Simple Invertebrits

Question 1

Porifera

Answer 1

an animal phylum comprising the sponges.

Question 2

Cnidaria

Answer 2

Cnidaria is a phylum containing over 10,000 species of animals found exclusively in aquatic environments: they are predominantly marine species. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey.

Question 3

Annelida

Answer 3

The annelids, also known as the ringed worms or segmented worms, are a large phylum, with over 17,000 extant species including ragworms, earthworms, and leeches.

Question 4

Hydroid

Answer 4

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

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

Question 7

Nematoda

Answer 7

a class of worms, Modern Latin compound of nemat- “thread”

Question 8

Pinworms

Answer 8

small nematode worm that is an internal parasite of vertebrates.

Question 9

Tapeworms

Answer 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.

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

Cephalopods

Answer 11

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

Question 12

Gastropods

Answer 12

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

Question 13

Coelomate

Answer 13

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

Question 14

Acoelomate

Answer 14

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 15

Radial Symmetry

Answer 15

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

Question 16

Asymmetry

Answer 16

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

Question 17

Bilateral Symmetry

Answer 17

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

Question 18

Tentacle

Answer 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.

Question 19

Cnidocyte

Answer 19

is an explosive cell containing one giant secretory organelle or cnida

Question 20

Ectoderm

Answer 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.

Question 21

Endoderm

Answer 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.

Question 22

Ovary

Answer 22

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

Question 23

Teste

Answer 23

the witnessing or concluding clause of a writ or other precept.