When comparing roundworms and flatworms which is true?

Last Update: April 20, 2022

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Asked by: Augustine Weber
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A flatworm has a thin, dorsoventrally flattened body. Roundworms are more cylindrical in shape and tapered to a fine point at one end. Similarly, roundworms have a rigid outer covering called a cuticle that they shed repeatedly throughout their lives and as they grow.

Which statement is true about both flatworms and roundworms?

Flatworms are pseudocoelomates, meaning they lack an internal body cavity. Which is true of both flatworms and roundworms? They both have radial symmetry. They both have bilateral symmetry.

What do roundworms and segmented worms have in common quizlet?

What characteristics do roundworms have? They have a cylindrical body, look like tiny spaghetti, digestive system like a tube. What characteristics do segmented worms have? They have long, narrow bodies, with many linked sections.

Are roundworms that do not have circular muscle quizlet?

Describe the movement of roundworms. Thrashing movement. The do not have circular muscles, they have only muscles that run the length of their body; therefore, they thrash.

What do flatworms and roundworms have in common?

Flatworms' bodies are flat and as soft as jelly. Some common ones are planarians, flukes, and tapeworms. ... Unlike flatworms or cnidarians, roundworms have a tube-like digestive system that has two openings. Food enters through a mouth and wastes exit the other end of the digestive system.

Flatworms: Simple Wiggly Tubes

33 related questions found

Do roundworms have a nervous system?

Roundworms also have a simple nervous system with a primitive brain. There are four nerves that run the length of the body and are connected from the top to the bottom of the body. At the anterior end of the animal (the head region), the nerves branch from a circular ring which serves as the brain.

What characteristic do all worms have in common?

Characteristics. All worms are bilaterally symmetrical, meaning that the two sides of their bodies are identical. They lack scales and true limbs, though they may have appendages such as fins and bristles. Many worms have sense organs to detect chemical changes in their environments, and some have light-sensing organs.

Do flatworms have setae?

Flatworms do not have this; their bodies, instead, are covered with cilia, hairlike growths. The gliding locomotion of a flatworm is powered by many tiny cilia on the outer surface of its body.

Do segmented worms have sense organs?

Worms are primitive creatures with no limbs, eyes or ears to provide them with sensory information about their environment. They have sensory receptors in their skin that are sensitive to vibrations, touch, chemicals and light.

What diseases do flatworms cause?

Paragonimiasis is caused by infection with a flatworm. That's a parasitic worm also called a fluke or lung fluke because it commonly infects the lungs. Usually, infection comes after eating undercooked crab or crayfish that carry immature flukes.

Which diseases are caused by roundworms?

Parasitic Roundworm Diseases
  • Ascariasis.
  • Hookworm Disease.
  • Pinworm Infection.
  • Strongyloidiasis.
  • Trichinosis.
  • Whipworm Disease.

What do flatworms look like?

Flatworms have flat, symmetrical, leaf-shaped bodies that grow to a size smaller than a quarter. The oyster flatworm is cream-colored with short tentacles on its sides and has eyespots in two rows along its head.

What is the body type of flatworms?

Flatworms' bodies are bilaterally symmetrical and they have a defined head and tail region. They have a central nervous system containing a brain and a nerve cord. Clusters of light-sensitive cells on either side of their head make up what are called eyespots.

Which describes the movement of a roundworm?

Describe roundworm movement. - Causes their bodies to move in a thrashing manner as one muscles contract and the other relaxes. - These muscles also pull against the outside body wall and other pseuocoelom. ... Many humans diseases related to parasitic roundworms can be attributed to three things.

How do flatworms accomplish respiration?

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.

Is a flatworm a parasite?

Flatworm, also called platyhelminth, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. A number of flatworm species are free-living, but about 80 percent of all flatworms are parasitic—i.e., living on or in another organism and securing nourishment from it.

Is an earthworm a roundworm?

Key difference: Earthworms, Tapeworms and Roundworms are long and cylindrical shaped worms. ... Accordingly, an earthworm is a round and cylindrical shaped worm, which survives under ground in the soil. Tapeworms and roundworms are parasitic worms, which are known to cause infections in animal bodies (including humans).

Do flatworms have a complete digestive system?

Like the cnidarians, flatworms have a digestive system with only a single opening into the digestive cavity, but in independently living marine flatworms the cavity branches into all parts of the body (Fig. 3.37 B). These flatworms feed through a pharynx.

What are 3 characteristics of worms?

The three main groups of worms are flatworms, roundworms, and segmented worms. Worms are invertebrates because they do not have a backbone. Worms have bilateral symmetry. Worms have cells, tissues, organs, and systems.

What are the 5 characteristics of earthworm?

Earthworm Phylum Characteristics
  • Metamerism. All annelid bodies are divided serially into segments called metameres. ...
  • Body Wall. The body wall has an outer circular muscle layer and inner longitudinal muscle layer. ...
  • Chitinous setae. ...
  • Coelom. ...
  • Closed Circulatory System. ...
  • Complete Digestive System. ...
  • Respiration. ...
  • Excretory System.

Can roundworms get in your brain?

Roundworm Symptoms and Risks

“From the lung, the worm can occasionally travel to the eyes, leading to vision loss. Or it may go to the brain where it can cause encephalitis, which leads to seizures and brain damage.”

What are the features of body shape in roundworms?

Roundworms (nematodes) are bilaterally symmetrical, worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle. Their body plan is simple. The cuticle is secreted by and covers a layer of epidermal cells.

Do roundworms have a muscular system?

Roundworms have obliquely striated, longitudinal muscle but no circular muscle. They are enclosed in a thick cuticle that allows bending but prevents swelling. Therefore, contraction of the longitudinal muscle can only bend the body.