Simple Invertebrate

Question 1

Porifera

Answer 1

the Hexactinellida (glass sponges), the Demospongia, and the Calcarea (calcareous sponges).

Question 2

Cnidaria

Answer 2

A phylum of more or less radially symmetrical invertebrate animals that lack a true body cavity.

Question 3

Annelida

Answer 3

Is a group commonly referred to as segmented worms.

Question 4

Hydroid

Answer 4

Are a life stage for most animals of the class Hydrozoa.

Question 5

Jellyfish

Answer 5

A free-swimming marine coelenterate with a jellylike bell- or saucer-shaped body that is typically transparent and has stinging tentacles around the edge.

Question 6

Platyhelminthes

Answer 6

A group of soft-bodied, usually much flattened invertebrates.

Question 7

Nematoda

Answer 7

Roundworms (nematodes) are bilaterally symmetrical, worm-like organisms that are surrounded by a strong, flexible non cellular layer called a cuticle.

Question 8

Pinworms

Answer 8

Are small parasites that can live in the colon and rectum.

Question 9

Tapeworms

Answer 9

A parasitic flatworm, the adult of which lives in the intestine of humans and other vertebrates.

Question 10

Bivalves

Answer 10

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

Question 11

Gastropods

Answer 11

A mollusk of the large class Gastropoda, such as a snail, slug, or whelk.

Question 12

Coelomate

Answer 12

Have a body cavity called a coelom with a complete lining called peritoneum derived from mesoderm (one of the three primary tissue layers).

Question 13

Acoelomate

Answer 13

An invertebrate lacking a coelom especially : one belonging to the group comprising the flatworms and nemerteans and characterized by bilateral symmetry and a digestive cavity that is the only internal cavity.

Question 14

Radial Symmetry

Answer 14

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

Question 15

Asymmetry

Answer 15

Lack of equality or equivalence between parts or aspects of something; lack of symmetry.

Question 16

Bilateral Symmetry

Answer 16

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

Question 17

Tentacle

Answer 17

A slender flexible limb or appendage in an animal, especially around the mouth of an invertebrate, used for grasping, moving about, or bearing sense organs.

Question 18

Cnidocyte

Answer 18

Is an explosive cell containing one giant secretory organelle or cnida (plural cnidae) that defines the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish, etc.).

Question 19

Ectoderm

Answer 19

The outermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the epidermis and nerve tissue.

Question 20

Endoderm

Answer 20

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

Question 21

Ovary

Answer 21

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

Question 22

Teste

Answer 22

The male sex gland, located behind the penis in a pouch of skin called the scrotum.