Platyhelminthes

Question 1

What are Platyhelminthes?

Answer 1

The flatworms are free living or parasitic dorsoventrally flattened acoelomate worms

Question 2

Specific features of Platyhelminthes are

Answer 2

Triploblastic acoelomate
Bilaterially symmetrical
Dorsoventrally flattened
Complex though incomplete gut
No blood vascular and respiratory systems
They possess a unique system of branched rotonepheridial tube that ends in the flame cell.

Question 2

Specific features of Platyhelminthes are

Answer 2

Triploblastic acoelomate
Bilaterially symmetrical
Dorsoventrally flattened
Complex though incomplete gut
No blood vascular and respiratory systems
They possess a unique system of branched rotonepheridial tube that ends in the flame cell
They are monoecious
The gut when present has only one opening
There is no anus

Question 3

An example of coelomate

Answer 3

Earthworm

Question 4

Example of pseudocoelomate

Answer 4

Roundworms

Question 5

Example of pseudocoelomate

Answer 5

Roundworms

Question 6

Example of coelomate

Answer 6

Planarians

Question 7

What are the advancement

Answer 7

Triploblastic organisation 
Bilateral symmetry 
Cephalization
Tend towards centralization 
Well developed organ-systems

Question 8

How many clsass is platyhelminthes divided into

Answer 8

4

Question 9

What are the 4 classes platyhelminthes

Answer 9

Turbellaria
Trematoda
Momogenea
Cestooda

Question 10

State the characteristics of turbellaria

Answer 10

They have non-parasitic free-living faltworms with leaf-like body
Epidermal layer of multiciliated cells that covers the body
They have no true suckers
Presence of subepidermal rhabdites from which mucus is derived.

Question 11

Turbellaria have no true suckers. True or false

Answer 11

True

Question 12

Where is mucus derived

Answer 12

Rhabdites

Question 13

What covers the body of turbellarias

Answer 13

Epidermal layer of multiciliated cells

Question 14

Characteristics of monogenea

Answer 14

They are parasitic with only one host
Body covered with tegument
Oral suckers reduced or absent
Acetabulum absent
They have anterior prohaptor and large posterior opisthaptor which bears suckers and hooks used as attachment organs
They are endoparasite of marine vertebrates especially fishes and amphibians and feed on epithelial cells and blood.
There is no intermediate host and only one egg produce only one adult worm.
They are monoecious and usually undergo reciprocal insemination.
The zygote develop into ciliated oncomiracidium larva.

Question 15

Monogenea are_____________flatworms with___________host

Answer 15

Parasitic

Single

Question 16

In monogenea body is covered by

Answer 16

Tegument

Question 17

In monogenea body is covered by

Answer 17

Tegument

Question 18

Oral sucker and Acetabulum is

Answer 18

Absent

Question 19

Oral sucker and Acetabulum is

Answer 19

Absent

Question 20

They have_______________ and large___________which bears ________and_________used as _____________

Answer 20

Anterior prohaptor
Posterior opisthaptor
Suckers and hooks
Attachment organs

Question 21

They are mostly endoparasite of________________especially_____________and feed on_______________ and_________.

Answer 21

Marine vertebrates
Fishes and amphibians
Epithelial cells
Blood

Question 22

There is no____________and______egg gives rise to _____________

Answer 22

Intermediate host
One
Only one adult worm

Question 23

They are_______________ and usually undergo___________

Answer 23

Monoecious

Reciprocal insemination

Question 24

The zygote develop into______________

Answer 24

Ciliated oncomiracidium larva