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They have an organ-system level of organization. Phylum Mollusca is a very diverse (85,000 species) group of mostly marine species. Mollusca (mollusks) are classified into 6 classes according to their symmetry and the characters of food, shell, mantle, gills, nervous system, muscles, and radula. Mollusc means soft. Phylum – Mollusca. Segmentation is both external and internal, which is called metamerism. Solution: The radula is present in all groups except the bivalves, and serves to shred or scrape food before it enters the digestive tract. iii) A – radula. Answer. The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species.Mollusks may be primitively segmented, but all but the monoplacophorans characteristically lack segmentation and have bodies that are to some degree spirally twisted (e.g. The phylum Annelida includes worm-like, segmented animals. The radula is present in all molluscs except bivalves, and only in molluscs. Mollusks are mostly dioecious and are divided into seven classes. Write any two members of the Phylum Aschelminthes which are found parasitic on Human beings. Exercise __ Phylum Mollusca I. Mollusks can be divided into seven classes, each with distinct morphological characteristics. Correct Answer : B. B. Mytilus. The radula is generally used for feeding. Radula is a file like rasping organ with transverse rows of chitinous teeth present in the buccal cavity of many molluscs. Le phylum Mollusca a été créé par Georges Cuvier (1769-1832) en 1795 [12]. The lines of growth start from an elevation— the umbo which is the thickest and the oldest part of the shell. C) Cnidaria–radial symmetry, polyp and medusa body forms. 9. Arthropoda: Corals are most closely related to which group? C. Pila. Correct option is . The five unique characteristics that place the dissected animals (clam, mussel, and oyster) in the phylum Mollusca are a shell, a foot, a radula, a mantle and the visceral mass. Phylum Mollusca Classification. Which phylum is characterized by animals that have a segmented body? The buccal cavity, at the anterior of the mollusc, contains a radula (lost in bivalves) — a ribbon of teeth supported by an odontophore, a muscular structure. The radula is present in all groups except the bivalves, and serves to shred or scrape food before it enters the digestive tract. A complex radula is used by the digestive system and aids in the ingestion of food. Animals Workshop 1 1. Phylum Mollusca is the second-largest animal phylum. They have at least two characters radula and mantle not found elsewhere. Radula is present in. D chordata . The Radula is a feeding organ unique to the Phylum Mollusca. It can be compared with the tongue of human beings but, unlike our tongue, it is used for cutting and chewing food before it enters the esophagus. A chitinous scraper called the radula is present in most mollusks. Bilaterally symmetrical, triploblastic, coelomate, organ system organisation; Unsegmented body covered with a calcareous shell; Distinct head, muscular foot and the visceral hump is present; Respiratory and excretory functions are executed by feather-like gills; The radula is a rasping organ for feeding Share this question with your friends. The hinge-teeth are present in Unio. Answer: Ascaris (Roundworm) Wuchereria (Filaria worm) Question 3. Respiration is facilitated by gills known as ctenidia. Reproduction: These are usually dioecious and oviparous. Phylum Annelida includes the classes Polychaeta and Clitellata (); the latter contains subclasses Oligochaeta, ... A chitinous scraper called the radula is present in most mollusks. Phylum arthropoda is the most numerous phyla of all living organisms, both in number of species and in number of individuals. These animals do not possess eyes, but they have a radula, as well as a foot modified into tentacles with a bulbous end, known as captaculae. 9. Classification of Phylum Mollusca. The radula is a long ribbon composed of successive transverse rows of amber or black, chitinous teeth, some of which are capped with an iron compound known as magnetite. A. Loligo. It is used to scrape and scratch the food and to create depressions in rocks used as habitat. They respire through gills or ctenidia or lungs or pulmonary sac or through the body surface. It bears many rows of tiny teeth that are replaced as they wear down e.g., Limplet is a marine invertebrate that uses its radula for creating home by boring a shallow hole in the rock. It is used for scrapping or cutting food before it enters into the stomach. Lot more interesting detail can be read here.Also asked, is segmentation present in Mollusca? Animals in phylum Mollusca are soft-bodied and have a shell. B mollusca . The foregut region is made of an esophagus plus a mouth cavity, which contains a toothed belt called the radula, present in Pretty much all mollusks and peculiar to your phylum. Thus, the correct answer is option A. Radular teeth are secreted far at the rear end of the radula. Loligo is a mollusc. A radula is present in the oesophagus which is a ribbon-like structure with recurved chitinous teeth stretched over a cartilaginous base helps as a scraper in feeding; absent in bivalves. 93) Which of the following combinations of phylum and description is incorrect? Approximately 16,500 species have been described. Radula. B) Nematoda–roundworms, pseudocoelomate. The radula is generally employed for scraping food, for example algae, from surfaces. A radula is present in members of which class(es)? It is ribbon like and comparable to tongue. C. echinodermata. The radula is an anatomical structure that is used by molluscs for feeding, sometimes compared rather inaccurately to a tongue. Phylum Mollusca. The phylum Annelida includes worm-like, segmented animals. They vary in size from giant squids and clams to little snails, a millimeter long. A file like rasping organ for feeding, called radula, present in the phylum _____. The radula resembles a zipper. Question 2. Early development in some species occurs via two larval stages: trochophore and veliger. Examine a radula removed from a Katherina. The mantle (also known as the pallium ) is the dorsal epidermis in mollusks; all mollusks except some cephalopods are specialized to secrete a calcareous shell that protects the animal’s soft body. Loligo is a genus of squid. C echinodermata . The teeth are so arranged that the teeth of one fit into the sockets of the other valve. PHYLUM – ECHINODERMATA. Introduction This phylum is composed of the snails, slugs, oysters, octopods, nautili and tusk shells, with sizes ranging from a 1-mm snail to the several meters like the giant squid. Question No : 11 A file like rasping organ for feeding, called radula, present in the phylum _____. D. chordata. It is an elongated structure bearing trans­verse rows of serrations. Selon MolluscaBase [2], il y a actuellement neuf classes de mollusques. D) Platyhelminthes–flatworms, gastrovascular cavity, acoelomate Segmentation is both external and internal, which is called metamerism. Solution: The radula is a special structure in molluscs which is used to scrape and scratch the food and to create a depression in rocks which molluscs use as their habitat. They may be found as hidden parasites in the interior of other animals. A arthropoda . A. Loligo. The radula is a special rasping structure present many molluscs. They are sluggish invertebrates, with a thin fleshy envelope or mantle covering the visceral organs. It is present in Loligo. Phylum Mollusca (Mollusks) Characteristics They are essentially aquatic mostly marine, few freshwater and some terrestrial form. At the floor of the buccal cavity, is present a chitinous ribbon-like structure called radula or lingual ribbon (Fig. Most have shells in numbers of 1, 2 or 6 which is secreted by the mantle. D. Unio. Each transverse row contains about seven teeth — two marginals and a lateral on either sides of a median rachidian tooth, forming the formula 2, 1, 1, 1, 2 = 7. The ventral foot is used in locomotion. B. mollusca. Mollusks have a dramatic variety of form, ranging from large predatory squids and octopus, some of which show a high degree of intelligence, to grazing forms with elaborately sculpted and colored shells. A radula is characteristic of most molluscs: this hard, chitinous strip bearing teeth is used as a file or a drill to aid foodgathering.Mollusc shells are well preserved as fossils: monoplacophorans and bivalves are known from the middle Cambrian; univalves and cephalopods from the upper Cambrian.Octopuses are found in the late Cretaceous, but squids are found only in Tertiary rocks. It has snails, octopuses, slugs, cuttlefish, oysters, and many others. Respiratory organs are of comb-like structures known as molluscan gills or ctenidia or branchiae lodged in the mantle cavity, found in aquatic forms. Phylum Mollusca is the second largest phylum. File-like rasping organ; called radula is present in the mouth for feeding. Triploblastic and having a reduce coelom. Development is indirect. Correct Answer : B. The radula is present in all groups except the bivalves, and serves to shred or scrape food before it enters the digestive tract. It belongs to Cephalopoda class of mollusca. A) Echinodermata–bilateral symmetry as a larva, coelom present. Sexual dimorphism is the predominant sexual strategy in this phylum. The mantle (also known as the pallium ) is the dorsal epidermis in mollusks; all mollusks except some cephalopods are specialized to secrete a calcareous shell that protects the animal's soft body. In some animal groups, the body is found divided into compartments with at least some organs/ organ repeated. Share this question with your friends. Phylum Annelida are segmented worms found in marine, terrestrial, and freshwater habitats, but the presence of water or humidity is a critical factor for their survival in terrestrial habitats. Mollusks are mostly dioecious and are divided into seven classes. Name the animal, which exhibits the phenomenon of bioluminescence. The radula is the toothed chitinous ribbon in the mouth of most molluscs. A and B only: Among the invertebrates, arthropods are unique in possessing : wings. (A) Malpighian tubules are the excretory organs present in terrestrial arthropods and are responsible for maintaining the ionic and osmotic balance. The term Mollusca was derived from the term given by Aristotle to cuttlefish. Question 7. It is used for feeding. The mantle (also known as the pallium ) is the dorsal epidermis in mollusks; all mollusks except some cephalopods are specialized to secrete a calcareous shell that protects the animal's soft body. torsion). They are bilateral with secondary asymmetrical symmetry. The majority are filter feeders and have no head or radula. Phylum Annelida includes the classes Polychaeta and Clitellata (); the latter contains subclasses Oligochaeta, ... A chitinous scraper called the radula is present in most mollusks. The phylum Mollusca animals have a file-like rasping organ called radula that helps in feeding. Common Examples: Pila (Apple snail), Pinctada (Pearl oyster), Sepia (Cuttlefish), Loligo (Squid), Octopus (Devil fish), Aplysia (Seahare), Dentalium (Tusk shell) and Chaetopleura (Chiton). The animals belonging to the phylum Mollusca have soft-bodies, triploblastic and bilaterally symmetrical and coelomate. 1.84B). Mollusks are mostly dioecious and are divided into seven classes. What is the role of the radula in molluscs? sea anemones: Generally, members of which flatworm class are nonparasitic? Series of concentric lines of growth are present on the external surface of the shell. A chitinous-toothed tongue called the radula is present in most mollusks. 10. This cavity is distinct from the coelomic cavity, which the adult animal retains, surrounding the heart. The name of the phylum is derived from the Latin word annellus, which means a small ring. A rasping organ with transverse teeth and present in the buccal cavity of a mollusca is called radula. These tubules remove the waste from the hemolymph and the final excretion occurs in the rectum. View Answer Discuss. The study of Mollusca is called Malacology. They have a complete digestive system and having rasping organ radula with transverse rows of teeth. This foot propels the mollusc by utilizing muscular waves and/or cilia in combination with mucus. A. arthropoda. Mention the phylum to which it belongs.

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