1.78B). (1999) has split Aplacophora into two classes Chaetodermorpha and Neomeniomorpha. 1. What does ctenidium mean? a. segmented body and shell. sponges and hydras, in which water current bathes the cells, a definite respiratory structure is absent. Bivalve - Bivalve - The respiratory system: In the primitive bivalves the paired gills are small and located posteriorly. Question 5. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snail and marine snails. 4. 1. RESPIRATORY ORGANS IN ANIMALS The most common respiratory organs found in animals are the general body surface, gills, tracheal tubes and lungs. Head distinct but poorly developed and without sensory tentacles and eyes. 5. The Questions and Answers of Which of the following are respiratory organs of scorpion ?a)Lungsb)Book-lungsc)Gillsd)CtenidiaCorrect answer is option 'B'. The respiratory organs are in the form of one or more ctenidia gills housed in the mantle cavity and pulmonary sacs. The mantle cavity contains a single pair of bipectinate ctenidia. C . That is why it is also called the snail's respiratory cavity. jalaldeen361976 jalaldeen361976 12.10.2020 Science Secondary School answered Ctenidia are respiratory organs 1 See answer jalaldeen361976 is waiting for your help. 3. Solution: The respiratory organ of scorpion is book lung. 1.81), Murex (Fig. 3. The classification followed here is after Ruppert and Barnes, 1994. A. Gills or ctenidia B. Mantle cavity C. Pulmonary sac D. All of the above Answer : D. Molluscs are the animals with the soft body and covered with the hard calcareous shell as the exoskeleton. Your IP: 138.68.27.135 Books lungs are formed by invaginations of cuticle at the bases of rudimentary appendages. Nervous system forming a figure of ‘8’ due to torsion. In some cases, it may be internal and covered by tissue or secondarily reduced or lost. 7. Mytilus (Fig. This group has a well formed head bearing large eyes. Aquatic Animals: Small aquatic animals, protozoa and somewhat large forms, viz. 1.79 A). 1.78G), Solecurtus (Fig. Nervous system comprises of a circumoesophageal ring and two pairs of ganglionated longitudinal cords with various modifications. 3. During mating, two worms line up inverted from each other so sperm can be exchanged. What are respiratory organs of Molluscs? 1.77C), Umax (Fig. 2. 1. for one gram mole of glucose is R.Q.= 6CO 2 /6O 2. Patella (Fig. Updated On: 18-9-2020. Classification 4. The two currents 4. 6. 15. Introduction . Respiratory System of Unio: Unio is exclusively an aquatic animal. Aquatic Animals 2. The elongated body completely enclosed by the mantle. 5. Four ctenidia, four auricles and four kidneys are present. Visceral mass is twisted at 180° in an anticlockwise direction (torsion), relative to the head and foot. Respiration in Mollusca is provided by gills or lungs, or both. 5. Lamellidens is an aquatic animal, hence, it respires by the oxygen dissolved in water, i.e., the mode of respiration is aquatic exclusively. Aquatic Respiration 2. Mouth provided with two pairs of labial plaps. The types are: 1. Chiton (Fig. Dorsal surface covered by eight shell plates. ADVERTISEMENTS: In this article we will discuss about the mechanism of gas exchange in various animals:- 1. An open blood system with a heart enclosed by the pericardium is present, through which the intestine also passes. Development indirect via trochophore and veliger larval stages or secondarily direct. Respiratory System of Cuttle Fish: The respiratory organs consist of a pair of gills or ctenidia, one on each side, situated in the mantle cavity. An open blood system with a heart enclosed by the pericardium is present, through which the intestine also passes. 12.A mollusca differs from other by. ADVERTISEMENTS: The following points highlight the top two types of respiration in mollusca. Valves equal with a few hinge teeth. 10. 8. Foot modified into a series of prehensile arms or tentacles and siphon. There are numerous gills or ctenidia in the respiratory organs usually provided with osphradium at the base. d. mantle and shell. In terrestrial forms the lung develops. • Each gill consists of a series of paired delicate lamellae along an axis. Question 4. What type of respiratory organ? ACCESSORY RESPIRATORY ORGANS. Mollusks are protostomes. Foot absent or reduced to a ventral ridge. Possess many slender, suckerless tentacles. Body bilaterally symmetrical and covered by a shield-like shell. Find answer in image to clear your doubt instantly: Related Video. 5. Its size ranges from minute planktonic and interstitial species to 20 m long giant squid, and includes both animals without eyes or brain and those with highly developed eyes and brain (among invertebrates). On the sides of the foot are present five to six pairs of monopectinate ctenidia. 4. 4. Trachea are the respiratory organ of Annelida. 9. Strictly speaking, a ctenidium is a respiratory structure that includes ciliated filaments. So, for performing this life activity, Lamellidens possesses a pair of ctenidia or gills; mantle also helps in this activity. 1.78D), Ostrea (Fig. Mantle cavity on the right side is converted into an air-breathing lung with a contractile opening, the pneumostome. Respiratory Organs of Pila Globosa: The respiratory organs consist of a single ctenidium or gill, a pulmonary sac or lung and a pair of nuchal lobes. 5. Shell usually present but operculum lacking. From the large ventral opening of the shell projects the conical or cylindrical burrowing foot and buccal region. 3. Presence of inner nacreous layer in the shell. Respiration is facilitated by gills known as ctenidia. A pair of jaw are present in the buccal cavity. c. segmented body and mantle. 5. Correct statement: Trachea are the respiratory organ of Arthopoda. Ctenidium or Gill: The ctenidium or gill is the organ of aquatic respiration. 2. Presence of one gill, one auricle and one nephridium. 1. Excretory matter is ammonia or uric acid. A comblike structure, such as the respiratory apparatus of a mollusk or a row of spines in some insects. 3. 11. 9. Sepia (Fig. 2. In terrestrial molluscs this respiration organ is reduced, but still respiration takes place in the pallial cavity. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. 2. Respiratory organs of scorpions are . Sexes are usually separate, a few forms are hermaphrodite. 4. Presence of two ctenidia, two auricles and two kidneys. Shell absent or reduced and covered by the mantle in most species. A toothed, chitinous, tongue-like ribbon, the radula is present which assists in feeding. 2. Eyes and tentacles are absent. Arthropods. Answer. 5. 8. 1.76A), Elysia, Clio, Bulla (Fig. 5. Possess a single gonad that discharges via the right kidney. They are plume- shaped structures having numerous paired, delicately folded lamellae (see Fig. 7. central axis of the shell of a gastropod. 1.75B), Pila (Fig. They occupy virtually every habitat available to animals, except the air. There are more species of arthropods than of any other group of living organisms. 1. Except in cephalopods, the circulatory system is open type. Body monomeric and highly variable, essentially with an anterior head bearing eyes and sensory tentacles, a large flat ventral foot and a posterior mantle cavity. Cloudflare Ray ID: 6492ed15a9783b15 It acts as a respiratory organ in certain forms where there is no special respiratory device. Head distinct with one or two pairs of tentacles and eyes. Adult fishes chiefly depend on pharyngeal gills for aquatic respiration. Aplysia (Fig. Answer: The respiratory organs of amphibians are gills, lungs, skin and pharyngeal region. osphradium. RESPIRATORY QUOTIENT. Excretory system includes 1 or 2 pairs of sac like kidneys, which open into the mantle cavity. Answer: True, 3. 1. 13. To keep watching this video solution for FREE, Download our App. Question 12. Presence of one or two gills within the mantle cavity anterior to the heart. Valves may be round to elongated or triangular. Worm like mollusc, body covered by cuticle. 1.76B), Doris (Fig. 2. 4. Name the respiratory organ of Mollusca. a. Mesonephridia b. Metanephridia c. Protonephridia d. Flame cells Answer: d. Flame cells. Shell is in one piece and asymmetrically spiralled. 16.39). It consists of 4 pairs of cuticular pulmonary sacs. 7. 1.79E), Loligo (Fig. Classification of Phylum Mollusca 2. Foot blade-like in burrowing species and reduced in attached forms. Phylum Mollusca - The Mantle & Associated Structures -Mantle: Houses respiratory organs; Surface functions in gas exchange -Ctenidia function as countercurrent exchanger of oxygen and carbon dioxide between circulatory system and water/air -Many taxa can withdraw head into mantle cavity You may need to download version 2.0 now from the Chrome Web Store. 2. 1. Answer: Basically all molluscs breathe by gills that are called ctenidia (comb-gills) because of their comb-like shape. Name the organism which has both features of chordate and non-chordates? Head is poorly developed. Welcome to NotesOnZoology.com! Answer: False. 3. Phylum Mollusca is one of the most conspicuous invertebrate animals. 1.78E), Lima, Pecten (Fig. Can you explain this answer? So they are called diploblastic animals. ... Ctenidia. Question 11. Terrestrial Respiration. Mantle coyers the body except the ventral ridge. 1.100). The gills in all other bivalves (save septibranchs, which have lost their gills) are greatly enlarged and possess a huge surface area. On the ventral side, is a weakly muscular, circular foot surrounded laterally and posteriorly by an extensive mantle cavity. Ruppert and Barnes (1994), Meglitsch and Schram (1991) divided Molusca into 7 classes, while Parker and Haswell (1972), Morton and Yonge (1964) have clubbed class Aplacophora and Poly- placophora into a single class Amphineura. Before publishing your Notes on this site, please read the following pages: 1. In most of the members of Aeolididae the dorsal surface of the body is provided with papillae. 3. Phylum Mollusca has been classified differently by different authors depending upon the characters of foot, mantle, shell, muscles, radula, nervous system and respiratory organs. Performance & security by Cloudflare, Please complete the security check to access. Animal Kingdom Lesson For 9th Standard Question 5. Various degrees of detorsion displayed with viscera and nervous system secondarily unwounded. The ratio between the volume of carbondioxide evolved and oxygen consumed in the oxidation of one gram mole of respiratory substrate is termed R.Q. Possess a pair of palpal tentacles (Fig. The visceral mass remains enclosed by a thick muscular fold of the body wall .called mantle. 2. Image Solution. The respiratory organ consists of two gills or ctenidia situated one on each side of the body (Figs. Ctenidia are respiratory organs Get the answers you need, now! Body soft, unsegmented, without a body ‘ cavity other than that provided by blood sinuses. Although earthworms are hermaphrodites, most need a mate to reproduce. Answer: False. Blood has a copper containing, blue respiratory pigment Haemocyanin. 1.73), Loricata, Lepidopleurus, Chaetopleura. 5. The dorsal epidermis in mollusks is modified to form the mantle, which encloses the mantle cavity and visceral organs. Answer: The animals in phylum coelenterates have two layers the outer ectoderm and the inner endoderm in the body wall. The respiratory organs are the ctenidia. Between the foot and mantle cavity, in the pallial groove lies a number of gills. (d) Ques. 3. 2. Paired clusters of narrow, clubbed adhesive, contractile filaments, the captacula surrounding the mouth and are used in feeding. 6. Laterally compressed body enclosed within a pair of shell valves. Explain. The R.Q. List the respiratory organs of amphibians. Solen (Fig. 1. Excretory organs include a pair of saclike ‘kidneys’, opening proximally into the pericardium and discharging into the mantle cavity. In this article we will discuss about the Phylum Mollusca:- 1. Blood is colourless with amoebocytes. This cavity is quite distinct from the coelomic cavity, which in the adult animal surrounds the heart. 1.74), Mono- placophorus, Vema. 2. Our mission is to provide an online platform to help students to discuss anything and everything about Zoology. Name the excretory organ of Cephalo Chordata. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snail and marine snails. Absence of shell. 1.77A), Lymnaea (Fig. Residual air in rabbit is found in (a) Nostrils (b) Trachea (c) Bronchus (d) Alveoli View Answer Ans. The male and female sex organs can produce sperm and egg respectively in each earthworm. Invertebrate Gill 3. Attached by byssus threads or cemented to the substratum, some secondarily free. They are attached throughout the greater part of the mantle wall. 1.79D), Octopus (Fig. are solved by group of students and teacher of Class 10, which is … 3. Hermaphrodite animals have both male and female sex organs. 1. 1.76C). The small proboscis-like head lacks eyes and sensory tentacles. Does the clam have a respiratory organ? 1.77B), Ancylus. 26.35, 26.38). The situation is […] Nervous system concentrated and symmetrical. Diagnostic Features of Phylum Mollusca 3. Another way to prevent getting this page in the future is to use Privacy Pass. A chemo-receptive sense organ in the mantle cavity called the osphradium is present. Gills absent, but secondary gills in the form of folds or papillae are often developed. 12. Such a type of ctenidium is called bipectinate type. Vertebrate Gill. 1.78F), Cardium (Fig. 5. They are two in number. The surface of the respiratory structure is greatly increased to allow rapid absorption of O2. • 1.72A), Proneomenia (Fig.1.72B). 8. A muscular foot is present below the digestive system and visceral mass. Typically with a single pair of gonads, discharging the gametes into the mantle cavity.
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