Simple invertebrate

Question 1

Referred to as sponges. Don’t have mouths, they have tiny pores in their outer walls.

Answer 1

Porifera

Question 2

More complex than sponges. They have 2 main layers of cells that sandwich a middle layer of “jelly”. (radial symmetry)

Answer 2

Cnidaria

Question 3

Referred to as segmented worms. (earth worms, leeches). Has 3 body regions; Head, Segments, Pygidium.

Answer 3

Annelida

Question 4

A life stage for most animals in the class of hydrozoa. A hydrozoan polyp as distinguished from a hydrozoan jellyfish.

Answer 4

Hydroid

Question 5

Jellyfish or sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a big part of the phylum Cnidaria.

Answer 5

Jellyfish

Question 6

Flatworms; Platy meaning flat, helminth meaning worm (in greek). Unsegmented, soft body, invertebrates.

Answer 6

Platyhelminthes

Question 7

Round worms, bilaterally symmetrical, worm like organisms surrounded by a strong flexible noncellular layer called a cuticle.

Answer 7

Nematoda

Question 8

Also known as a thread worm (parasite), common intestinal parasite

Answer 8

Pinworms

Question 9

Parasitic worm, in the flatworm phylum. They anchor themselves in the intestines. Have no mouth, absorb nutrients from the hosts gut.

Answer 9

Tapeworms

Question 10

Aquatic mollusk that has a compressed body enclosed within a hinged shell, such as oysters, clams, mussels, and scallops.

Answer 10

Bivalves

Question 11

Mollusk of the large class Gastropoda, (Ex; snail, slug, or whelk).

Answer 11

Gastropods

Question 12

Have a fluid filled cavity between the body wall and the gut. The cavity is completely enclosed by mesoderm. (Ex; Molluscs, arthropods, chordates).

Answer 12

Coelomate

Question 13

(“False cavity”), which is a fully functional body cavity. Tissue derived from mesoderm only partly lines the fluid filled body cavity of these animals. Digestive cavity is the only internal cavity.

Answer 13

Acoelomate

Question 14

Symmetry around a central axis, (starfish or a tulip flower)

Answer 14

Radial symmetry

Question 15

If the sides are different, that’s asymmetry. (Sponges)

Answer 15

Asymmetry

Question 16

Being divisible into symmetrical halves on either side

Answer 16

Bilateral symmetry

Question 17

Flexible limb or appendage in an animal, especially around the mouth of an invertebrate, used for grasping, moving about. (Octopus, Suction)

Answer 17

Tentacle

Question 18

Produce & store sperm, are also the body’s main source of male hormones, such as testosterone. These hormones control the development of the reproductive organs and other male characteristics.

Answer 18

Teste

Question 19

Explosive cell containing one giant secretory organelle or cnida. Used for prey capture and defense from predators.(corals, sea anemones, hydrae, jellyfish, etc.)

Answer 19

Cnidocyte

Question 20

The outermost layer of cells or tissue of an embryo in early development, which include the epidermis (ecto-epid) and nerve tissue.

Answer 20

Ectoderm

Question 21

The innermost layer of cells or tissue of an embryo in early development, which include the lining of the gut and associated structures.

Answer 21

Endoderm

Question 22

A female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates.

Answer 22

Ovary