Unit #5 Quiz #2

1. Unit #5 Quiz #2 Grade: «grade» «subject» Subject: «date» Date:

2. 1 Which of the following echinoderms have primitive gills: A Sea Urchin B Sea Star C Sand Dollar D Sea Cucumber

3. 2 A sea star is torn in half by a predator. What must be included in the remaining sea star for it to be able to completely regenerate? A A majority of the arms B A fragment of the stomach C A fragment of the central disc D A majority of the water vascular system

4. 3 The animal in the following pictures represents ___________. A asymmetry B radial symmetry C bilateral symmetry D hexamerism

5. 4 What chemical makes up the endoskeleton of echinoderms? A Chitin B Spicules C Spongin D Calcium carbonate

6. 5 Which of the following does NOT describe a defense mechanisms found within echinoderms: A A sea cucumber expelling its intestines out to scare off predators B A sea star tearing itself in half to intimidate predators C A sea urchin having poisonous spines on its back D A brittle star being able to regenerate a leg dropped from its body when a predator grabbed it

7. 6 The water vascular system found within echinoderms is an evolutionary precursor to which of the following systems: A Endocrine system found within humans B Excretory system found within humans C Cardiovascular system found in humans D Respiratory system found within humans

8. 7 You reach into a tank and poke a brittle star fish. It responds by quickly moving under a nearby rock and curling into a ball. Which receptor provides the information allowing the brittle star to know that it is under a rock: A Photoreceptor B Thigmoreceptor C Chemoreceptor D Statocyst

9. 8 One advantage of a complete digestive system over an incomplete digestive system is that an organism with a complete system: A Must pause to eject waste through its mouth prior to eating a food source larger than its’ GVC B Can continue to consume food without having to eject that food through the same orifice that it is consuming food C Must input food through multiple orifices while ejecting waste out of similar orifices D An organism can simply diffuse nutrients through the thin tissues surrounding the organism

10. 9 Brittle stars and sea stars differ in their modes of movement in that: A Brittle stars use hydraulics within their tube feet to suction onto a surface and hold there for a long period of time, while sea stars drag themselves across a surface with tube feet that resemble spines B Sea stars use hydraulics within their tube feet to suction onto a surface and hold there for along period of time, while brittle stars drag themselves across a surface with tube feet that resemble spines C Brittle stars use their tube feet to slide across a surface similar to the motion of a hover craft D Sea stars can push water out of their mouth to lift themselves off of a surface and push themselves onto another, whereas s brittle star must climb up the same object

11. 10 Why do sea urchins have the longest tube feet of all echinoderms? A They need long tube feet to reach beyond or between their protective spines B The need the long tube feet to reach food from their most anterior end to their most posterior end to feed C They use these long tube feet to help open and close their shell-crushing teeth D They use these long tube feet to open the shells of the strongest bivalves

12. 11 Tube feet found within an echinoderm are responsible for all of the following EXCEPT: A Feeding B Digestion C Locomotion D Absorbing dissolved oxygen

13. 12 Sea stars lack teeth, but are active carnivores. How do they accomplish this? A Sea stars use their tube feet to tear their prey apart B Sea stars use their spines to poison prey prior to eating it C Sea stars use their water vascular system to asphyxiate their prey D Sea stars eject their stomach/digestive enzymes to dissolve their prey