Flatworms have no true body cavity, but they do have bilateral symmetry. Due to the lack of a body cavity, flatworms are known as acoelomates.
- 1 Do flatworms have bilateral symmetry?
- 2 Is a flatworm radial?
- 3 Are flatworms radial symmetry?
- 4 Are Planaria radial or bilateral symmetry?
- 5 Are flatworms decomposers?
- 6 Why do flatworms have bilateral symmetry?
- 7 What is flatworm symmetry?
- 8 Do flatworms have tentacles?
- 9 Do flatworms have exoskeletons?
- 10 Do flatworms have tissues?
- 11 How do flatworms look?
- 12 Do flatworms have appendages?
- 13 Which of these are flatworms?
- 14 Do flatworms have a complete digestive system?
- 15 Is Planaria a flatworm or roundworm?
- 16 Which type of symmetry is seen in Chordata?
- 17 Are flatworms heterotrophic or autotrophic?
- 18 Is a flatworm a secondary consumer?
- 19 Which system in flatworms remains primitive?
- 20 What type of symmetry does this worm have?
- 21 Is a worm a consumer or decomposer?
- 22 Are flatworms dioecious?
- 23 What are the general characteristics of flatworms?
- 24 Are birds asymmetry radial or bilateral?
- 25 What class is a worm?
- 26 What is the pharynx and how does the flatworm use it?
- 27 Do flatworms have cuticle?
- 28 What type of skeleton do flatworms have?
- 29 Do flatworms poop?
- 30 What are the three classes of flatworms?
- 31 Do flatworms have antennae?
- 32 Why dont flatworms have a circulatory system?
- 33 Why does flatworms have no digestive system?
- 34 Where do you find flatworms?
- 35 Which of the following accurately describe bilateral flatworms?
- 36 What type of reproduction do flatworms have?
- 37 Are flatworms Colonial?
- 38 Do flatworms have a nervous system?
- 39 Does the planarian have a complete or incomplete digestive system?
- 40 Which statement is true about both flatworms and roundworms?
- 41 What is the difference between flatworms and roundworm?
- 42 What type of symmetry does planarian have?
- 43 Are echinoderms bilaterally symmetrical?
- 44 Are arthropods radial or bilateral?
- 45 Do all Chordata have bilateral symmetry?
- 46 Are flatworms prokaryotic or eukaryotic?
- 47 Are flatworms unicellular or multicellular?
- 48 How do flatworms maintain homeostasis?
- 49 Are flatworms bilaterally symmetrical?
- 50 What type of symmetry do flatworms have?
- 51 Do tapeworms have a circulatory system?
- 52 Do flatworms have radial symmetry?
- 53 Do flatworms have tissues?
- 54 Do flatworms have exoskeletons?
Do flatworms have bilateral symmetry?
Flatworms are bilaterally symmetrical with a defined head and tail region and a centralized nervous system containing a brain and nerve cords. Clusters of light-sensitive cells make up eyespots on either side of the head.
Is a flatworm radial?
Flatworms were the first animals that had bilateral symmetry, instead of radial symmetry like a hydra, or no symmetry at all like a sponge.
Are flatworms radial symmetry?
3. Unlike, the animals in the Phylum Cnidaria which have radial symmetry, those in the Phylum Platyhelminthes have bilateral symmetry. This means there is only one plane of symmetry (one way you can slice the animal in half and produce two pieces that are mirror images of one another).
Are Planaria radial or bilateral symmetry?
Planarians have three tissue layers (shown above) and are bilaterally symmetrical. Bilaterally symmetrical objects can be divided into identical right and left halves, like a shovel. Flatworms can move in several ways. For example, using cilia on its ventral surface, the planarian slides about in search of food.
Are flatworms decomposers?
Since most flatworms are parasitic in nature, they are mostly responsible for sickness or disease. However, some free-living flatworms do help the environment by acting as decomposers.
Why do flatworms have bilateral symmetry?
Flatworms have no true body cavity, but they do have bilateral symmetry. 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.
What is flatworm symmetry?
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.
Do flatworms have tentacles?
Some flatworms have tiny tentacles over their heads. Most of the commonly seen flatworms only have pseudotentacles on their heads, a pair of tiny ear-like structures made out of folded edges of their bodies. They are not real tentacles like those of a snail.
Do flatworms have exoskeletons?
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.
Do flatworms have tissues?
The flatworms are acoelomate triploblasts—i.e., they lack a body cavity and have three embryonic tissue layers: endoderm, mesoderm, and ectoderm. Also, they are unsegmented, and the bulk of their body is occupied by mesenchyme.
How do flatworms look?
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.
Do flatworms have appendages?
They are characterized by a segmented body and jointed appendages. In the basic body plan, a pair of appendages is present per body segment. Within the phylum, classification is based on mouthparts, number of appendages, and modifications of appendages.
Which of these are flatworms?
The phylum consists of four classes: Trematoda (flukes), Cestoda (tapeworms), Turbellaria (planarians), and Monogenea. It should be noted that some authorities consider Monogenea, which contains the order Aspidogastrea, to be a subclass within the class Trematoda.
Do flatworms have a complete digestive system?
Physiological Processes of Flatworms
Most flatworms have a gastrovascular cavity rather than a complete digestive system; in such animals, the “mouth” is also used to expel waste materials from the digestive system. Some species also have an anal opening. The gut may be a simple sac or highly branched.
Is Planaria a flatworm or roundworm?
planarian, (class Turbellaria), any of a group of widely distributed, mostly free-living flatworms of the class Turbellaria (phylum Platyhelminthes).
Which type of symmetry is seen in Chordata?
Chordates are bilaterally symmetrical, which means there is a line of symmetry that divides their body into halves that are roughly mirror images of each other. Bilateral symmetry is not unique to chordates.
Are flatworms heterotrophic or autotrophic?
Flatworms are free-living heterotrophs or parasites.
Is a flatworm a secondary consumer?
This level includes both herbivores and carnivores: nematodes, protozoa, rotifers, soil flatworms, springtails, some types of mites, and feather-winged beetles.
Which system in flatworms remains primitive?
Flatworms lack a circulatory system but possess a primitive excretory system (protonephridia) and an array of secretory organs that aid in digestion, protection from predators, locomotion, prey capture and the prevention of desiccation in terrestrial environments.
What type of symmetry does this worm have?
Worms are invertebrate animals with bilateral symmetry.
Is a worm a consumer or decomposer?
Worms are part of a special group of species that eat dead or decaying organic matter. They are called decomposers. Decomposers are very important in our food chain, because they recycle the energy, and help us to start all over again!
Are flatworms dioecious?
Are flatworms monoecious or dioecious? There are monoecious hermaphrodite flatworms, such as planaria and taenias, as well as dioecious (having male and female specimens) species, such as schistosomes.
What are the general characteristics of flatworms?
Attribute | Cnidarians and Ctenophores | Platyhelminthes (flatworms) |
---|---|---|
Bilateral symmetry | No | Yes |
Number of main cell layers | Two, with jelly-like layer between them | Three |
Distinct brain | No | Yes |
Specialized digestive system | No | Yes |
Are birds asymmetry radial or bilateral?
Bilateral symmetry is characteristic of the vast majority of animals, including insects, fishes, amphibians, reptiles, birds, mammals, and most crustaceans. Male moose in Jackson, Wyoming. Heliconius butterfly in South America. The body has one pair of symmetrical sides.
What class is a worm?
Both worms and insects are classified under the Kingdom Animalia. The animal kingdom is split into two groups: vertebrate, animals with a backbone, and invertebrate, animals without a backbone. Both worms and insects are invertebrates.
What is the pharynx and how does the flatworm use it?
Pharynx: a muscular tube through which the flatworm can suck food into its gastrovascular cavity. The opening into the pharynx could be considered the mouth, but since this animal has a two-way gut, that opening also must function as the anus.
Do flatworms have cuticle?
Outer Covering
Flatworms: Flatworms lack a cuticle. The body of Platyhelminthes often contains cilia. Roundworms: Roundworms consist of a hard outer covering called cuticle.
What type of skeleton do flatworms 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 flatworms poop?
Flatworms have an excretory system with a network of tubules throughout the body that open to the environment and nearby flame cells, whose cilia beat to direct waste fluids concentrated in the tubules out of the body.
What are the three classes of flatworms?
Phyla Platyhelminthes and Nemertea. The Platyhelminthes includes three classes: the Turbellaria (free-living flatworms), the Trematoda (flukes), and the Cestoda (tapeworms).
Do flatworms have antennae?
Flatworms are non-parasitic, free-living animals. Their bodies are more or less flattened ovals that vary from one to five inches (2.54 to 12.7 cm) in length. There are two small sensory organs on the forward ends of the bodies that look similar to cat ears and that function as antennae.
Why dont flatworms have a circulatory system?
There is no need for a special circulatory system as a human has because the flatworm doesn’t breathe with lungs and doesn’t need to transport oxygen around its body. The flatworm simply diffuses oxygen via its skin. This occurs wherever it may need the oxygen.
Why does flatworms have no digestive system?
Because they don’t have a body cavity, flatworms are considered acoelomates. They have simple digestive systems, with mouths to take in food and long digestive tracts to diffuse it around the body. Most flatworms take in food via their mouth, then move it into a digestive gut that attaches to the digestive structures.
Where do you find flatworms?
- 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.
Which of the following accurately describe bilateral flatworms?
Which of the following accurately describe bilateral flatworms? They have dorsoventrally flattened bodies.
What type of reproduction do flatworms have?
Two marine flatworms jab each other to inject sperm. The one that gets injected becomes the female and nourishes the developing fertilized eggs.
Are flatworms Colonial?
The trematode flatworms, or flukes, are so simple that they have no blood vessels or special breathing organs. They have only one opening to their bodies, so their mouth is also their anus. They usually live solitary lives but once a larva infects a host, it repeatedly clones itself to form a colony.
Do flatworms have a nervous system?
The bilaterally flattened body of flatworms preserves a common organization of the central nervous system (CNS). The CNS of flatworms consists of: (i) the orthogon, composed of main longitudinal nerve cords and transverse commissures that form a ladder-like network.
Does the planarian have a complete or incomplete digestive system?
Most flatworms, such as the planarian shown in Figure 1, have a gastrovascular cavity rather than a complete digestive system. In such animals, the “mouth” is also used to expel waste materials from the digestive system. Some species also have an anal opening. The gut may be a simple sac or highly branched.
Which statement is true about both flatworms and roundworms?
Which is true of both flatworms and roundworms? They both have radial symmetry.
What is the difference between flatworms and roundworm?
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. |
What type of symmetry does planarian have?
The planarian is the simplest living animal having a body plan of bilateral symmetry and cephalization. The brain of these free-living flatworms is a bilobed structure with a cortex of nerve cells and a core of nerve fibres including some that decussate to form commissures.
Are echinoderms bilaterally symmetrical?
Echinoderms are marine invertebrates. They include sea stars, sand dollars, and feather stars. Echinoderms have a spiny endoskeleton. They have radial symmetry as adults but bilateral symmetry as larvae.
Are arthropods radial or bilateral?
Arthropods are bilaterally symmetrical, meaning their left and right halves are mirror-images of each other — humans, dogs, cats, fish and many other types of animals display bilateral symmetry.
Do all Chordata have bilateral symmetry?
All chordates share four common characteristics: a nerve cord, a notochord, pharyngeal slits, and a postanal tail. Chordates, including humans, are also all classified as having bilateral symmetry and can be divided into a left and right side.
Are flatworms prokaryotic or eukaryotic?
Kingdom: Animalia – Flatworms fall under the animal kingdom that is characterized by multicellular eukaryotic organisms.
Are flatworms unicellular or multicellular?
The flatworms, like the sponges (Phylum Porifera) and Phylum Cnidaria (Hydra, jellyfish, corals, and sea anemones) are multicellular. However, the flatworms are more complex in structure than either of the two other groups.
How do flatworms maintain homeostasis?
Flatworms have two tubular excretory organs that excrete wastes as well as maintaining the homeostasis of its salt to water ratio. It works by using flame cells located on the edges of the tubules to propel water and waste with tiny cilia through the tubules and out of the body.
Are flatworms bilaterally symmetrical?
B140: Flatworms. Flatworms and nearly all other animals from here on are bilaterally symmetrical (right and left halves are mirror images). The front end of such animals usually forms a distinct head. However, flatworms still have a single all-purpose cavity with only one opening.
What type of symmetry do flatworms have?
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.
Do tapeworms have a circulatory system?
The body covering is a tough cuticle, through which food is absorbed. There is neither a mouth nor a digestive tract. Tapeworms also lack a circulatory system and an organ specialized for gas exchange. Most tapeworms are hermaphroditic (i.e., functional reproductive organs of both sexes occur in the same individual).
Do flatworms have radial symmetry?
In contrast to radially symmetrical animals such as cnidarians, flatworms, like most other animals, are bilaterally symmetrical. An animal with bilateral symmetry has mirror-image right and left sides.
Do flatworms have tissues?
The flatworms are acoelomate triploblasts—i.e., they lack a body cavity and have three embryonic tissue layers: endoderm, mesoderm, and ectoderm. Also, they are unsegmented, and the bulk of their body is occupied by mesenchyme.
Do flatworms have exoskeletons?
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.