How are the symmetry and the nervous system characterized in echinoderms?

How are the symmetry and the nervous system characterized in echinoderms?
by

1 Answer

Answer :

Adult echinoderms, along with cnidarians, are the animals that present radial symmetry, i.e., their body structures are distributed around a center. The radial symmetry in echinoderms however is a secondary radial symmetry, since their larval stage has bilateral symmetry and the radial pattern appears only in adult individuals (there are some few adult echinoderms with lateral symmetry). All other animals have lateral symmetry with exception of poriferans (no symmetry is defined for them). Echinoderms do not present cephalization and they have a diffuse network of nerves and neurons made of a neural ring around the mouth and of radial nerves that ramify to follow the pentaradial structure of the body. Phylum Echinodermata - Image Diversity: radial symmetry
by
selected by

Related questions

Echinoderm identity card. How are echinoderms characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Echinoderm identity card. How are echinoderms characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: sea cucumber, sea urchin, starfishes. Basic morphology: calcareous endoskeleton with spines, ambulacral system. Type of symmetry: secondary radial. Germ layers and ... cephalization. Types of reproduction: sexual, with larval stage. Phylum Chordata - Study Here

Chordate identity card. How are they characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Chordate identity card. How are they characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: protochordates (ascidians, amphioxus), vertebrates. Basic morphology: branchial clefts, notochord, neural tube. Type of symmetry: bilateral. Germ layers and coelom: ... in vertebrates. Types of reproduction: sexual, with or without larval stage. Fish Review

Mollusc identity card. How are molluscs characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Mollusc identity card. How are molluscs characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: snails, sea slugs, octopuses, squids, mussels, oysters. Basic morphology: soft body, with or without calcareous shell. Type of symmetry: bilateral. ... system: ganglial, advanced cephalization in cephalopods. Types of reproduction: sexual. Phylum Echinodermata Review

Arthropod identity card. How are arthropods characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Arthropod identity card. How are arthropods characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: cockroaches, flies, crabs, lobsters, shrimps, spiders, scorpions, mites. Basic morphology: segmented body (metameric), articulated limbs, chitinous exoskeleton, ... crustaceans, metamorphosis in some insects, no larval stage in arachnids. Phylum Mollusca Review

Annelid Identity card. How are they characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Annelid Identity card. How are they characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: earthworms, leeches, lugworms. Basic morphology: cylindrical body, segmented (metameric). Type of symmetry: bilateral. Germ layers and coelom: triploblastics, ... ). Types of reproduction: sexual, with dioecious and monoecious beings. Phylum Arthopoda Review

Nematode identity card. How are nematodes characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Nematode identity card. How are nematodes characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: ascaris, hookworms, filaria, pinworms. Basic morphology: cylindric (round) body, not segmented. Type of symmetry: bilateral. Germ layers and coelom: ... ganglial chord, primitive cephalization. Types of reproduction: sexual. Phylum Annelida - Q&A Review

Platyhelminth identity card. How are platyhelminthes characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Platyhelminth identity card. How are platyhelminthes characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: planarias, schistosomes, taenias. Basic morphology: flat worm. Type of symmetry: bilateral. Germ layers and coelom: triploblastics, acoelomates. Digestive system: ... , beginning of cephalization. Types of reproduction: asexual and sexual. Phylum Nematoda Review

Cnidarian identity card. How are they characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Cnidarian identity card. How are they characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: jellyfish, corals, sea anemones, hydra. Basic morphology: polyp or medusa. Type of symmetry: radial. Germ layers and coelom: diploblastics, acoelomate. Digestive ... of reproduction: asexual and sexual with larval stage and metagenesis. Flatworms - Study Them Here

Sponge identity card. How are sponges characterized according to example of representing beings, basic morphology, type of symmetry, embryonic (germ) layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Sponge identity card. How are sponges characterized according to example of representing beings, basic morphology, type of symmetry, embryonic (germ) layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Example of representing beings: sponges. Basic morphology: tubular or globular body with spongocoel, sessile; choanocytes, pinacocytes and amoebocytes. Type of symmetry: not established. Germ layers ... Types of reproduction: asexual and sexual with larval stage. Cnidarians - Questions and Answers

Which of the following animals are true coelomates with bilateral symmetry? (a) Adult Echinoderms (b) Aschelminthes (c) Platyhelminthes (d) Annelids

Description : Which of the following animals are true coelomates with bilateral symmetry? (a) Adult Echinoderms (b) Aschelminthes (c) Platyhelminthes (d) Annelids

Last Answer : (d) Annelids

How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?

Description : How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?

Last Answer : The echinoderm skeleton is internal, i.e., it is an endoskeleton. It is made of calcium carbonate (calcareous). Vertebrates also have internal skeleton made of bones and cartilages. Arthropods ... of chitin, a chitinous exoskeleton. Some molluscs present a calcareous shell that works as exoskeleton.

The tubular and dorsal nervous system of chordates is related to the cephalization in these animals and to bilateral symmetry. The presence of neural integrating centers with concentration of neurons in the brains and the spinal cord (central nervous system, CNS) allowed the increase of the interaction complexity between these animals and the environment. Receptor (afferent conduction) and efferent (motor, regulatory and behavioral reactions) functions come out more sophisticated in chordates due to the presence of more well-developed neural networks. These features have been preserved by evolution as they provide adaptive advantage to their owners.

Description : The tubular and dorsal nervous system of chordates is related to the cephalization in these animals and to bilateral symmetry. The presence of neural integrating centers with concentration of ... These features have been preserved by evolution as they provide adaptive advantage to their owners.

Last Answer : How can the tubular-dorsal nervous system in chordates be compared to the nervous pattern present in invertebrates?

Is the tubular-dorsal nervous system of chordates associated to radial or lateral symmetry?

Description : Is the tubular-dorsal nervous system of chordates associated to radial or lateral symmetry?

Last Answer : How does that explain the complexity level of the nervous system reached by the vertebrate evolutionary branch?

Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature? Animals Morphological features (a) Scorpion, spider, – Ventral solid central cockroach nervous system (b) Cockroach, locust, – Metameric Taenia segmentation(c) Liver fluke, – Bilateral symmetry sea anemone, sea cucumber (d) Centipede, prawn, – Jointed appendages sea urchin

Description : Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature? Animals Morphological features (a) Scorpion, spider, - Ventral solid ... symmetry sea anemone, sea cucumber (d) Centipede, prawn, - Jointed appendages sea urchin

Last Answer : (a) Scorpion, spider, – Ventral solid central cockroach nervous system

A meso compound : (a) is an achiral molecule which contains chiral carbons (b) contains a plane of symmetry or a centre of symmetry (c) is optically inactive (d) is characterized by all of the above

Description : A meso compound : (a) is an achiral molecule which contains chiral carbons (b) contains a plane of symmetry or a centre of symmetry (c) is optically inactive (d) is characterized by all of the above

Last Answer : ) is characterized by all of the above

How is the nervous system characterized in beings of the phylum Annelida? How can one compare cephalization in annelids to cephalization in nematodes and platyhelminthes?

Description : How is the nervous system characterized in beings of the phylum Annelida? How can one compare cephalization in annelids to cephalization in nematodes and platyhelminthes?

Last Answer : Annelids have a nervous system made of two ventral chords and one relatively big nervous cell concentration in its anterior portion resembling a primitive brain. Nematodes have an anterior neural ... is more outstanding than in nematodes or in flatworms. Image Diversity: earthworm nervous system

Which of the following diseases is a rare, transmissible, progressive fatal disease of the central nervous system characterized by spongiform degeneration of the gray matter of the brain? a) Creutzfeldt-Jakob’s disease The disease causes severe dementia and myoclonus.

Description : Which of the following diseases is a rare, transmissible, progressive fatal disease of the central nervous system characterized by spongiform degeneration of the gray matter of the brain? a) ... disease of the nervous system that results in progressive involuntary dance-like movement and dementia.

Last Answer : a) Creutzfeldt-Jakob’s disease The disease causes severe dementia and myoclonus.

Which of the following diseases is a chronic, degenerative, progressive disease of the central nervous system characterized by the occurrence of small patches of demyelination in the brain and spinal cord? a) Multiple sclerosis The cause of MS is not known and the disease affects twice as many women as men.

Description : Which of the following diseases is a chronic, degenerative, progressive disease of the central nervous system characterized by the occurrence of small patches of demyelination in the brain and ... the central nervous system characterized by spongiform degeneration of the gray matter of the brain.

Last Answer : a) Multiple sclerosis The cause of MS is not known and the disease affects twice as many women as men.

AE in young chicks is characterized by A A. nervous disorder B. watery diarrhea C. lesions on the liver D. None of these

Description : AE in young chicks is characterized by A A. nervous disorder B. watery diarrhea C. lesions on the liver D. None of these

Last Answer : nervous disorder

Not all animals have a circulatory system. Poriferans, cnidarians, platyhelminthes and nematodes (in these there are the pseudocoelom fluid but no vessels) are avascular animals. Echinoderms do not have true circulatory systems either.

Description : Not all animals have a circulatory system. Poriferans, cnidarians, platyhelminthes and nematodes (in these there are the pseudocoelom fluid but no vessels) are avascular animals. Echinoderms do not have true circulatory systems either.

Last Answer : What is the alternative means for transport of substances in animals without a circulatory system? Why is blood important for larger animals?

Do echinoderms have an excretory system? How is excretion done in these animals?

Description : Do echinoderms have an excretory system? How is excretion done in these animals?

Last Answer : Echinoderms do not have an excretory system. Their excretions are eliminated by diffusion.

What is the type of digestive system of echinoderms?

Description : What is the type of digestive system of echinoderms?

Last Answer : Echinoderms present a complete digestive system, with mouth and anus.

What is the system that permits movement and fixation to echinoderms?

Description : What is the system that permits movement and fixation to echinoderms?

Last Answer : The system that permits movement and fixation to substrates in echinoderms is called the ambulacral system. In these animals water enters through a structure called madreporite, passes through ... emptied by water thus acting as suckers. Phylum Echinodermata - Image Diversity: ambulacral system

The canal system is a characteristic feature of (a) echinoderms (b) sponges (c) helminthes (d) coelenterates.

Description : The canal system is a characteristic feature of (a) echinoderms (b) sponges (c) helminthes (d) coelenterates.

Last Answer : (b) sponges

Which of the following traits is not characteristics of echinoderms ?

Description : Which of the following traits is not characteristics of echinoderms ?

Last Answer : Which of the following traits is not characteristics of echinoderms ? A. Water vascular system B. Trochophore larva C. Tube feet D. Enterocoel

Echinoderms are closely related to chordates due to the following characters .

Description : Echinoderms are closely related to chordates due to the following characters .

Last Answer : Echinoderms are closely related to chordates due to the following characters . A. Tube- within - ... have mesodermal endoskeleton . D. All of these

Which of the following statement is incorrect for echinoderms ?

Description : Which of the following statement is incorrect for echinoderms ?

Last Answer : Which of the following statement is incorrect for echinoderms ? A. The most distinctive feature ... D. They have well- developed circulatory system.

Echinoderms and chordates have

Description : Echinoderms and chordates have

Last Answer : Echinoderms and chordates have A. Pseudocoel B. Shizocoelom C. Enterocoelom D. Hemocoel

Are echinoderms endothermic?

Description : Are echinoderms endothermic?

Last Answer : Yes

Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly found protochordate species, what is an example of a discovery that would weaken the hypothesis? What is an example of a discovery that would strengthen it?

Description : Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly ... the hypothesis? What is an example of a discovery that would strengthen it?

Last Answer : Hypothesis to be tested: Vertebrates evolved from echinoderms. Testing material: A newly found protochordate species (i.e., a vertebrate forerunner). Example of weakening observation (that ... shows how science works, beginning with the placement of hypothesis and further observational testing.)

Is there a larval stage in echinoderms?

Description : Is there a larval stage in echinoderms?

Last Answer : In echinoderms embryonic development is indirect, with ciliated larvae.

Do echinoderms present internal or external fecundation? Is there sex division among individuals?

Description : Do echinoderms present internal or external fecundation? Is there sex division among individuals?

Last Answer : The fecundation in echinoderms is external, gametes are liberated in water where fecundation occurs. The majority of echinoderms are dioecious with male and female individuals.

Do echinoderms have respiratory and circulatory systems?

Description : Do echinoderms have respiratory and circulatory systems?

Last Answer : In echinoderms there are not well-defined respiratory (with the exception of the holothurian group) and circulatory systems. The ambulacral hydrovascular system plays the function of these systems.

What is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordates?

Description : What is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordates?

Last Answer : Echinoderms and chordates are deuterostomes, i.e., in their embryonic development the blastopore turns into the anus. All other animals with complete digestive system are protostomes, i. ... digestive tube that appears in the embryonic development. Phylum Echinodermata - Image Diversity: blastopore

What are the basic morphological features of echinoderms?

Description : What are the basic morphological features of echinoderms?

Last Answer : Echinoderms, as the name indicates (echino = spiny, derma = skin), are creatures with spines originated from an endoskeleton. Their endoskeleton is made of calcareous plaques that besides spines ... have pentaradial symmetry; the radial symmetry in these animals is secondary, present only in adults.

Under which environments do echinoderms live?

Description : Under which environments do echinoderms live?

Last Answer : Echinoderms are marine animals, they live in salt water.

Select the taxon mentioned that represents both marine and fresh water species. (a) Echinoderms (b) Ctenophora (c) Cephalochordata (d) Cnidaria

Description : Select the taxon mentioned that represents both marine and fresh water species. (a) Echinoderms (b) Ctenophora (c) Cephalochordata (d) Cnidaria

Last Answer : (d) Cnidaria

Consider following features. (A) Organ system level of organisation (B) Bilateral symmetry (C) True coelomates with segmentation of body Select the correct option of animal groups which possess all the above characteristics. (a) Annelida, Mollusca and Chordata (b) Annelida, Arthropoda and Chordata (c) Annelida, Arthropoda and Mollusca (d) Arthropoda, Mollusca and Chordata

Description : Consider following features. (A) Organ system level of organisation (B) Bilateral symmetry (C) True coelomates with segmentation of body Select the correct option of animal groups which possess ... Arthropoda and Chordata (c) Annelida, Arthropoda and Mollusca (d) Arthropoda, Mollusca and Chordata

Last Answer : (B) Bilateral symmetry

Can you find the axis of symmetry of the graph of y = arctan(x) + arctan(6 - x)

Description : Can you find the axis of symmetry of the graph of y = arctan(x) + arctan(6 - x)

Last Answer : answer:We can start by finding the vertex. So when does dy/dx=0? dy/dx = 1/(1+x^2) - 1/(1+(6-x)^2) = 0. Note that when x=3, this equation is true. So, the line of ... This graph is parabolic, and therefore has only one vertex. 2) This graph is symmetric. This could also be proved using derivatives.

Creative ways to teach young children about symmetry?

Description : Creative ways to teach young children about symmetry?

Last Answer : Mirrors come to mind, as do scales. You could always do the snowflake cut-out technique where you fold a piece of paper several times, cut out shapes and then unfold. This could show radial ... more advanced than what you're going for, but it helps illustrate the underlying concept of symmetry).

Is there a general rule of symmetry in mathematics and science (see details)?

Description : Is there a general rule of symmetry in mathematics and science (see details)?

Last Answer : I think what you’re getting at is solving simultaneous linear algebraic expressions.

Can the perspective of symmetry make high school geometry more interesting?

Description : Can the perspective of symmetry make high school geometry more interesting?

Last Answer : Oh boy. That, like most math, made my brain hurt. I am so not a math person. What made me love geometry was proofs. I loved the neat way everything fit.

Biologically, why does a large percentage of nature have symmetry?

Description : Biologically, why does a large percentage of nature have symmetry?

Last Answer : There might be a cosmological reason. Symmetry “broke” this way during the Big Bang.

Are you a numbers person? Do you like order of numbers or symmetry in them?

Description : Are you a numbers person? Do you like order of numbers or symmetry in them?

Last Answer : I always take some sort of perverse pleasure rounding gas or restaurant tabs to whole bills and seeing a line of single or repeating numbers on odometers. I liked more than seems necessary ... account which was nothing but a simple string of predictably incremental numbers pleased me to no end.

How would you define symmetry?

Description : How would you define symmetry?

Last Answer : That is why symmetry has multiple defintions/considerations, because there are so many different cases. Is it the reflexive property? Or is it rotational? I’m not sure there is a concise definition. I’d be curious to know how many definitions of symmetry there are in the dictionary.

Different types of symmetry seen in flower. -Biology

Description : Different types of symmetry seen in flower. -Biology

Last Answer : answer:

How the symmetry of a flower is determined? -Biology

Description : How the symmetry of a flower is determined? -Biology

Last Answer : answer:

What is bilateral symmetry in biology? -Biology

Description : What is bilateral symmetry in biology? -Biology

Last Answer : answer:

What is bilateral symmetry in biology? -Biology

Description : What is bilateral symmetry in biology? -Biology

Last Answer : answer:

What is the axis of symmetry of f=x^2-16?

Description : What is the axis of symmetry of f=x^2-16?

Last Answer : 18