1.78E), Lima, Pecten (Fig. 1. Foot absent or reduced to a ventral ridge. Please enable Cookies and reload the page. Lamellidens is an aquatic animal, hence, it respires by the oxygen dissolved in water, i.e., the mode of respiration is aquatic exclusively. 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. Question 11. 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). Majority are aquatic animals with a few being terrestrial. a Zoology A comblike structure, such as the respiratory apparatus of a mollusk or a row of spines in some insects. 2. Development indirect via trochophore and veliger larval stages or secondarily direct. 4. The situ­ation is […] RESPIRATORY ORGANS IN ANIMALS The most common respiratory organs found in animals are the general body surface, gills, tracheal tubes and lungs. Question: What is the respiratory organ of mollusks? (d) Ques. Gills absent, but secondary gills in the form of folds or papillae are often deve­loped. The most obvious organs of the mantle are the paired ciliated gills or ctenidia. Eyes and ten­tacles are absent. 1.78D), Ostrea (Fig. In this article we will discuss about the Phylum Mollusca:- 1. 3. The respiratory organs are in the form of one or more ctenidia gills housed in the mantle cavity and pulmonary sacs. 1. The ciliary tracts on the filaments draw respiratory water currents into the mantle cavity on either side. Hermaphrodite animals have both male and female sex organs. Mantle cavity occupies a forwardly facing position, with the anus and kidneys discharging anteriorly. Answer: False. Kidney of molluscans are Metanephridia known as Kaber's organs or Organ of Bojanus. Arthropods. The small proboscis-like head lacks eyes and sensory tentacles. The gills in all other bivalves (save septibranchs, which have lost their gills) are greatly enlarged and possess a huge surface area. Sepia (Fig. 2. The surface of the respiratory structure is greatly increased to allow rapid absorption of O2. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. 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. Possess a pair of palpal tentacles (Fig. Visceral mass is twisted at 180° in an anticlockwise direction (torsion), relative to the head and foot. Answer: True, 3. 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. Invertebrate Gill 3. Although earthworms are hermaphrodites, most need a mate to reproduce. 2. Solution: The respiratory organ of scorpion is book lung. Presence of a tubular, tusk-like shell, open at both ends. 13. 5. Bivalvia (/ b aɪ ˈ v æ l v i ə /), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. Gills absent, instead a part of mantle serves for gaseous exchange. Dorsal surface covered by eight shell plates. Answer: False. Neopilina (Fig. Books lungs are formed by invaginations of cuticle at the bases of rudimentary appendages. Diagnostic Features of Phylum Mollusca 3. Head distinct but poorly developed and without sensory tentacles and eyes. Answer: The animals in phylum coelenterates have two layers the outer ectoderm and the inner endoderm in the body wall. Classification 4. To keep watching this video solution for FREE, Download our App. The aquatic respiratory structures may […] 1. 1.77C), Umax (Fig. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Introduction . for one gram mole of glucose is R.Q.= 6CO 2 /6O 2. 7. Systematic Resume. A clam has an open circulatory system. 6. Respiration in Mollusca is provided by gills or lungs, or both. Laterally compressed body enclosed within a pair of shell valves. List the respiratory organs of amphibians. On the sides of the foot are present five to six pairs of monopectinate ctenidia. 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'. 1.77A), Lymnaea (Fig. Head indistinct and a radula is absent. The respiratory organ consists of two gills or ctenidia situated one on each side of the body (Figs. columella. Foot blade-like in burrowing species and reduced in attached forms. 2. Adult fishes chiefly depend on pharyngeal gills for aquatic respiration. The respiratory organs are in the form of one or more ctenidia gills housed in the mantle cavity and pulmonary sacs. Content Guidelines 2. 3. The two currents 4. Each gill consists of a series of paired delicate lamellae along an axis. Why the clam is called a filter feeder? Such a type of ctenidium is called bipectinate type. The surrounding mantle forms a thick ‘girdle’, the cuticle. 1. 3. That is why it is also called the snail's respiratory cavity. Aquatic Respiration: In this, O2 dissolved in water is used. Does the clam have a respiratory organ? Aquatic Animals 2. Our mission is to provide an online platform to help students to discuss anything and everything about Zoology. Welcome to NotesOnZoology.com! 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. 8. 1.100). There are numerous gills or ctenidia in the respiratory organs usually provided with osphradium at the base. They are plume- shaped structures having numerous paired, delicately folded lamellae (see Fig. Shell is in one piece and asymmetrically spiralled. Performance & security by Cloudflare, Please complete the security check to access. Presence of inner nacreous layer in the shell. From a grazing base, molluscs have radiated to deposit feeders, suspension feeders (using gills as filters), carnivores and a few are parasites. Aquatic Animals: Small aquatic animals, protozoa and some­what large forms, viz. Excretory matter is ammonia or uric acid. Presence of one gill, one auricle and one nephridium. 1.81), Murex (Fig. d. mantle and shell. 1.78C), Pinctada (Fig. Valves equal with a few large cardinal teeth separated from the elongated late­ral teeth, by a toothless space. a. Mesonephridia b. Metanephridia c. Protonephridia d. Flame cells Answer: d. Flame cells. The ctenidium is situated on the dorsolateral wall … Name the organism which has both features of chordate and non-chordates? 4. Strictly speaking, a ctenidium is a respiratory structure that includes ciliated filaments. Some aquatic gastropods possess one ctenidium known as monopectinate and others have a pair of ctenidia known as bipectinate. 1.73), Loricata, Lepidopleurus, Chaetopleura. Various degrees of detorsion displayed with viscera and nervous system secon­darily unwounded. ACCESSORY RESPIRATORY ORGANS. Aplysia (Fig. Question 12. 2. chemo/tactile receptor next to ctenidia. Except in cephalopods, the circulatory system is open type. RESPIRATORY QUOTIENT. Phylum Mollusca has been classified differently by different authors depending upon the characters of foot, mantle, shell, muscles, radula, nervous system and respira­tory organs. osphradium. (1999) has split Aplacophora into two classes Chaetodermorpha and Neomeniomorpha. Privacy Policy3. Phylum Mollusca is one of the most conspicuous invertebrate animals. 4. 1.78 A). Show Answer A ctenidium is a respiratory organ or gill which is found in many mollusks. A chemo-receptive sense organ in the mantle cavity called the osphradium is present. 1.79D), Octopus (Fig. In terrestrial forms the lung develops. Presence of a single gonad and develop­ment is direct. 6. 1. A ctenidium is a respiratory organ or gill which is found in many mollusks. ... operculum and ctenidia 3. developed respiratory … Aquatic Respiration 2. 2. jalaldeen361976 jalaldeen361976 12.10.2020 Science Secondary School answered Ctenidia are respiratory organs 1 See answer jalaldeen361976 is waiting for your help. 1.79E), Loligo (Fig. Reduction and loss of shell and mantle cavity. So, for performing this life activity, Lamellidens possesses a pair of ctenidia or gills; mantle also helps in this activity. Type # 1. What does ctenidium mean? 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 16.39). Neomenia (Fig. Can you explain this answer? In the digestive sys­tem, buccal mass contains a scraping radula. 26.35, 26.38). What type of respiratory organ? The gills are plume-shaped (Figs. Between the foot and mantle cavity, in the pallial groove lies a number of gills. 12.A mollusca differs from other by. ... all of the internal organs that sit atop a muscular foot. Worm like mollusc, body covered by cuticle. 8. (noun) Valves equal with a few hinge teeth. Mantle cavity on the right side is con­verted into an air-breathing lung with a contractile opening, the pneumostome. Answer. Classification of Phylum Mollusca 2. Adductor muscles more or less equally developed. The R.Q. 1. 16.31 and 16.32A). They occupy virtually every habitat available to animals, except the air. The mantle cavity contains a single pair of bipectinate ctenidia. 1. Shell and usually an operculum covering the shell mouth are present. 9. 15. 5. 8. They are two in number. 1.75A), Haliotis (Fig. • Which of the following is a respiratory organ of scorpion (a) Gill (b) Lung (c) Ctenidia (d) Book lung View Answer Ans. Presence of two ctenidia, two auricles and two kidneys. The elongated body completely enclosed by the mantle. Correct statement: Trachea are the respiratory organ of Arthopoda. 5. Mouth provided with two pairs of labial plaps. Image Solution. are solved by group of students and teacher of Class 10, which is … Question 5. 4. Attached by byssus threads or cemented to the substratum, some secondarily free. 1.72A), Proneomenia (Fig.1.72B). The male and female sex organs can produce sperm and egg respectively in each earthworm. The visceral mass remains enclosed by a thick muscular fold of the body wall .called mantle. 6. 5. 1.75B), Pila (Fig. Residual air in rabbit is found in (a) Nostrils (b) Trachea (c) Bronchus (d) Alveoli View Answer Ans. Possess a single gonad that discharges via the right kidney. Patella (Fig. Organ rasping, usually occurring radula or in pelecypoda. Answer: The respiratory organs of amphibians are gills, lungs, skin and pharyngeal region. On the ventral side, is a weakly muscu­lar, circular foot surrounded laterally and posteriorly by an extensive mantle cavity. 3. Respiratory organs of scorpions are . Some mollusks have evolved a reduced shell. Absence of shell. 2. 7. A well-developed flat, crawling foot present. 1.79F), Argonauta (Fig. Anodonta, Trigonia, Mutela, Elliptio, Lamellidens. Explain. 3. Presence of one or two gills within the mantle cavity anterior to the heart. 3. Disclaimer Copyright, Zoology Notes | Exclusive Notes on Zoology for Students, 6 Main Classes of Phylum Mollusca | Zoology, Phylum Ctenophora: Classification and Features | Marine Animals, Phylum Mollusca: Features and Classification, Phylum Mollusca and Its Classification | Coelomates | Zoology. Blood has a copper containing, blue respiratory pigment Haemocyanin. Trachea are the respiratory organ of Annelida. In some cases, it may be internal and covered by tissue or secondarily reduced or lost. Head distinct with one or two pairs of tentacles and eyes. sponges and hydras, in which water current bathes the cells, a defi­nite respiratory structure is absent. 1. 1. 1.76B), Doris (Fig. 1. 5. 4. a. Ctenidia b. Gills c. Book lungs d. Trachea Answer: a. Ctenidia. An open blood system with a heart enclosed by the pericardium is present, through which the intestine also passes. ... Ctenidia. Answer: The respiratory organs of amphibians are gills, lungs, skin and pharyngeal region. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. Correct statement: Bipinnaria is the larva of star fish. Foot modified into a series of prehensile arms or tentacles and siphon. From the large ventral opening of the shell projects the conical or cylindrical burrowing foot and buccal region. They are attached throughout the greater part of the mantle wall. 1.75D), Cypraea (Fig. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Mytilus (Fig. Presence of a protective external dorsal shell. 1.77B), Ancylus. Achatina, Helix (Fig. 4. In terrestrial molluscs this respiration organ is reduced, but still respiration takes place in the pallial cavity. Paired clusters of narrow, clubbed adhe­sive, contractile filaments, the captacula surrounding the mouth and are used in feeding. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snail and marine snails. The respiratory organs are the ctenidia. 3. 3. 4. On the posterio-median end of the foot, anus is present. 2. 2. 1. 2. Head poorly marked and without eyes or sensory tentacles. It acts as a respiratory organ in certain forms where there is no special respiratory device. Respiratory System of Unio: Unio is exclusively an aquatic animal. 6. A muscular foot is present below the digestive system and visceral mass. Your IP: 138.68.27.135 7. Mantle cavity and contained organs are located anteriorly. So they are called diploblastic animals. In answer to Butterfield's claim that the respiratory organs round the foot could not be molluscan ctenidia because these mainly cellular structures would not have fossilized in the Burgess Shale conditions, they wrote that: fairly soft cellular tissue belonging to the stomach is fossilized in many Odontogriphus specimens; some molluscan gills are stiffened by non-cellular material, for example in polyplacophorans. Shell usually present but operculum lacking. 9. ADVERTISEMENTS: In this article we will discuss about the mechanism of gas exchange in various animals:- 1. Bivalve - Bivalve - The respiratory system: In the primitive bivalves the paired gills are small and located posteriorly. 1.74), Mono- placophorus, Vema. 2. 2. Bipinnaria is the larva of Mollusca. 1.78F), Cardium (Fig. 1.79 A). Latin: molluscus, a soft nut or soft fungus. 1. 1.78B). Barnes et al. Vertebrate Gill. Aschelminthes, General Zoology, Marine Animals, Phylum Mollusca, Zoology.

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