Echinoderms

Question 1

Echinoderm

Answer 1

largest phylum that has no freshwater or terrestrial (land-based) representatives.

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 in some sponges

Question 6

Ring canal

Answer 6

the circular water tube that surrounds the esophagus of echinoderms

Question 7

Radial Symmetry

Answer 7

symmetry around a central axis, as in a starfish or a tulip flower.

Question 8

Bilateral Symmetry

Answer 8

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

Question 9

Water Vascular System

Answer 9

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

Question 10

Ambulacral Groove

Answer 10

parts that include ossicles, plates, spines, and suckers.

Question 11

Ossicles

Answer 11

a very small bone, especially one of those in the middle ear.

Question 12

Pyloric Caecum

Answer 12

This organ with fingerlike projections is located near the junction of the stomach and the intestines.

Question 13

Pyloric Stomach

Answer 13

The pylorus is considered as having two parts

Question 14

Cardiac Stomach

Answer 14

The cardiac stomach is the narrow region surrounding the opening of the esophagus that contains cardiac glands in the mucosa.

Question 15

Ampullae

Answer 15

a roughly spherical flask with two handles, used in ancient Rome.

Question 16

Gonads

Answer 16

an organ that produces gametes; a testis or ovary.

Question 17

Central Disc

Answer 17

he jelly-like inner substance can be squeezed, or pushed out to the side, or back. And touch or put pressure on one of the spinal nerves.

Question 18

Tube Feet

Answer 18

each of a large number of small, flexible, hollow appendages protruding through the ambulacra, used either for locomotion or for collecting food

Question 19

External Fertilization

Answer 19

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

Question 20

Regeneration

Answer 20

the action or process of regenerating or being regenerated, in particular the formation of new animal or plant tissue.

Question 21

Sea star

Answer 21

Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea.

Question 22

Brittle star

Answer 22

Brittle stars or ophiuroids are echinoderms in the class Ophiuroidea closely related to starfish. They crawl across the sea floor using their flexible arms for locomotion.

Question 23

Sea urchin

Answer 23

Sea urchins or urchins are typically spiny, globular animals, echinoderms in the class Echinoidea.

Question 24

Sand dollar

Answer 24

The term sand dollar refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida.

Question 25

Sea lilies

Answer 25

Crinoids are marine animals that make up the class Crinoidea of the echinoderms.

Question 26

Feather stars

Answer 26

Crinoids are marine animals that make up the class Crinoidea of the echinoderms.

Question 27

Sea cucumbers

Answer 27

Sea cucumbers are echinoderms from the class Holothuroidea. They are marine animals with a leathery skin

Question 28

Sea daisies

Answer 28

Sea daisies make up an unusual group of deep-sea taxa belonging to the phylum Echinodermata