multicellular animals
- 1 Does Cnidaria have body cavity?
- 2 What type of body cavity does Cnidaria have?
- 3 What animals have no coelom?
- 4 Do insects have a coelom?
- 5 Do all cnidarians have nematocysts?
- 6 What do cnidarians have in place of a brain?
- 7 Do cnidarians have an endoderm?
- 8 Do cnidarians have Cephalization?
- 9 Do cnidarians have symmetry?
- 10 What type of reproduction do cnidarians have?
- 11 What are the characteristics of phylum Cnidaria?
- 12 Is Arthropoda a Coelomate?
- 13 Is a cnidarian a Coelomate or Acoelomate?
- 14 What type of coelom do arthropods have?
- 15 What is coelom based on nature of coelom how animals are classified?
- 16 Do cnidarians have endoderm and ectoderm?
- 17 Why do cnidarians have diffused nervous system?
- 18 Are sexes separate in Cnidaria?
- 19 How do cnidarians form colonies?
- 20 Where are nematocysts located on a cnidarians body?
- 21 Are cnidarians Diploblastic?
- 22 Do cnidarians have nervous tissue?
- 23 How are cnidarians separated into groups?
- 24 Do cnidarians have spicules?
- 25 Are cnidarians carnivores?
- 26 Does Cnidaria have segmentation?
- 27 What type of symmetry are characteristics of cnidarians?
- 28 Do cnidarians bones?
- 29 How many openings do cnidarians have?
- 30 Do Cnidaria have well defined tissues?
- 31 Are Cnidaria bilateral symmetry?
- 32 Are cnidarians external fertilization?
- 33 Are cnidarians motile?
- 34 What is a cnidarians habitat?
- 35 Are flatworms coelom?
- 36 What characteristics of phylum Cnidaria are most important in distinguishing it from other phyla?
- 37 What are 3 characteristics that all cnidarians have in common?
- 38 Do vertebrates have coelom?
- 39 Do arthropods have jointed appendages?
- 40 Do arthropods have muscles?
- 41 What are salient features of Arthropoda?
- 42 What is body cavity in arthropods?
- 43 Which organism has true coelom?
- 44 Which of the following does not have a true coelom?
- 45 When the animals are called coelomates?
- 46 Do all cnidarians have nematocysts?
- 47 Do Cnidaria have muscles?
- 48 Do cnidarians have exoskeleton?
- 49 What do the nerve cells of cnidarians make up?
- 50 How do cnidarians and echinoderms function and perform behaviors without having a brain?
- 51 Do cnidarians have a brain?
- 52 What type of reproduction do cnidarians have?
- 53 How do nematocysts work for cnidarians?
- 54 How do cnidarians use their tentacles Brainly?
Does Cnidaria have body cavity?
A cnidarian’s body is diploblastic, with two cell layers of the body wall separated by mesoglea, and shows radial symmetry. The body cavity (gastrovascular cavity) is sac-shaped, with one opening acting as both mouth and anus. This opening is surrounded by tentacles bearing thread cells.
What type of body cavity does Cnidaria have?
Cnidarian bodies have two or sometimes three layers. A gastrovascular cavity (coelenteron) has a single exterior opening that serves as both mouth and anus. Often tentacles surround the opening.
What animals have no coelom?
Animals that do not have a coelom are called acoelomates. Flatworms and tapeworms are examples of acoelomates. They rely on passive diffusion for nutrient transport across their body.
Do insects have a coelom?
A true coelom arises entirely within the mesoderm germ layer. Animals such as earthworms, snails, insects, starfish, and vertebrates are all eucoelomates. A third group of triploblasts has a body cavity that is derived partly from mesoderm and partly from endoderm tissue. These animals are called pseudocoelomates.
Do all cnidarians have nematocysts?
Nematocysts or cnidocysts represent the common feature of all cnidarians. They are large organelles produced from the Golgi apparatus as a secretory product within a specialized cell, the nematocyte or cnidocyte.
What do cnidarians have in place of a brain?
Although cnidarians are essentially floating nerve nets, with no true brains, they possess ganglia to coordinate nerve messages along the body. Cnidarians lack specific response to external stimuli, such as detecting what direction a stimulus is coming from.
Do cnidarians have an endoderm?
Cnidarians consist of two cell layers: an outer ectoderm and an inner endoderm (the gastrodermis) that lines the coelenteron.
Do cnidarians have Cephalization?
Cnidarians are radially symmetrical (i.e., similar parts are arranged symmetrically around a central axis). They lack cephalization (concentration of sensory organs in a head), their bodies have two cell layers rather than the three of so-called higher animals, and the saclike coelenteron has one opening (the mouth).
Do cnidarians have symmetry?
Radial symmetry (sort of)
Another important characteristic of some cnidarians is that they have bodies with nearly radial symmetry.
What type of reproduction do cnidarians have?
Cnidarians reproduce both sexually and asexually. Some species can produce both eggs and sperm in the same organism. These organisms are called simultaneous hermaphrodites and release gametes into the ocean in egg-sperm bundles. Some species are also either male or female and produce either eggs or sperm.
What are the characteristics of phylum Cnidaria?
- They are characterized by stinging cells called Cnidoblast and a cavity called coelenterates, justifying the name Cnidaria or Coelenterata.
- They are exclusively aquatic and marine.
- They are radially symmetrical and diploblastic animals.
Is Arthropoda a Coelomate?
Arthropods are coelomate animals, although the coelom no longer functions as a hydrostatic skeleton, as it does in the less-evolved annelid worms. Instead, it persists as a cavity that typically just surrounds the reproductive and/or excretory organs.
Is a cnidarian a Coelomate or Acoelomate?
Yes, animals of the phylum Porifera and Cnidaria are acoelomates. They do not possess a body cavity, which is lined by mesoderm. Also Check: Coelom.
What type of coelom do arthropods have?
Similar to annelids, arthropods are coelomates with a true coelom, or body cavity. However, in arthropods the coelom is reduced to a small compartment surrounding the reproductive and excretory organs.
What is coelom based on nature of coelom how animals are classified?
Coelom is a fluid-filled cavity between the body wall and gut wall. It is lined by mesoderm. On the basis of the presence or absence of coelom, animals are classified into three groups, namely coelomates and pseudocoelomates and acoelomates. Coelomate animals possess coelom between the body wall and digestive tract.
Do cnidarians have endoderm and ectoderm?
Cnidarian Germ Layers
In the case of cnidarians there are two layers: the endoderm and the ectoderm. The endoderm is the inner layer (‘endo’ for ‘within’), and the ectoderm is the outer layer (‘ecto’ for ‘outer’).
Why do cnidarians have diffused nervous system?
Answer: Because pin the cnidarian body, the nerve net serves as a sensory locator neuron cell stretch all around the animals body and allow the cnidarian to detect chemical change ,to capture prey, and to move in response to stimulus.
Are sexes separate in Cnidaria?
Cnidarians have separate sexes and many have a lifecycle that involves two distinct morphological forms—medusoid and polypoid—at various stages in their life cycles. In species with both forms, the medusa is the sexual, gamete-producing stage and the polyp is the asexual stage.
How do cnidarians form colonies?
These colonies form by asexual reproduction in which the developing bud forms a polyp that remains attached to the parent. In addition to the hydrostatic skeleton discussed above, several coral species secrete an exoskeleton.
Where are nematocysts located on a cnidarians body?
Cnidarians contain specialized cells known as cnidocytes (“stinging cells”) containing organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, and serve to immobilize prey with toxins contained within the cells.
Are cnidarians Diploblastic?
Cnidarians are generally regarded as diploblastic animals, possessing endoderm and ectoderm, but lacking mesoderm.
Do cnidarians have nervous tissue?
Cnidarians have simple nervous systems and it was probably within this group or a closely-related ancestor that nervous systems first evolved.
How are cnidarians separated into groups?
Modern cnidarians are generally classified into four main classes: sessile Anthozoa (sea anemones, corals, sea pens); swimming Scyphozoa (jellyfish) and Cubozoa (box jellies); and Hydrozoa, a diverse group that includes all the freshwater cnidarians as well as many marine forms, and has both sessile members such as …
Do cnidarians have spicules?
Sponges are unsymmetrical or radially symmetrical, with many cell types but no distinct tissues; their bodies contain numerous pores and sharp protective spicules. Coelenterates (phylum Cnidaria) are radially symmetrical, with two tissue layers (ectoderm and endoderm) surrounding an all-purpose gastrovascular cavity.
Are cnidarians carnivores?
All cnidarians are carnivores. Most use their cnidae and associated toxin to capture food, although none is known actually to pursue prey. Sessile polyps depend for food on organisms that come into contact with their tentacles.
Does Cnidaria have segmentation?
Taxonomic level: phylum Cnidaria; grade of construction: two tissue layers; symmetry: radial; type of gut: blind gut; type of body cavity other than gut: none; segmentation: none; circulatory system: none; nervous system: network of nerve cells; excretion: diffusion from cell surface.
What type of symmetry are characteristics of cnidarians?
The majority of Cnidarians share the characteristic of radial symmetry. Radial symmetry means symmetry around a center point such that any line drawn through the center of the organism divides the body into mirror images. A jellyfish, for example, viewed from above has radial symmetry.
Do cnidarians bones?
Cnidarians have a hydrostatic skeleton. The contractile fibers act against the fluid-filled gastrovascular cavity. The movements are like a balloon; the animal can be short and thick or long and thin.
How many openings do cnidarians have?
Cnidarians have an incomplete digestive system with only one opening; the gastrovascular cavity serves as both a mouth and an anus.
Do Cnidaria have well defined tissues?
This type of development is known as triploblastic. This is true for almost all animals, but you’ll two exceptions in Bio 6A: the sponges (phylum Porifera), which don’t have well-defined tissues at all, and the phylum Cnidaria (jellyfish, etc.), which form only two embryonic tissue layers (diploblastic development).
Are Cnidaria bilateral symmetry?
The bilateral symmetry of Cnidaria is thought to be inherited from the common ancestors of both cnidarians and triploblastic bilaterians. The secondary radial symmetry of Cnidaria evidently is a result of the adaptation to the sessile mode of life.
Are cnidarians external fertilization?
However, basal animals, such as medusozoan cnidarians (i.e., jellyfish) in which plesiomorphic external fertilization would be expected in adult medusae [2], offer several interesting examples of disparate jellyfish species exhibit- ing internal fertilization.
Are cnidarians motile?
Medusa forms are motile, with the mouth and tentacles hanging down from an umbrella-shaped bell. Cnidarian morphology: Cnidarians have two distinct body plans, the medusa (a) and the polyp (b). All cnidarians have two membrane layers, with a jelly-like mesoglea between them.
What is a cnidarians habitat?
Cnidarians can be found in almost all ocean habitats. They may live in water that is shallow or deep, warm or cold. A few species live in freshwater. Some cnidarians live alone, while others live in colonies. Corals form large colonies in shallow tropical water.
Are flatworms coelom?
Flatworms are hermaphroditic and capable of sexual and asexual reproduction. Their bodies have only a single opening, which serves as both a mouth and an anus. They are, as their name implies, flat. They have no circulatory system or body cavity (coelom), but they do have an excretory and digestive system.
What characteristics of phylum Cnidaria are most important in distinguishing it from other phyla?
What characteristics of Phylum Cnidaria are the most important in distinguishing it from other phyla? They are sessile, radial symmetry, production of nematocysts.
What are 3 characteristics that all cnidarians have in common?
Terms in this set (6)
What are three characteristics that all cnidarian have in common? Cnidarians have an epidermis, gastrodermis, mesoglea, gastrovascular activity and tentacles. Also, they have cnidocytes and a nervous system composed of diffuse web of interconnected nerve cells called a nerve net.
Do vertebrates have coelom?
Most bilateral animals, including all the vertebrates, are coelomates. Pseudocoelomate animals have a pseudocoelom (literally “false cavity”), which is a fluid filled body cavity. Tissue derived from mesoderm partly lines the fluid filled body cavity of these animals.
Do arthropods have jointed appendages?
All arthropods posses an exoskeleton, bi-lateral symmetry, jointed appendages, segmented bodies, and specialized appendages. The major arthropod classes can be separated by comparing their number of body regions, legs, and antennae.
Do arthropods have muscles?
Most arthropods move by means of their segmental appendages, and the exoskeleton and the muscles, which attach to the inside of the skeleton, act together as a lever system, as is also true in vertebrates. The external skeleton of arthropods is a highly efficient system for small animals.
What are salient features of Arthropoda?
- They possess an exoskeleton.
- They have jointed appendages.
- Their body is segmented.
- They are bilaterally symmetrical.
- They possess an open circulatory system.
What is body cavity in arthropods?
Arthropods also have a hemocoel, an open body cavity in which blood flows and bathes the tissues and organs.
Which organism has true coelom?
The animals which have true coelom are called eucoelomates or coelomates, eg, annelids, echinoderms and chordates. Among given option Pheretima (annelid) has tme coelom (shizocoel). The coelom is filled with milky white alkaline coelomic fluid.
Which of the following does not have a true coelom?
So, the correct answer is ‘Platyhelminthes‘.
When the animals are called coelomates?
Coelom Definition
The mesodermal tissue also goes on to form the blood, bones, digestive tract, gonads, kidneys, and other organs. Organisms that possess a true coelom are called (true) coelomates. True coelomates are often grouped into two categories: protostomes and deuterostomes.
Do all cnidarians have nematocysts?
Nematocysts or cnidocysts represent the common feature of all cnidarians. They are large organelles produced from the Golgi apparatus as a secretory product within a specialized cell, the nematocyte or cnidocyte.
Do Cnidaria have muscles?
Muscles in cnidarians are extensions of the bases of ectodermal and endodermal cells. Individual muscle cells are relatively long and may occur in dense tracts in jellyfish or sea anemones. Most cnidarian muscles, however, are thin sheets at the base of ectodermal and endodermal layers.
Do cnidarians have exoskeleton?
A fundamental evolutionary feature of Cnidaria is the skeleton that may be present as an endoskeleton, exoskeleton, or hydrostatic skeleton.
What do the nerve cells of cnidarians make up?
Cnidarians contain specialized cells known as cnidocytes (“stinging cells”), which contain organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, serving to immobilize prey with toxins contained within the cells. Nematocysts contain coiled threads that may bear barbs.
How do cnidarians and echinoderms function and perform behaviors without having a brain?
SIMPLE NERVE NETS IN CNIDARIANS AND ECHINODERMS. Cnidarians (jellyfish and anemones, also sometimes called coelenterates) have neurons but no centralized brain. They still manage to organize fairly complex behaviors. In cnidarians a net of axons lies between the inner and outer body walls.
Do cnidarians have a brain?
Cnidaria do not have a brain or groups of nerve cells (“ganglia”). The nervous system is a decentralized network (‘nerve net’), with one or two nets present. They do not have a head, but they have a mouth, surrounded by a crown of tentacles. The tentacles are covered with stinging cells (nematocysts).
What type of reproduction do cnidarians have?
Cnidarians reproduce both sexually and asexually. Some species can produce both eggs and sperm in the same organism. These organisms are called simultaneous hermaphrodites and release gametes into the ocean in egg-sperm bundles. Some species are also either male or female and produce either eggs or sperm.
How do nematocysts work for cnidarians?
The nematocyst is a coiled thread-like stinger. When the nematocyst is called upon to fire, the thread is uncoiled, and springs straight. The harpoon-like thread punctures through the cnidocyte wall and into the prey. Most Cnidarians also have a toxin in their stinger which helps to disable the prey.
How do cnidarians use their tentacles Brainly?
Explanation: All Cnidarians have tentacles with stinging cells in their tips which are used to capture and subdue prey. In fact, the phylum name “Cnidarian” literally means “stinging creature.” The stinging cells are called cnidocytes and contain a structure called a nematocyst.