Platyhelminthes

Question 1

greek word for worm?

Answer 1

helminth
(Hence playhelminthes)

Question 2

what coelom type are platyhelminthes in?

Answer 2

Acoelomate - no cavity between gut and body wall

Question 3

what is the platyhelminthes symmetry?

Answer 3

Bilateral.

Question 4

what is Parenchyma tissue?

Answer 4

cellular tissue lying between the body wall and the organs of invertebrate animals lacking a coelom,

Question 5

define Cephalization

Answer 5

the concentration of sense organs, nervous control, etc., at the anterior end of the body, forming a head and brain, both during evolution and in the course of an embryo’s development.

Question 6

what is the digestive tract system?

Answer 6

simple (imcomplete)

Question 7

what are the 3 parasitic classes?

Answer 7

1. Trematoda
2. Monnogenea
3. Cestoda

Question 8

do platyhelminthes have an anus?

Answer 8

no.

Question 9

name the 4 platyhelminthes classes

Answer 9

1. class turbellaria
2. class Trematoda
3. class Monogenea
4. class Cestoda

Question 10

i am mostly free living and aquatic with more than 3000 species - what class am i?

Answer 10

Turbellaria

Question 11

I am a fluke with holdfast devices, parasitic and have more than 10,000 species, what class am i?

Answer 11

Trematoda

Question 12

i am a fluke with only a single-host life cycle. i am a parasite and have 1100 species, what class am i?

Answer 12

Monogenea

Question 13

i am a parasitic tapeworm with 2 host life cycles, 3500 species, what class am i?

Answer 13

Cestoda

Question 14

what are the 3 types of gut morphology?

Answer 14

1. Acoela
2. Tricladida ( intenstine with 3 branches)
3. polycladida (multiple branches

Question 15

define Ectoderm?

Answer 15

surface of the embryo, forms nervous system and the outer skin and its derivatives

Question 16

in flatworms locomotion and protection are aided by?

Answer 16

mucus secretions

Question 17

define mesoderm

Answer 17

between the ectoderm and endoderm in triploblastic animals, forms coelomic lining, the circulatory system, most of the internal support structures and the musculature

Question 18

define endoderm?

Answer 18

innermost germ layer, forms the main portion of the gut and associated structures

Question 19

the mesenchyme/ parenchyma…

Answer 19

includes a variety of loose and fixed cells, muscle fibres and connective tissues

Question 20

an incomplete gut includes…

Answer 20

mouth, pharynx and intenstine. no anus

Question 21

define Protonephridia

Answer 21

an excretory tube that lacks an internal opening. It is found in Platyhelminthes, Rotifers, and some Chordates. The end of the tubule has solenocytes (flagellated) or flame cells (ciliated). They help in osmoregulation

Question 22

defining characteristic of class Cestoda: tapeworms

Answer 22

1. small anterior hooked attachment organ (scolex)
2. division of body into segments
3. absence of digestive tract