invertebrates

Question 1

Porifera

Answer 1

Or sponges, are the simplest and oldest of the multicelled animals.

Question 2

Cnidaria

Answer 2

Characterized by the specialized stinging structures in the tentacles surrounding the mouth.

Question 3

Annelida

Answer 3

Also known as the ringed worms or segmented worms.

Question 4

Hydroid

Answer 4

A hydrozoan polyp as distinguished from a hydrozoan jellyfish.

Question 5

Jellyfish

Answer 5

Has a nearly transparent saucer-shaped body and extensible marginal tentacles studded with stinging cells.

Question 6

Platyhelminthes

Answer 6

Are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.

Question 7

Nematoda

Answer 7

Free-living forms and disease-causing parasites, such as the hookworm and filaria.

Question 8

Pinworms

Answer 8

A small nematoid worm that inhabits the rectum of the human host.

Question 9

Tapeworms

Answer 9

Characterized by possessing a scolex with bothria that aid in attaching to their host, as well as a thin, long strobila body resembling a strip of tape or ribbon.

Question 10

Bivalves

Answer 10

Having a shell consisting of two halves hinged together.

Question 11

Gastropods

Answer 11

Usually with a univalve shell or none and a distinct head bearing sensory organs.

Question 12

Coelomate

Answer 12

Have a body cavity called a coelom with a complete lining called peritoneum derived from mesoderm.

Question 13

Acoelomate

Answer 13

Comprising the flatworms and nemerteans and characterized by bilateral symmetry and a digestive cavity

Question 14

Radial Symmetry

Answer 14

Arrangement of parts of an organism around a single main axis.

Question 15

Asymmetry

Answer 15

The body plan of many organisms exhibit symmetry.

Question 16

Bilateral Symmetry

Answer 16

Body plan in which the left and right sides of the organism can be divided into approximate mirror images of each other along the midline.

Question 17

Tentacle

Answer 17

A narrow, flexible, unjointed part extending from the body of certain animals.

Question 18

Cnidocyte

Answer 18

Is an explosive cell containing one giant secretory organelle or cnida

Question 19

Ectoderm

Answer 19

One of the three primary germ layers in the very early embryo.

Question 20

Endoderm

Answer 20

The innermost of the primary germ layers of an animal embryo.

Question 21

Ovary

Answer 21

The female gonad or reproductive gland.

Question 22

Teste

Answer 22

The male sex gland.