Echinodermata

Question 1

The endoskeleton of the echinoderms is composed of
A) 	keratin ossicles.
B) 	calcareous ossicles.
C) 	keratin spicules.
D) 	calcareous spicules.

Answer 1

B) Calcareous ossicles

Question 2

The ambulacral groove is found between the
A) 	rows of tube feet.
B) 	radial nerves.
C) 	layers of pedicellariae.
D) 	rows of dermal ossicles.

Answer 2

A) Rows of tube feet

Question 3

The structures that keep the body surface clean of debris and protect the skin gills are called:

Answer 3

Pedicellariae

Question 4

The calcareous sieve opening into the water vascular system is called the
A) 	madreporite.
B) 	dermal branchiae.
C) 	lateral podia.
D) 	pedicellariae.

Answer 4

A) Madreporite

Question 5

What class is characterized by no anus, no suckers on the tube feet, articulated ossicles, and a madreporite on the oral surface?

Answer 5

Ophiuroidea

Question 6

What class is characterized by an endoskeletal test, a complex chewing apparatus, no arms, pedicellaria with three jaws, closed ambulacral grooves, and movable spines?

Answer 6

Echinoidea

Question 7

What class is characterized by arms that are not demarcated from the disc, open ambulacral grooves, tube feet with suckers, and the madreporite on the aboral surface?

Answer 7

Asteroidea

Question 8

What class is characterized by five arms with pinnules, ciliated ambulacral grooves, no pedicellariae, no madreporite, and some species have stalks?

Answer 8

Crinoidea

Question 9

Aristotle’s lantern is a complex set of ________ used in the process of ______

Answer 9

Ossicles and muscles, Chewing

Question 10

What class is characterized by a disc-shaped body, no arms, no madreporite, and a reduced water-vascular system?

Answer 10

Sea daisies

Question 11

What class is characterized by no arms, reduced ossicles, closed ambulacral grooves, and reduced tube feet?

Answer 11

Holothuroidea

Question 12

The holothuroideans have a tree-like structure in the coelom that is connected to the cloaca. The two functions of this structure are __________________ and _________________.

Answer 12

Respiration, Excretion

Question 13

Echinoderms are restricted to marine habitats because they have no structures that would allow them to ______

Answer 13

Osmoregulate

Question 14

The most accurate way to describe the echinoderm symmetry is hexamerous, radial symmetry, with exceptions such as the sea cucumbers and the larvae of most species. True or False

Answer 14

False

Question 15

The possession of a radial symmetry goes hand in hand with the lack of a head or brain in echinoderms. Further, they have radial nerves, as well as a nerve net. True or False

Answer 15

False (All true besides last statement, therefore the whole statement is false)

Question 16

When one looks at the aboral surface of a sea star, one can see the madreporite, as well as spines, podia, ambulacra, and pedicellaria. True or False

Answer 16

False

Question 17

In echinoderms, specialized excretory organs are absent. True or False

Answer 17

True

Question 18

Although species vary, the echinoderms have radially symmetrical larvae, which undergo various larval stages. True or False

Answer 18

False

Question 19

A “starfish” that has a body with many arms, set off distinctly from the central area, would be a member of the class Asteroidea. True or False

Answer 19

False

Question 20

The Aristotle’s lantern is the chewing mechanism of the echininoids. True or False

Answer 20

True