Echinodermata

Question 1

Body symmetry of Echinodermata is

Answer 1

bilateral as larvae and radial as adults

Question 2

Echinodermata are (aceolomates or eucoelomates)

Answer 2

eucoelomates

Question 3

Echinodermata (are/are not) segmented

Answer 3

are not

Question 4

Echinodermata are the first that we studied that are

Answer 4

deuterostomes

Question 5

Deuterostome blastopheres become ____ first

Answer 5

anus

Question 6

An important characteristic of Echinodermata is their _______ which is derived from _______ and composed of __________

Answer 6

endoskeleton mesoderm calcareous plates (ossicles)

Question 7

Echinodermata have _______ digestive systems

Answer 7

complete

Question 8

Echinodermata have _______ circulatory system

Answer 8

open

Question 9

The external projections of ossicles in sea stars are called

Answer 9

dermal spines

Question 10

The minute pincher-like organs of sea stars are called

Answer 10

pedicellariae

Question 11

The function of pedicellariae are

Answer 11

to keep off encrusting organisms

Question 12

These structures function to help with respiration on sea stars

Answer 12

dermal branchiae (skin gills)

Question 13

The water vascular system of sea stars function is

Answer 13

locomotion

Question 14

The water flow process of sea stars is…

Answer 14

1. the madreporite 2. the stone canal 3. the ring canal (that encircles the mouth) 4. radial canal (in each arm) 5. lateral canal (side of arms) 6. ampullae (base of tube feet) 7. tube feet or podia (extend and retract)

Question 15

When looking at sea star slides, the unfertilized eggs have

Answer 15

a nucleus and nucleolus

Question 16

When looking at sea star slides, the fertilized eggs have

Answer 16

a membrane

Question 17

When looking at sea star slides, the blastula has

Answer 17

a middle blastocoel

Question 18

When looking at sea star slides, the late gastrula has

Answer 18

a blastocoel and second cavity (archenteron)

Question 19

The endoderm germ layer

Answer 19

lines the digestive tract

Question 20

The mesoderm germ layer

Answer 20

becomes the muscle, skeleton, reproductive system

Question 21

The ectoderm germ layer

Answer 21

becomes the skin and nervous system

Question 22

Sea stars are part of the class

Answer 22

Asteroidea

Question 23

Brittle stars are part of the class

Answer 23

Ophuiroidea

Question 24

Sea Urchins are part of the class

Answer 24

Echinoidea

Question 25

Sea cucumbers are part of the class

Answer 25

Holothuroidea

Question 26

Which stage of sea star embryology is shown?

Answer 26

The unfertilized egg

Question 27

Which stage of sea star embryology is shown?

Answer 27

The fertilized egg

Question 28

Which stage of sea star embryology is shown?

Answer 28

late gastrula

Question 29

Which stage of sea star embryology is shown?

Answer 29

Two-cell stage

Question 30

Which stage of sea star embryology is shown?

Answer 30

Blastula

Question 31

Pictured are ______ which are found on ______.

They function to _____

Answer 31

pedicellaraie

sea stars

keep animals from attaching to body surface

Question 32

Pictured is _____

In this stage it shows _____ symmetry, but in adulthood shows _______ symmetry.

Answer 32

Sea Star larvae

bilateral

radial

Question 33

Identify the structures indicated by pins.

Answer 33

White - Ambulacral ridge

Yellow- pyloric caecum

Green- stomach