Animalscaretips
- Do Platyhelminthes have bones?
- What type of skeleton does Platyhelminthes have?
- Do Platyhelminthes have vertebrates?
- Do Platyhelminthes have an exoskeleton?
- Where are platyhelminthes found?
- What do platyhelminthes eat?
- Why are platyhelminthes more advanced than cnidarians?
- What makes platyhelminthes unique?
- What type of body cavity do Cnidaria have?
- How do Platyhelminthes breathe?
- Which one of the following is absent in Platyhelminthes?
- Do Platyhelminthes have intracellular or extracellular digestion?
- Which Ecdysozoan has a segmented body plan an exoskeleton and jointed limbs?
- Why are platyhelminthes called Acoelomate?
- Does a nematoda have a skeleton?
Do Platyhelminthes have bones?
They are bilaterally symmetrical (i.e., the right and left sides are similar) and lack specialized respiratory, skeletal, and circulatory systems; no body cavity (coelom) is present.
What type of skeleton does Platyhelminthes have?
Flatworms have a more complex structure than cnidarians but they lack a true coelom. Despite this, they still possess a hydrostatic skeleton. These animals are of a flattened nature and possess muscle cells arranged in layers with a loose packing of cells derived from the mesoderm called mesenchyme.
Do Platyhelminthes have vertebrates?
The flatworms, flat worms, Platyhelminthes, or platyhelminths (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth-, meaning "worm") are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
Do Platyhelminthes have an exoskeleton?
Explanation: Exoskeleton and endoskeleton are absent in members of phylum Platyhelminthes. These are the first group of animals where three primary germ layers develop, i.e. ectoderm, mesoderm and endoderm.
Where are platyhelminthes found?
Most freshwater flatworms are free-living and can be found in ponds, lakes, streams, ditches, and temporary puddles. They live under rocks, plants, and debris to avoid direct sunlight. They can be found on hard and soft substrates, but are more common on the hard surfaces.
What do platyhelminthes eat?
They feed on tunicates, small crustaceans, worms, and molluscs. These flatworms feed like sea stars, extruding their pharynx, which secretes enzymes to digest their prey.
Why are platyhelminthes more advanced than cnidarians?
Flatworms are more complex than cnidarians. Cnidarians have two layers of cells, the ectoderm and the endoderm; flatworms have a middle layer called the mesoderm between the other two layers (Fig. 3.16). ... The cells of the ectoderm and endoderm are also more organized than similar cells of cnidarians.
What makes platyhelminthes unique?
The most distinguishing feature of these invertebrates is their flat body. As the body does not have any cavity, they are flat. The body is also not segmented and they do not have specialized systems. Around eighty percent of the flatworms are parasitic in nature, while a few free-form flatworms are also present.
What type of body cavity do Cnidaria have?
Corals, sea anemones and jellyfish belong to a group of animals called cnidarians. They have a simple body consisting of a central gut cavity surrounded by tentacles. A jelly-like substance called mesoglea lies between the outer and inner layers of the body.
How do Platyhelminthes breathe?
Flatworms are small, literally flat worms, which 'breathe' through diffusion across the outer membrane. The flat shape of these organisms increases the surface area for diffusion, ensuring that each cell within the body is close to the outer membrane surface and has access to oxygen.
Which one of the following is absent in Platyhelminthes?
Explanation: Platyhelminthes or commonly known as ''flatworms'' do not have anus present. They have an incomplete alimentary canal, having a single opening representing the mouth. A separate pore for the anus is absent.
Do Platyhelminthes have intracellular or extracellular digestion?
Platyhelminthes have incomplete digestive system i.e they have only one opening (mouth) and lack anus. They posses both extracellular and intracellular types of digestion. They food is taken into gastrovascular cavity where enzymes are released. The enzymes break down food into simpler form.
Which Ecdysozoan has a segmented body plan an exoskeleton and jointed limbs?
Arthropods represent the most successful phylum of animals on Earth, in terms of number of species as well as the number of individuals. They are characterized by a segmented body and jointed appendages.
Why are platyhelminthes called Acoelomate?
Due to the lack of a body cavity, flatworms are known as acoelomates. Flatworms have an incomplete digestive system. This means that the digestive tract has only one opening.
Does a nematoda have a skeleton?
Roundworms make up the phylum Nematoda. Roundworms have a pseudocoelom and hydrostatic skeleton. Their body is covered with tough cuticle. Free-living roundworms are found mainly in freshwater habitats.
