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
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?
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.
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
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).
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
Description : How does the excretory system of nematodes work?
Last Answer : The metabolic residuals of nematodes are collected by two longitudinal lateral excretory channels that open in one single excretory pore near the mouth. Phylum Nematoda Review - Image Diversity: nematode excretory system
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).
Description : What is the main evolutionary innovation presented by nematodes? What is the advantage of that innovation?
Last Answer : The main evolutionary innovation of nematodes is the complete digestive system, with two openings (mouth and anus). Since the ingestion and the defecation processes can occur in different ... body and not yet eliminated. Phylum Nematoda Review - Image Diversity: nematode digestive system
Description : Are nematodes diploblastic or triploblastic animals?
Last Answer : Just like platyhelminthes, nematodes are triploblastics, i.e., they present three germ layers (ectoderm, mesoderm and endoderm). Phylum Nematoda Review - Image Diversity: germ layers
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.
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.
Description : Are nematodes exclusively parasites?
Last Answer : There are parasitic roundworms, including parasites of plants, but there are also free-living 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).
Description : Praziquantel is effective against B A. Trematodes B. Cestodes C. Nematodes D. None
Last Answer : Cestodes
Description : Cry I endotoxins obtained from Bacillus thuringiensis are effective against (a) nematodes (b) bollworms (c) mosquitoes (d) flies.
Last Answer : b) bollworms
Description : Silencing of mRNA has been used in producing transgenic plants resistant to (a) boll worms (b) nematodes (c) white rusts (d) bacterial blights.
Last Answer : (b) nematodes
Description : The process of RNA interference (RNAi) has been used in the development of plants resistant to (a) nematodes (b) fungi (c) viruses (d) insects.
Last Answer : (a) nematodes
Description : Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to (a) insect pests (b) fungal diseases (c) plant nematodes (d) insect predators.
Last Answer : (a) insect pests
Description : Diphtheria is caused by (a) nematodes (b) bacteria (c) virus (d) none of these.
Last Answer : (b) bacteria
Description : Ringworm in humans is caused by (a) bacteria (b) fungi (c) nematodes (d) viruses.
Last Answer : (b) fungi
Description : Damping-off is caused by: a. Fungi b. Bacteria c. Nematodes d. Virus
Last Answer : Fungi
Description : Nematodes are — a. Monoblastic b. Diploblastic c. Triploblastic d. None of these
Last Answer : c. Triploblastic
Description : Mention the class of Echinococcus a) Cestoda b) Trematoda c) Turbularia d) Nematodes
Last Answer : a) Cestoda
Description : Which anthelmintic drug acts through a specific glutamate gated Cl– ion channel found only in nematodes: A. Ivermectin B. Niclosamide C. Pyrantel pamoate D. Praziquantel
Last Answer : A. Ivermectin
Description : he following anthelmintic acts as a cholinergic agonist in the nematodes and causes spastic paralysis of the worms: A. Piperazine B. Pyrantel pamoate C. Mebendazole D. Thiabendazole
Last Answer : B. Pyrantel pamoate