Platyhelminthes

Question 1

Phylum Platyhelminthes
They are … and have …. that make them to be classified as flatworms. They are
….

Answer 1

Phylum Platyhelminthes
They are flatworms and have characteristic features that make them to be classified as flatworms. They are multicellular.

Question 2

Characteristics Of Platyhelminthes

In terms of germ layer & symmetry
In terms of ends
In terms of flattening and the name’s meaning.
In terms of the anterior region
In terms of the epidermis
In terms of muscles

Answer 2

-They are triploblastic(three germ layers) and bilaterally symmetrical
-There is presence of a defined posterior and anterior end therefore there is centralisation
-Their body is dorso-ventrally flattened hence the name Platyhelminthes meaning flatworms.
The anterior region has an oral sucker and a ventral sucker (which can be located anywhere)
-The epidermis(outer layer) is ciliated in some species and some contain in a specie known as turbellaria
-They have muscles(circular and longitudinal)

Question 3

Characteristics Of Platyhelminthes

In terms of internal cavity
In terms of nervous system
In terms of excretory system
In terms of eye spots
In terms of body systems

Answer 3

-They have no internal space so they are referred to as aceolomates
-They have a nervous system which consists of a pair of anterior ganglia
-They also have an excretory system(known as proto-nephridia system) made up of flame cells
-Eye spots are present in some species
-Absence of respiratory, circulatory & skeletal system

Question 4

Characteristics Of Platyhelminthes

In terms of sexes
In terms of gonads & life cycle
In terms of lifestyle

Answer 4

-Most of them are monoecious and are hermaphrodites
-They have well developed gonads for some of the species, they have a direct life cycle while most of them have an indirect communicated life cycle
-Flatworms include both free-living and parasitic worms

Question 5

Class Cestodes

Major example

Characteristics
In terms of body description
In terms of body division
In terms of lifestyle

Answer 5

Tapeworms

Contains flattened long and tape like organisms
Their bodies are divided.
They are usually found parasitic in the intestine of vertebrates

Question 6

Class Trematoda
Popularly called …, body surface is …,have … for attaching

Answer 6

Class Trematoda
Popularly called flukes, body surface is often ciliated,have suckers for attaching

Question 7

Class turbellaria
Members of the class are …., bodies are …

An example is …

Answer 7

Class turbellaria
Members of the class are free living, bodies are ciliated

An example is planaria

Question 8

PLANARIA ….

This is a common …. which is found in … plants in …. It’s …. in shape like all other …., they have … body layers, they feed on …. The nervous system is ….

Answer 8

PLANARIA DUGESIA
this is a common turbellaria which is found in water plants in ponds. It’s leaf-like in shape like all other flatworms, they have three body layers, they feed on insect larvae. The nervous system is well developed.

Question 8

Class monogenea
Body surface is not …., suckers are …. E…parasites of fish …. and also e…parasites of …. and ….

Answer 8

Class monogenea
Body surface is not ciliated, suckers are present. Ectoparasites of fish gills and also endoparasites of amphibians and birds

Question 9

Classes Of Platyhelminthes

Answer 9

1. Class Turbellaria
2. Class Trematoda
3. Class Monogenia
4. Class Cestoda

Question 10

Other asexual …. methods consists of …..
….. passes out water current and enters into another spore for ….
Sexually, the larva is known as …..
POLYSTOMA is a parasite of … and ….
TREMATODES e.g …., …(liver flukes)found in the … , …. (lung flukes)

Answer 10

Other asexual fission methods consists of budding.
Sperm passes out water current and enters into another spore for reproduction.
Sexually, the larva is known as amphibular larvae
POLYSTOMA
is a parasite of frogs and toads
TREMATODES e.g shistosoma, fasciola(liver flukes)found in the bile ducts , paragonium(lung flukes)