Table of Contents
- 1 What is the scientific name for planarian?
- 2 Why Planaria is called flatworm?
- 3 Why is class trematoda and class cestoda called parasitic worms?
- 4 Why are Planaria used for research?
- 5 How does the position of the mouth differ between the planarian the tapeworm and the fluke?
- 6 Which of the following is a correct difference between flatworms and roundworms?
What is the scientific name for planarian?
planarian, (class Turbellaria), any of a group of widely distributed, mostly free-living flatworms of the class Turbellaria (phylum Platyhelminthes). Planaria is the name of one genus, but the name planarian is used to designate any member of the family Planariidae and related families.
Why Planaria is called flatworm?
A planarian is one of many flatworms of the traditional class Turbellaria. It usually describes free-living flatworms of the order Tricladida (triclads), although this common name is also used for a wide number of free-living platyhelminthes. Planaria exhibit an extraordinary ability to regenerate lost body parts.
What is the name of the structure that a planarian uses to feed?
Planarians ingest food through a tube called the pharynx, which is usually kept inside their body. During feeding, this tube extends out of the planarian’s ventral midsection.
Why is class trematoda and class cestoda called parasitic worms?
Trematodes, commonly called flukes, are parasitic worms of the taxonomic class Trematoda. Both cestodes and trematodes are hermaphroditic and oviparous (egg-laying). Cestodes are tape-like and segmented in shape, have a head with suckers and possibly hooks, and lack a digestive tract.
Why are Planaria used for research?
Planarians are used in many kinds of research, in part because they have some fascinating characteristics relating to reproduction, regeneration, and cell memory. Research attributes these amazing regenerative abilities to the retention of pluripotent stem cells, which can grow back into anything.
What is a planarian worm?
Planaria (Platyhelminthes) are free-living flatworms that live in freshwater. They are typically found under rocks and debris in streams, ponds, and springs. First, planarians have bilateral symmetry with two nerves extending the length of the body, an enlarged “brain” (ganglion cell), and two eye spots. …
How does the position of the mouth differ between the planarian the tapeworm and the fluke?
A planarian’s mouth is located in the center of the organism on the underside of its belly. Tapeworms have no mouth and absorb nutrients directly. And a fluke’s mouth is located within the anterior sucker on the ventral side.
Which of the following is a correct difference between flatworms and roundworms?
Note: Both flatworms and roundworms can be parasitic or free living….What is the difference between flatworms and roundworms?
| Flatworms | Roundworms |
|---|---|
| They do not have a body cavity and thus are acoelomates. | They are pseudocoelomates i.e. they have a body cavity between their mesoderm and endoderm layers. |
How do the flatworms roundworms and segmented worms differ from each other?
Flatworms, which have ribbon-like bodies with no body cavity. Roundworms, which have a body cavity but no segments. Segmented worms, which have both a body cavity and segmented bodies.