Lab Ex 37 Survey of the Animal Kingdom - Phyla Platyhelminthes & Nematoda

Question 1

Phylum Platyhelminthes

Answer 1

flatworms

Question 2

Phylum Nematoda

Answer 2

roundworms

Question 3

Mesoderm

Answer 3

flatworms and roundworms have a cellular one of these in addition to ectoderm and endoderm

Question 4

Acoelomate

Answer 4

flatworms are this; their mesoderm is a solid mass of tissue with no internal cavity surrounded by mesoderm

Question 5

Coelomate

Answer 5

animals with major organs suspended in a coelomic cavity completely surrounded by mesoderm

Question 6

Triploblastic

Answer 6

flatworms and roundworms are described as this because they have 3 germ layers

Question 7

Organs

Answer 7

flatworms and roundworms have these things made of interdependent tissues

Question 8

Bilateral symmetry

Answer 8

having distinct anterior and posterior ends

Question 9

Hermaphroditic

Answer 9

individuals having both male and female sex organs

Question 10

Eyespots

Answer 10

sensory organs on Dugesia (flatworm)

Question 11

Pharynx

Answer 11

Dugesia feeds by sucking food through its mouth and into a tubular ____ leading to the gastrovascular cavity

Question 12

Endoparasites

Answer 12

parasites inside their host

Question 13

Ectoparasites

Answer 13

parasites on the surface of their host

Question 14

Epicuticle

Answer 14

trematodes lack an epidermis and are covered by an acellular but metabolically active ______ made of protein and lipids secreted by mesodermal cells and resists digestive enzymes; helps in respiration and absorbing nutrients

Question 15

Schistosoma

Answer 15

blood fluke, inhabits the intestinal veins and other organs of many vertebrates (including humans) and causes schistosomiasis

Question 16

Intermediate hosts

Answer 16

snails are ___ ____ for Schistosoma; an organism harboring immature stages of a parasite

Question 17

Definitive host

Answer 17

contains sexually mature, egg-laying stages of the life cycle

Question 18

Scolex

Answer 18

anterior end of a tapeworm which adheres to the host’s intestinal wall with hooks or suckers

Question 19

Neck

Answer 19

structure behind the scolex of a tapeworm; followed by series of segments called proglottids

Question 20

Proglottids

Answer 20

series of segments on a tapeworm; may be 10-15m long; self-contained packets of male and female reproductive organs

Question 21

Gravids

Answer 21

egg-carrying proglottids of tapeworms that eventually break from the end of the worm and pass from the host with its feces

Question 22

Cuticle

Answer 22

nematodes are covered with this flexible and chemically complex layer; resists digestive enzymes and is permeable only to water, dissolved gases, and some ions

Question 23

Pseudocoelom

Answer 23

roundworms have; flatworms do not; a fluid-filled space between the body wall and digestive tract in which internal organs are suspended

Question 24

Complete digestive tract

Answer 24

nematodes have this (mouth and anus)