Simple Invertebrates

Question 1

Porifera

Answer 1

are the simplest and oldest of the multicelled animal

Question 2

Cnidaria

Answer 2

characterized by the specialized stinging structures in the tentacles surrounding the mouth

Question 3

Annelida

Answer 3

Any of various worms or wormlike animals of the phylum Annelida

Question 4

Hydroid

Answer 4

a hydrozoan polyp as distinguished from a hydrozoan jellyfish

Question 5

Jellyfish

Answer 5

a free-swimming marine coelenterate

Question 6

Platyhelminthes

Answer 6

flat worms

Question 7

Nematoda

Answer 7

having a tough outer cuticle

Question 8

Pinworms

Answer 8

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

Question 9

Tapeworms

Answer 9

Any of the ribbon-like parasitic worms

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

invertebrate lacking a coelom especially

Question 14

Radial Symmetry

Answer 14

body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis

Question 15

Asymmetry

Answer 15

The lack or absence of symmetry

Question 16

Bilateral Symmetry

Answer 16

he balanced distribution of duplicate body parts or shapes within the body of an organism

Question 17

Tentacle

Answer 17

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

Question 18

Cnidocyte

Answer 18

explosive cell containing one giant secretory organelle

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

female sex gland

Question 22

Teste

Answer 22

produce and store sperm and are also the body’s main source of male hormones