Echinoderm Review

____1.  The term Echinoderm means

_____ 2.  What kind of symmetry do adult starfish display?

______3.  Another name that is commonly used for the arm of the starfish is

_____4.  What organ system is unique to the phylum echinodermata?

_____ 5.  What is the name of the muscle that attaches to the tube feet in the starfish?

_____6.  The water vascular system is involved with all the following life functions EXCEPT

______7.  Sea stars are members of the class

______8.  An example of an organism in the class Ophiuroidea is

______9.  This organism is defined as have a flattened, immovable endoskeleton made up of fused plates

______10.  This organism is described as having 5 rows of calcified plates embedded in fleshy pates.  In addition, as a defense mechanism this organism will eviscerate its organs when under stress from 

______11.   In a sea star, water enters and exits the water vascular system through a structure called the

_____12.  What surface of the body is the madreporite located on?

______13.  All of the following are benefits of being radially symmetrical EXCEPT

______14.  Organisms in the class Echinoidea are most likely to feed on

______ 15.  This class of echinoderms is classified as having a rigid test with spines for protection

______ 16.  The common name for organisms in the class Crinoidea is

True or False:   Write T or F on the line provided for questions 17-23

___F___17.  All echinoderms are radially symmetrical.

___T___18.  If the population of sea urchins in an area increased, the population of algae in the area would decrease.

___F___19.  Sea cucumbers are carnivores

___F___ 20.  Sea lilies are free-swimming organisms that feed on plankton

___F___ 21.  A sea star only reproduces by regeneration.

___T___ 22.  Sea cucumbers expel their internal organs as a defense mechanism in order to give the impression to predators that they have in fact attacked and killed the prey.  Their internal organs will then be replaced through the process of regeneration.

___T___ 23.  Sea stars are carnivores that eat by inverting their stomach outside of their bodies, engulfing their prey.  

______ 24.  Which statement best describes how sea urchins and sand dollars obtain food?

_______27. You notice that a sea star in an aquarium has one very short arm. The best explanation for this is that 

_______28. Which is true of sea star body plans?

_______30.  In the Great Barrier Reef of Australia, extensive areas of coral have been destroyed by the crown of thorns, which is a type of

_______31. The skeleton of an echinoderm is an