echinoderms

Question 1

what are the 5 classes of echinoderms?

Answer 1

echinoidea
holothuroidea
asteroidea
crinoidea
ophiuroidea

Question 2

what is the dosal/ventral side of a seastar called?

Answer 2

aboral/oral

Question 3

defining characteristics of echinoderms

Answer 3

• water vascular system
• pentamerous symmetry in adults
• calcareous ossicles derived from mesodermal tissue forming an exoskeleton

Question 4

what are the functions of the WVS?

Answer 4

• movement
• respiration
• excretion
• feeding and sensory

Question 5

what type of spawners are echinoderms?

Answer 5

broadcast

Question 6

what type of lifestyle are echinoderms?

Answer 6

complex.

• radial metamorphosis
• bilateral symmetrical larvae

Question 7

pedicellaria are for what purpose?

Answer 7

protection (help move things away, keep algae off, etc.)

Question 8

what three methods of feeding for echinoderms?

Answer 8

deposit
filter
suspension
carniverous

Question 9

what type of reproduction for echinoids?

Answer 9

dioecious

Question 10

how many stomachs do asteroidea have? describe.

Answer 10

two.

1: lower (1st); cardiac, digestion
2: upper (2nd); pyloric, secretion of digestive enzymes, absorption of nutrients

Question 11

what type of feeders are class holothruoidea?

Answer 11

deposit or suspension feeders. use tentacles

Question 12

describe eviscaration for cucumbers

Answer 12

can eject part of their gut to scare away predators. a form of autotomy