Question

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1. Which of the following organisms exhibit radial symmetry as adults? A. flatworms B. cnidarians C. roundworms D. clams E. fish 2. Which body structure describes the freshwater hydra? A. a swimming medusa with mouth pointing downward B. a swimming medusa with mouth pointing upward C. a sessile medusa with mouth pointing upward D. a sessile polyp form with mouth pointing downward E. a freely moving polyp with mouth pointing upward 3. What system do the cnidaria have that sponges lack? A. respiratory B. nervous C. circulatory D. excretory E. reproductive 4. Although adult tunicates are stuck to the ocean bottom, they are considered early relatives of vertebrates because A. tunicate gill slits are like ribs. B. tunicate adults have a notochord. C. tunicate larvae have a notochord. D. all vertebrate embryos go through a stage that resembles adult tunicates. E. tunicate adults have all four chordate characteristics. 5. The jawless fish that is parasitic, attaching itself to and sucking fluids from the tissues of a living fish, is the A. hagfish. B. lamprey. C. coelacanth. D. skate. E. ray-finned fish.

Answer 1

1) answer will be The following organisms exhibit radial symmetry as adult is B) Cnidarians.

2) answer will be The body structure describes the freshwater hydra is D) a sessile polyp form with mouth pointing downward.

3) answer will be The system do the cnidaria have that sponges lack is B) Nervous system.

4) answer will be Although adult tunicates are stuck to the ocean bottom, they are considered early relatives of vertebrates because

C) tunicate larvae have a notochord.

5) answe will be The jawless fish is parasitic, attaching itself to and sucking fluids from tissues of a living fish , is the B) lamprey.