PHYLUM PLATYHELMINTHES

Question 1

they ar some of the most primitive triploblastic animals and mark an important step in animal evolution

Answer 1

Flatworms

Question 2

the first bilaterally symmetrical animals

Answer 2

Flatworms

Question 3

bilateral symmetry is accompanied by

Answer 3

cephalization

Question 4

it is the concentration of sensory organs and brain in now the anterior part of the animal

Answer 4

cephalization

Question 5

allows for food location and immediate sensing and detection when in a new environment

Answer 5

head

Question 6

they do not have a body cavity between their gut and body

Answer 6

aceolomates

Question 7

they do not have a coelom and their semi solid mesdoerm hold their tissues and organs in places

Answer 7

platyhelminthes and acoelomorpha

Question 8

they have organs like eye spots and some well-developed organ systems such as their reproductive system

Answer 8

flatworms

Question 9

they do not have respiratory and circulatory systems which limits them to a flat and thin shape in order to allow diffusion of oxygen and nutrients throughout their body

Answer 9

Flatworms

Question 10

they move using muscle contraction and cilia

Answer 10

flatworms

Question 11

flatworms move using —– and —-

Answer 11

muscle contraction and cilia

Question 12

they are found in water and humid environments including the digestive system of vertebrates when they are parasites

Answer 12

Flatworms

Question 13

most members of the platyhelminthes are —-

Answer 13

hermaphrodites

Question 14

most of their eggs are fertilized internally hatching into miniature versions of the adults or larvae

Answer 14

flatworms

Question 15

4 classes of phylum Platyhelminthes

Answer 15

Turbellaria
Cestodes
Monogenea
Trematoda

Question 16

they are mostly free-living predators or scavengers, a few are parasites

Answer 16

Turbellaria

Question 17

they usually feed through a pharynx situated near the middle of their underside and have ocelli that allows them to detect light

Answer 17

turbellaria

Question 18

where do turbellaria feed through

Answer 18

pharynx

Question 19

it is situated near the middle of their underside

Answer 19

pharynx

Question 20

eye structures with pigments that allows them to detect light

Answer 20

ocelli

Question 21

how can turbellaria clone themselves

Answer 21

budding or splitting

Question 22

they can clone themselves through budding or splitting

Answer 22

turbellaria

Question 23

shows a great ability to regenerate if cut in pieces, growing a new head or tail as needed

Answer 23

planarians

Question 24

their excretory system made of tubules connected to excretory pores

Answer 24

planarians

Question 25

has ladder-like nervous system composed of nerve cords cerebral ganglia and eyespots

Answer 25

planarians

Question 26

internal parasites are called

Answer 26

tapeworms

Question 27

they are internal parasites

Answer 27

tapeworms

Question 28

they do not have a digestive system and get their food from absorbing nutrients from their host through their skin

Answer 28

cestodes

Question 29

where do cestodes absorbs nutrients

Answer 29

through their skin

Question 30

most cestodes produce ------

Answer 30

proglottids

Question 31

body segements containing male and female reproductive organs

Answer 31

proglottids

Question 32

how do cestodes fertilize

Answer 32

self or crossed

Question 33

when eggs develop and the proglottids detach and are excreted with feces the eggs are then released in the environment where they can be ingested by

Answer 33

intermediate hosts

Question 34

the one in which sexual reproduction of the parasite occurs

Answer 34

definitive host

Question 35

the larvae metamorphoses in the adult worm and attaches itself to the wall of the intenstine with sets of hooks and suckers forming its

Answer 35

scolex

Question 36

tapeworm infections occur when humans consume

Answer 36

raw or undercooked meat

Question 37

its morphology has a scolex with its 4 sucker and two rows of hooks

Answer 37

Taenia solium

Question 38

they are mostly microscopic ectoparasites usually found on aquatic vertebrates such as fish and frogs

Answer 38

monogenea

Question 39

external parasites

Answer 39

ectoparasites

Question 40

their name reflects the fact that their life cycle does not include an intermediate host

Answer 40

monogenea

Question 41

the mature worms of monogenea are characterized by

Answer 41

haptors

Question 42

it is the posterior attachment structures with hooks, clamps and sucker

Answer 42

haptors

Question 43

they are also known as flukes due to their shape

Answer 43

trematoda

Question 43

they feed on skin and sin secretions of their host causing irritation and swelling

Answer 43

monogenea

Question 44

trematoda are also known as -----

Answer 44

fluke

Question 45

these flatworms are internal parasites with complex life cycle with at least ------

Answer 45

two hosts

Question 46

two hosts of trematoda

Answer 46

a vertebrate and a snail or mollusk

Question 47

they typically display two suckers

Answer 47

trematoda

Question 48

location of trematodas two suckers

Answer 48

one near the mouth and the other close to the center of the underside of the animal for attachmet

Question 49

are named and classified according to the organ system they infect or the environment they are ofund in

Answer 49

Flukes

Question 50

they belong to the genus schistosoma

Answer 50

blood flukes

Question 51

blood flukes belong to the genus

Answer 51

Schistosoma

Question 52

liver flukes include species of the genus

Answer 52

Fasciola

Question 53

they include species of the genus fasciola

Answer 53

liver flukes

Question 54

they are aceolomates

Answer 54

flatworms