions called tube feet. Functions in locomotion, respiration, feeding and waste transportation.

10). A. Echinodermata-bilateral symmetry as a larva, coelom present

Explanation:

Adult echinoderms possess pentaradial, or five-sided, symmetry, echinoderm larvae are ciliated, free-swimming organisms that organize in bilateral symmetry

11). D. a digestive system with a single opening

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