What are the types of flatworms?
There are four major classes of flatworms such as Cestoda (tapeworms), Turbellaria (planarians), Trematoda (flukes), and Monogenea. The class Turbellaria (planarians) is free-living. Cestoda (tapeworms) and Trematoda (flukes) are parasitic. Planarian is also known as Dugesia and lives in freshwater.
What are 3 characteristics of flatworms?
The main characteristics of flatworms (Figure below) include:
- Flatworms have no true body cavity, but they do have bilateral symmetry.
- Flatworms have an incomplete digestive system.
- Flatworms do not have a respiratory system.
- There are no blood vessels in the flatworms.
Why is a flatworm flat?
Flatworms have a flat body because they lack a fluid-filled body cavity. They also have an incomplete digestive system with a single opening. The mesoderm layer allows flatworms to develop muscle tissues so they can move easily over solid surfaces. Flatworms have a concentration of nerve tissue in the head end.
What are the general characteristics of flat worms?
Characteristics: Flatworms are unsegmented worms with a tail and a head end. They are bilaterally symmetrical with a definite upper and lower surface. They have no body cavity or and no specialized respiratory or circulatory organs.
Why flat worms are called Acoelomates?
Flatworms are called acoelomate animals. They do not possess a body cavity or coelom Since there is no body cavity in these animals their body is solid without a perivisceral cavity. 2. This restricts the free movement of internal organs.
Is an example of free-living flat worm?
Introduction. The flatworms of the phylum Platyhelminthes comprise free-living (“Turbellaria”) and obligate parasitic organisms (Monogenea, Digenea, Aspidogastrea, and Cestoda, today grouped in Neodermata).
Which is a free living fresh water flat worm?
Planaria is a free-living freshwater flatworm. Planaria belongs to the class Turbellaria, which mostly contains free-living species.
Which is a free living freshwater flat worm?
At right, a planarian (Dugesia). Planarians are free-living flatworms, and have a much simpler life history. They inhabit freshwater, and are carnivores (even without teeth) or scavengers.
Which of the following is a free living?
Clostridium is a free-living, anaerobic obligate bacteria. Rhodospirillum is an anaerobic and free-living, nitrogen-fixing bacteria. Azotobacter is a free-living and non-symbiotic, heterotrophic bacteria capable of fixing nitrogen.
Is Beijerinckia aerobic or anaerobic?
Beijerinckia is an obligate aerobic bacterium. Beijerinckia Medium is used for the isolation of Beijerinckia species (1).
Which of the following is aerobic free living?
Azotobacter is a free living, aerobic non-photosynthetic, i.e., sapropytic bacteria.it retains the capability of fixing atmospheric nitrogen, i.e., fixation of atmospheric dinitrogen into ammonia.
What is the role of Leghemoglobin?
Leghemoglobin is shown to buffer the concentration of free oxygen in the cytoplasm of infected plant cells to ensure the proper function of root nodules.
Is azospirillum free living aerobic?
Azospirillum: Azospirilla is Gram-negative free-living nitrogen-fixing rhizosphere bacteria. It is non- photosynthetic. They can grow in aerobic, microaerobic, and anaerobic conditions.