BIO 104 Deuterostomes exam questions
with verified answers
Phylum Echinodermata -Correct Answer-Sea stars
Which phylum is exclusively marine? -Correct Answer-Phylum Echinodermata
Pentaradial symmetry -Correct Answer-5 planes of symmetry
Origin of Echinoderms -Correct Answer-remains unclear
Echinoderm larvae have what kind of symmetry -Correct Answer-Bilateral
Echinoderm aduts have what kind of symmetry -Correct Answer-Pentaradial
--nervous system is nerve ring with branches -no centralization of function
Endoskeleton of Echinoderms -Correct Answer--Epidermis covered
-Composed of calcium carbonate ossicles
-May be tightly or loosely joined
-All members have mutable collagenous tissue
Water-Vascular system of Echinoderms -Correct Answer--Radially organized
--Radial canals extend from ring call into each body branch
-Water enters through Madreporite
-flows through stone canal to ring canal
-Tube feet
Tube feet -Correct Answer-May or may not have suckers
, Ampulla -Correct Answer-Muscular sac at base
--used in movement, feeding, gas exchange
Regeneration of sea stars -Correct Answer--Many able to regenerate lost parts
-Some reproduce asexually by splitting
Reproduction of sea stars -Correct Answer--Most sexual
-Gonochoric- separate sexes
-Gametes released into water
-Free-swimming larvae
Classes of Echinoderms -Correct Answer-Asteroidea
Ophiuroidea
Echinoidea
Holothuroidea
Crinoidea
Asteroidea
-Class of Echinoderms -Correct Answer-•Sea stars and sea daisies
•Important predators in many marine systems
•Most have 5 arms, some have multiples of 5
•Digestive space and gonads extend into arms
Ophiuroidea
-Class of Echinoderms -Correct Answer-•Brittle stars
•Largest class
•Arms easily broken of ("brittle")
•Tube feet used for feeding, not moving
•Move by "rowing" with their arms
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