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?

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?
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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 ring connected to two neural chords, a ventral and a dorsal one, while in planarias (platyhelminthes) there are only two small anterior “cerebral” ganglia from which neural chords split. Cephalization in annelids thus is more outstanding than in nematodes or in flatworms. Image Diversity: earthworm nervous system
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Which are the morphological features that differentiate the beings of the phylum Annelida from nematodes and platyhelminthes?

Description : Which are the morphological features that differentiate the beings of the phylum Annelida from nematodes and platyhelminthes?

Last Answer : Platyhelminthes are worms with flat bodies (flatworms), nematodes are worms with cylindrical but not segmented bodies (roundworms). Annelids are cylindrical worms with segmented bodies (they are metameric).

How is the respiratory system of beings of the phylum Annelida characterized?

Description : How is the respiratory system of beings of the phylum Annelida characterized?

Last Answer : Respiration in annelids can be cutaneous or branchial. Cutaneous respiration occurs due to the rich vascularity under the epidermis. The gills, present in aquatic annelids, are located in the parapodia (false claws) that have an extensive capillary net. Image Diversity: annelid respiratory system

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

Are mollusc metameric beings? Exclusively analyzing this feature could it be said that molluscs are evolutionarily proximal to nematodes or to annelids?

Description : Are mollusc metameric beings? Exclusively analyzing this feature could it be said that molluscs are evolutionarily proximal to nematodes or to annelids?

Last Answer : In molluscs there is not a body divided into segments. Considering just this feature it could be said that evolutionarily they are more proximal to nematodes than to annelids.

An animal kept in a jar has the following features. (I) It is bilaterally symmetrical. (II) It has coelomic cavity (Ill) The body is segmented (IV) It has jointed appendages. To which phylum does the animal belong to? (1) Arthropoda (2) Annelida (3) Platyhelminthes (4) Mollusca

Description : An animal kept in a jar has the following features. (I) It is bilaterally symmetrical. (II) It has coelomic cavity (Ill) The body is segmented (IV) It has jointed appendages. To which phylum does the animal belong to? (1) Arthropoda (2) Annelida (3) Platyhelminthes (4) Mollusca

Last Answer : I) It is bilaterally symmetrical.

Is the nervous system in platyhelminthes more or less sophisticated than in cnidarians? What are the main neural structures found in flatworms? How is this neural organization important for the diversity of biological niches explored by species of the phylum?

Description : Is the nervous system in platyhelminthes more or less sophisticated than in cnidarians? What are the main neural structures found in flatworms? How is this neural organization important for the diversity of biological niches explored by species of the phylum?

Last Answer : Platyhelminthes present a more sophisticated nervous system than cnidarians, as the first neural chords with ganglia (grouping of neurons) appear, a characteristic of the evolutionary process of ... that are parasites and those that are free-living. Image Diversity: platyhelminth nervous system

How does digestion in beings of the phylum Annelida work and which type of digestive system do they have?

Description : How does digestion in beings of the phylum Annelida work and which type of digestive system do they have?

Last Answer : Digestion in beings of the phylum Annelida is extracellular. These animals have a complete digestive system, with mouth and anus. Image Diversity: earthworm digestive system

Concerning the occurrence of separated sexes how are the beings of the phylum Annelida classified?

Description : Concerning the occurrence of separated sexes how are the beings of the phylum Annelida classified?

Last Answer : These beings may be dioecious (the majority of polychaetes) or hermaphrodite monoecious (oligochaetes and hirudineans).

How can the presence, localization and function of muscular tissue in beings of the phylum Annelida be explained?

Description : How can the presence, localization and function of muscular tissue in beings of the phylum Annelida be explained?

Last Answer : In these beings there are a longitudinal muscular layer under the epidermis and, internally juxtaposed and perpendicular to it, another circular (radial to the axis) muscular layer. The ... of elongating the body while the longitudinal shortens it. By alternating actions both promote movement.

What is meant when it is said that beings of the phylum Annelida are vascular beings? From which other phyla of the animal kingdom does this feature differentiate them?

Description : What is meant when it is said that beings of the phylum Annelida are vascular beings? From which other phyla of the animal kingdom does this feature differentiate them?

Last Answer : The classification of these beings as vascular beings means that they have a circulatory system, with vessels that distribute substances throughout the body. Poriferans, cnidarians and flatworms do ... system. In nematodes there is circulation of gases and nutrients through the pseudocoelom fluid.

What is the morphological characteristic that evolutionarily approximates the beings of the phylum Annelida to arthropods?

Description : What is the morphological characteristic that evolutionarily approximates the beings of the phylum Annelida to arthropods?

Last Answer : The metameric feature, i.e., the body segmentation in metameres, approximates annelids to arthropods since these animals are segmented beings too. (Bristles present in oligochaete and polychaete annelids are also covered with chitin, the same substance of the arthropod exoskeleton.)

Into which classes are platyhelminthes divided? How are these classes characterized and what are some representative beings of each of them?

Description : Into which classes are platyhelminthes divided? How are these classes characterized and what are some representative beings of each of them?

Last Answer : Platyhelminthes are divided into three classes: turbellarians (or Turbellaria), trematodes (or Trematoda) and cestodes (or Cestoda). Turbellarians are free-living platyhelminthes and their ... saginata and Taenia solium) that parasite humans. Image Diversity: turbellarians trematodes cestodes

What are the morphological similarities and differences between nematodes and annelids?

Description : What are the morphological similarities and differences between nematodes and annelids?

Last Answer : Nematodes, like annelids, have a cylindrical elongated body. Annelids differentiate from nematodes by presenting a segmented body (body divided into metameres) and so they are called segmented worms.

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?

In constrast to annelids the Platyhelminthes show

Description : In constrast to annelids the Platyhelminthes show

Last Answer : In constrast to annelids the Platyhelminthes show A. Absence of body cavity B. Presence of pseudocoel C. Radial symmetry D. Bilaterla Symmetry

Solenocytes are the main excretory structures in (a) echinodermates (b) platyhelminthes (c) annelids (d) molluscs.

Description : Solenocytes are the main excretory structures in (a) echinodermates (b) platyhelminthes (c) annelids (d) molluscs.

Last Answer : (b) platyhelminthes

In contrast to annelids the platyhelminthes show (a) absence of body cavity (b) bilateral symmetry (c) radial symmetry (d) presence of pseudocoel.

Description : In contrast to annelids the platyhelminthes show (a) absence of body cavity (b) bilateral symmetry (c) radial symmetry (d) presence of pseudocoel.

Last Answer : (a) absence of body cavity

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

Compared to platyhelminthes which physiological problem have the cylindrical body of nematodes brought? How was that problem solved?

Description : Compared to platyhelminthes which physiological problem have the cylindrical body of nematodes brought? How was that problem solved?

Last Answer : The cylindrical shape of nematodes made impossible the respiration exclusively by simple diffusion among cells since there are tissues far from the exterior. This problem was solved by the ... respiration is cutaneous; it is considered that these animals still make respiration by diffusion).

What is the typical morphological feature of nematodes that differentiates them from platyhelminthes?

Description : What is the typical morphological feature of nematodes that differentiates them from platyhelminthes?

Last Answer : Nematodes are also known as roundworms. As the name indicates they are not flat like platyhelminthes. In evolutionary grounds with the nematodes the first complete digestive system appears, with mouth and anus, and the pseudocoelom is also a novelty.

What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?

Description : What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?

Last Answer : Platyhelminthes are also known as flatworms because they are worms with a flat body. This is the main external morphological feature that differentiates them from nematodes (roundworms).

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?

Peripatus is a connecting link between (a) mollusca and echinodermata (b) annelida and arthropoda (c) coelenterata and porifera (d) ctenophora and platyhelminthes

Description : Peripatus is a connecting link between (a) mollusca and echinodermata (b) annelida and arthropoda (c) coelenterata and porifera (d) ctenophora and platyhelminthes

Last Answer : (b) annelida and arthropoda

Bilaterally symmetrical and acoelomate animals are exemplified by (a) ctenophora (b) platyhelminthes (c) aschelminthes (d) annelida

Description : Bilaterally symmetrical and acoelomate animals are exemplified by (a) ctenophora (b) platyhelminthes (c) aschelminthes (d) annelida

Last Answer : (b) platyhelminthes

Metameric segmentation is the characteristic of (a) mollusca and chordata (b) platyhelminthes and arthropoda(c) echinodermata and annelida (d) annelida and arthropoda.

Description : Metameric segmentation is the characteristic of (a) mollusca and chordata (b) platyhelminthes and arthropoda (c) echinodermata and annelida (d) annelida and arthropoda.

Last Answer : (d) annelida and arthropoda.

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

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

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

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 one of the following is not a characteristic of Phylum Annelida? (a) Pseudocoelom (b) Ventral nerve cord (c) Closed circulatory system (d) Segmentation

Description : Which one of the following is not a characteristic of Phylum Annelida? (a) Pseudocoelom (b) Ventral nerve cord (c) Closed circulatory system (d) Segmentation

Last Answer : (a) Pseudocoelom

How is the nervous system of nematodes organized? Where are the neural chords located in their body?

Description : How is the nervous system of nematodes organized? Where are the neural chords located in their body?

Last Answer : Roundworms have a ganglial nervous system with an anterior neural ring representing (evolutionarily) a primitive cephalization. Nematodes have two main longitudinal ganglial chords that extend one dorsally ... , Horvitz and Sulston). Phylum Nematoda Review - Image Diversity: nematode nervous system

Comment on the reproduction of the members of the phylum Platyhelminthes.

Description : Comment on the reproduction of the members of the phylum Platyhelminthes.

Last Answer : Comment on the reproduction of the members of the phylum Platyhelminthes.

Mention the unique features of phylum Platyhelminthes.

Description : Mention the unique features of phylum Platyhelminthes.

Last Answer : Mention the unique features of phylum Platyhelminthes.

Crabs belongs to the phylum – (1) Mollusca (2) Cnidaria (3) Arthropoda (4) Platyhelminthes

Description : Crabs belongs to the phylum – (1) Mollusca (2) Cnidaria (3) Arthropoda (4) Platyhelminthes

Last Answer : (3) Arthropoda Explanation: Crabs come from the same family as lobsters, crayfish, shrimp, krill and barnacles, as all are in the subphylum crustacea. They are also in the phylum Arthropoda.

'Crabs' belongs to the phylum of – (1) Mollusca (2) Cnidaria (3) Arthropoda (4) Platyhelminthes

Description : 'Crabs' belongs to the phylum of – (1) Mollusca (2) Cnidaria (3) Arthropoda (4) Platyhelminthes

Last Answer : (3) Arthropoda Explanation: Crabs come from the same family as lobsters, crayfish, shrimp, krill and barnacles, as all are in the subphylum crustacea. They are also in the phylum Arthropoda.

Write down the characteristics of phylum Platyhelminthes.

Description : Write down the characteristics of phylum Platyhelminthes. 

Last Answer : i) They are also called flat worms because their body is flattened. ii) These are triploblastic animals. So their body is divided into three layers. Ectoderm, Mesoderm and Endoderm. iii) ... of other animals. iv) Their common examples are Liver Fluke, Tapeworm and Planaria etc. 

Helminthology is the study of Phylum C A. Platyhelminthes B. Nemathelminths C. Both D. None

Description : Helminthology is the study of Phylum C A. Platyhelminthes B. Nemathelminths C. Both D. None

Last Answer : Both

Members of Phylum Platyhelminthes are A A. Dorsoventrally flattened B. Laterally Compressed C. Round D. None

Description : Members of Phylum Platyhelminthes are A A. Dorsoventrally flattened B. Laterally Compressed C. Round D. None

Last Answer : Dorsoventrally flattened

Phylum Platyhelminthes includes B A. Round worms B. Flatworms C. Thorny headed worms D. All of above

Description : Phylum Platyhelminthes includes B A. Round worms B. Flatworms C. Thorny headed worms D. All of above

Last Answer : Flatworms

Which one of the following is a matching set of a phylum and its three examples? (a) Porifera - Spongilla, Euplectella, Pennatula (b) Cnidaria - Bonellia, Physalia, Aurelia (c) Platyhelminthes - Planaria, Schistosoma, Enterobius (d) Mollusca - Loligo, Teredo, Octopus

Description : Which one of the following is a matching set of a phylum and its three examples? (a) Porifera - Spongilla, Euplectella, Pennatula (b) Cnidaria - Bonellia, Physalia, Aurelia (c) Platyhelminthes - Planaria, Schistosoma, Enterobius (d) Mollusca - Loligo, Teredo, Octopus

Last Answer : (d) Mollusca - Loligo, Teredo, Octopus

Match the following genera with their respective phylum. (1) Ophiura (i) Mollusca (2) Physalia (ii) Platyhelminthes (3) Pinctada (iii)Echinodermata (4) Planaria (iv) Coelenterata(a) (1)-(iv), (2)-(i), (3)-(iii), (4)-(ii) (b) (1)-(iii), (2)-(iv), (3)-(i), (4)-(ii) (c) (1)-(i), (2)-(iii), (3)-(iv), (4)-(ii) (d) (1)-(iii), (2)-(iv), (3)-(ii), (4)-(i)

Description : Match the following genera with their respective phylum. (1) Ophiura (i) Mollusca (2) Physalia (ii) Platyhelminthes (3) Pinctada (iii)Echinodermata (4) Planaria (iv) Coelenterata (a) (1)-(iv), (2)-(i), (3)-(iii), (4)-(ii) (b) (1)-( ... , (3)-(iv), (4)-(ii) (d) (1)-(iii), (2)-(iv), (3)-(ii), (4)-(i)

Last Answer : (b) (1)-(iii), (2)-(iv), (3)-(i), (4)-(ii)

Which Scientists has established the ‘Phylum Annelida’? -Do You Know?

Description : Which Scientists has established the ‘Phylum Annelida’? -Do You Know?

Last Answer : answer:

Which one of the following is NOT a characteristic of phylum Annelida

Description : Which one of the following is NOT a characteristic of phylum Annelida

Last Answer : Which one of the following is NOT a characteristic of phylum Annelida A. Closed circulatory ... Segmentation C. Pseudocoelom D. Ventral nerve cord

Enlist the characteristic features of phylum Annelida.

Description : Enlist the characteristic features of phylum Annelida.

Last Answer : Enlist the characteristic features of phylum Annelida.

Insects belong to the phylum (a) Annelida (b) Arthropoda (c) Crustaceans (d) Coelenterate

Description : Insects belong to the phylum (a) Annelida (b) Arthropoda (c) Crustaceans (d) Coelenterate

Last Answer : Ans:(b)

Into which classes is the phylum Annelida divided?

Description : Into which classes is the phylum Annelida divided?

Last Answer : The phylum is divided into three classes: oligochaetes (for example, earthworms), hirudineans (e.g., leeches) and polychaetes (these are mostly marine aquatic with parapodia, like nereis). Image Diversity: oligochaetes polychaetes hirudineans