simple invertebrates

Question 1

animal pyhlum comprising the sponges

Answer 1

Porifera

Question 2

Any of various invertebrate animals of the phylum Cnidaria, characterized by a radially symmetrical body with a saclike internal cavity and stinging nematocysts, and including the jellyfishes, hydras, sea anemones, and corals

Answer 2

Cnidaria

Question 3

Any of various worms or wormlike animals of the phylum Annelida, characterized by an elongated, cylindrical, segmented body and including the earthworms and the leeches

Answer 3

Annelida

Question 4

a coelenterate of an order that includes the hydras. They are distinguished by the dominance of the polyp phase.

Answer 4

Hydroid

Question 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

Answer 5

Jellyfish

Question 6

a phylum of worms having bilateral symmetry and a soft, usually flattened body, comprising the flatworms.

Answer 6

Platyhelminthes

Question 7

any unsegmented worm of the phylum Nematoda, having an elongated, cylindrical body; a roundworm.

Answer 7

Nematoda

Question 8

a small nematode worm that is an internal parasite of vertebrates.

Answer 8

Pinworms

Question 9

a parasitic flatworm, the adult of which lives in the intestine of humans and other vertebrates. It has a long ribbonlike body with many segments that can become independent, and a small head bearing hooks and suckers.

Answer 9

Tapeworms

Question 10

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

Answer 10

Bivalves

Question 11

an active predatory mollusk of the large class Cephalopoda, such as an octopus or squid.

Answer 11

Cephalopods

Question 12

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

Answer 12

Gastropods

Question 13

main body cavity in most multicellular animals and is positioned inside the body to surround and contain the digestive tract and other organs.

Answer 13

Coelomate

Question 14

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.

Answer 14

Acoelomate

Question 15

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

Answer 15

Radial Symmetry

Question 16

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

Answer 16

Asymmetry

Question 17

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

Answer 17

Bilateral Symmetry

Question 18

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.

Answer 18

Tentacle

Question 19

explosive cell containing one giant secretory organelle or cnida

Answer 19

Cnidocyte

Question 20

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.

Answer 20

Ectoderm

Question 21

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.

Answer 21

Endoderm

Question 22

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

Answer 22

Ovary

Question 23

male egg-shaped glands

Answer 23

Teste