Echinoderm

Question 1

Echinoderm

Answer 1

a marine invertebrate

Question 2

Endoskeleton

Answer 2

an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.

Question 3

Pedicellariae

Answer 3

a defensive organ like a minute pincer present in large numbers on an echinoderm.

Question 4

Madreporite

Answer 4

a perforated plate by which the entry of seawater into the vascular system of an echinoderm is controlled.

Question 5

Radial canal

Answer 5

one of the numerous minute canals lined with choanocytes which radiate from the paragastric cavity

Question 6

RIng canal

Answer 6

he circular water tube that surrounds the esophagus of echinoderms.

Question 7

Arm / Ray

Answer 7

outer limb of the echinoderm

Question 8

Radial Symmetry

Answer 8

symmetry around a central axis,

Question 9

Bilateral Symmetry

Answer 9

the property of being divisible into symmetrical halves on either side of a unique plane.

Question 10

Water Vascular System

Answer 10

a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.

Question 11

Ambulacral Groove

Answer 11

anatomical parts in echinoderms

Question 12

Ossicles

Answer 12

a small piece of calcified material forming part of the skeleton of an invertebrate animal such as an echinoderm.

Question 13

Pyloric Caecum

Answer 13

one of the tubular pouches opening into the alimentary canal in the pyloric region

Question 14

Pyloric Stomach

Answer 14

the distal aperture of the stomach, the opening

Question 15

Cardiac Stomach

Answer 15

large anterior foregut

Question 16

Ampulla

Answer 16

membranous bag shaped cavity

Question 17

Gonads

Answer 17

sex organs, make sex cells

Question 18

Central Disc

Answer 18

a circular structure either in plants or animals

Question 19

Tube Feet

Answer 19

One of the numerous external, fluid-filled muscular tubes of echinoderms used for locomotion, respiration, and grasping food or prey.

Question 20

External Fertilization

Answer 20

male organism’s sperm fertilizing a female organism’s egg outside of the female’s body

Question 21

Regeneration

Answer 21

the process of renewal, restoration

Question 22

Sea star

Answer 22

body is star-shaped and usually has five rays, though the number of rays varies

Question 23

Brittle star

Answer 23

closely related to starfish, they crawl across the sea floor using their flexible arms for locomotion.

Question 24

Sea urchin

Answer 24

enclosed in thin brittle globular tests covered with movable spines.

Question 25

Sand dollar

Answer 25

species of extremely flattened, burrowing sea urchins

Question 26

Sea lilies

Answer 26

unstalked forms are called feather stars or comatulids,

Question 27

Feather stars

Answer 27

crinoid marine invertebrates, use their grasping “legs” (called cirri) to perch on other marine life

Question 28

Sea cucumbers

Answer 28

any echinoderm of the class Holothuroidea, having an elongated body covered with a leathery skin and bearing a cluster of tentacles at the oral end

Question 29

Sea daisies

Answer 29

unusual echinoderm class Concentricycloidea,