TOPIC 25: Deuterostomia

Question 1

3 phyla of deuterostomia

Answer 1

echinodermata, hemichordata and chordata

Question 2

deuterostomes undego ____ embryotic development

Answer 2

deuterostome

Question 3

how is clade deuterostomia defined by?
a) molecular phylogeny
b) morphology

Answer 3

molecular

Question 4

characteristics of echinoderms

Answer 4

• adults have radial symmetry
• thin epidermis that covers the exoskeleton of ossicles
• water vascular system
• diffuse nervous system
• sezual senses and broadcast spawners

Question 5

calcareous plates and spines that are imbedded in thr dermis of echinoderms

Answer 5

ossicle

Question 6

what are echinoderms

Answer 6

slow moving/ sessile marine animals

Question 7

describe the water vascular system

Answer 7

derived from the coeleom and consists of a ring at the central disk and a network of hydrualic canals runnign down the length of each arm

Question 8

what do the radial canald branch out into

Answer 8

branch out into tube feet

Question 9

what are tube feet adapted for

Answer 9

locomotion, sensory, feeding, resperitory purposes, etc.

Question 10

structure in the echinoderms that allows water to pass in and out of the water vascular system

Answer 10

madreporite

Question 11

what does it mean by broadcast spwaners

Answer 11

they release gametes into the water and external fertilization takes place

Question 12

do echinoderms have a larval stage

Answer 12

yes

Question 13

includes starfish, sea stars and sea daisies

Answer 13

asteroidea (echinoderm phyla)

Question 14

group with tube feat under their arms

Answer 14

asteroidea

Question 15

echinoderm group with 5 arms of tube feet, slow moving and are herbivores (sea urchins, sand dollars)

Answer 15

echinoidea