THE END OF CHAPTER BIODIVERSITY COMING NEXT CHAPTER IS ECOLOGY. (ii) Respiration is cutaneous, i.e. Respiratory Organ. Pheretima sp. Zoology Class 11 Chapter 2 Question 6. Each septum has about 40 to 50 nephridia in front and the same number behind, so that each segment possesses 80 to 100 septal nephridia except the 15th segment which has only 40 to 50 nephridia. Nephridia is the excretory organ. Class 11 Zoology Chapter 2 Notes Question 2. (c) They are used as fish meal. . In Pheretima the nephridia are . (ii) Integumentary nephridia - Scattered in the . A pair of such nephridia is arranged one on either side of the alimentary canal. T. Coleom. Pheretima, Leech-Alimentary canal, Reproductive, Excretory and Nervous systems. Sensory organs like antennae, eyes (compound and simple), statocysts or balancing organs are present. It comprises of the blood vessels, hearts, loops, blood capillaries and the blood glands. Body of nephridium consists of a short straight lobe and a long twisted lobe with a narrow apical part. Respiratory system of Earthworm There are no special respiratory organs in earthworm. Nephridia are porous, long, thin and coiled . Samacheer Kalvi Guru 11th Zoology Question 1. exchange of gases takes place through moist and thin skin supplemented by thin capillaries. Describe the various types of nephridia found in Pheretima. The nervous system consists of a nerve ring and a solid, double, mid-ventral nerve cord with ganglia and lateral nerves in each segment. Question 16. . Permanent stained preparation of the following: 05 Paramoecium gemmules, Spicules, obeliacolony, Nephridia and Ovary of Circulatory system is of open type. Category: School MCQs. Gizzard in Pheretima is an organ:-[CPMT- 80, 82, 84, 85, 90] A. Secretes slime. Nephridia of Earthworms are performing the same functions as - b. Flame cells of Planaria 6. (i) Extracellular and intracellular digestion. Open blood vascular system is present in Pheretima. •They are of three . What is the excretory organ in earthworm known as? MCQs: Terminal ducts of septal nephridia in earthworm open: Pheretima. The earthworm is a ureotelic animal but it excretes a mixture of ammonia, urea & creatinine. Unique Characteristics Respiratory system - gills or . R. Annelida. (a) (b) (c) Define double circulation. B. Excretory. . The body wall is thin and moist allowing the diffusion of gases of respiration using gills. Neural system consists of paired ganglia (sing. The body cavity, which is lined by mesoderm. Nephridia are present in all segments of the body except in first 3 segments and last segments. Respiratory organs are gills, book gills, book lungs, trachea. Ammonia is the chief excretory waste. Solution: (i) Nephridia is the excretory organ of the earthworm or pheretima. The symmetry exhibited in cnidarians is -. They are mostly dioecious. Cutaneous respiration. This is because the worm casting (faecal deposit) increases the fertility and burrowing helps in proper aeration of the soil. Open type of circulatory system is seen. It is used for feeding. Excretory system: •The excretory organs occur as segmentally arranged coiled tubules called nephridia (sing. Water vascular system . Excretion and osmoregulation is carried out with help of nephridia. In some animal groups, the body is found divided into compartments with serial repetition of at least some organs. Problem 32. (i) Pharyngeal nephridia - Situated on either side of pharynx and oesophagus in 4, 5 and 6 segments. (d) Asymmetrical. Which of the following is a common Indian earthworm? What is the excretory organ in earthworm known as? The red respiratory pigment, haemoglobin (or erythrocruorin) occurs dissolved in plasma. Obelia . Various types of nephridia and their Fig. Earthworm - Lampito mauritii Earthworm is a terrestrial invertebrate that inhabits the upper layers of the moist soil, rich in decaying organic matter. Earthworm lacks specialized respiratory organs. The life span of earthworm is 3-10 years. Phylum/Class Excretory organ Circulatory organ Respiratory organ Arthropoda A B Lungs/Gills/Tracheal system C Nephridia Closed Skin/parapodia D Metanephridia Open E Amphibia F Closed Lung Solution: A = Malpighian tubules . Fertilization is internal, e.g., Limulus and insects. Pharyngeal nephridia (i) The structure of pharyngeal nephridia is like the septal nephridia except that they have no nephrostomes. A septal nehridium of Pheretima arrangement in Pheretima Three main types of nephridia are : Pharyngeal nephridia, Integumentary nephridia, Septal nephridia. The exchange of respiratory gases takes place through the body surface, Thus earthworms show cutaneous respiration. (26) Excretory organs of earthworm are segmental nephridia ectodermal in origin, analogous to vertebrate kidney. Open type circulation is seen. (c) Trachea of insects. Over two thirds of all species on the earth are Arthropods 2. Respiratory. (b) Flame cells of Planaria. External Apertures of Pheretima. In Pheretima, nephridia occur in all the segments except the first two. Wasp and honeybee. 67. The excretory system consists of metamerically arranged nephridia. The Class 11 Biology Chapter wise notes have been prepared based on the latest syllabus issued for the current academic year by CBSE. ((Suneel Singh) The earthworms are long cylindrical worms of brownish colour which live in burrows in moist earth particularly that contains decaying vegetation or humus. Blood consists of plasma, RBC, WBC and Platelets. They remove metabolic wastes from an . a) Gizzard b) Typhlosole c) Nephridium d) Setae Answer: c Clarification: Nephridium is the excretory organ in earthworm. These tracheal tubules carry oxygen from the air to all the parts of their body. Nephridia for osmoregulation and excretion. They occur nephridia septa and reproductive organs and discharge into supra-oesophageal through anterior loops and ring vessels. exchange of gases takes place through moist and thin skin supplemented by thin capillaries. e.g., Annelids, Arthropods, Molluscs, Echinoderms and Chordates. (d) Nematoblasts of Hydra. B) False. (20) (b) Describe habitat, habits and life history of Branchiostoma. (b) They make the soil porous, leave their castings and take organic debris in the soil. 3. There are many apertures present in earthworm which have their own functions. (ii) Respiration is cutaneous, i.e. Nereis (Aquatic annelid), Pheretima (Earthworm), Hirudinaria (Leech). Earthworm have no special sence organs still they are sensitive to 1) Integumentary only 2) Septal & integumentary 3) Pharyngeal & Septal 1) Light and sound 2) touch and sound 3) Touch, taste and sound 4) Integumentary & Pharyngeal 68. Some of them are given below: Mouth: is a crescentic aperture, located on the ventral surface of the body, just below the prostomium and surrounded by peristomium. Each septal nephridium consists of nephrostome, neck, the body of nephridium and the terminal duct. The septal nephridia do not discharge the excretory fluid to the exterior. The anterior end is tapering, while the posterior end is more or less blunt. They have the red pigment haemoglobin which helps in the transport of respiratory gases mainly oxygen. Structure: The septal nephridia may be considered typical of all the nephridia of Pheretima. • Examples: • Nereis, Pheretima (Earthworm) Hirudinaria (Blood sucking leech Phylum - Arthropoda 1. 1. Typhlosole and gizzard are involved in digestion of food while setae help in locomotion. They open into the intestines. This vessel is muscular, valvular and . Earthworm is a reddish brown terrestrial invertebrate & a member of Phylum Annelida. View Answer Explanation. Forest of nephridia are not 1) Present . RBC - Red blood cells also called erythrocytes. (4) Pathway of water transport is helpful in gathering of food, respiratory exchange and removal of waste. Arthropoda: Largest phylum of kingdom Animalia, organ level of organization, bilaterally symmetrical, segmented, triploblastic animals, exoskeleton made up of . 5. Sub Category: Class 11 Biology Mcqs. Give a comparative account of heart in reptiles, In Pheretima posthuma three types of nephridia are present namely septal nephridia, integumentary nephridia and pharyngeal nephridia. In earth worm, pharyngeal nephridia begin from behind segments . This pore lies on the ventral or lateral surface of the segment. Respiration occurs through respiratory organs like gills, trachea, book lungs or book 15 15 HXS-U-ZOLY/13 . (b) Bilateral. Samacheer Kalvi Guru 11th Bio Zoology Question 5. (ii) Exclusively marine, radially symmetrical, diploblastic, tissue level of organization. A. Septal nephridia Largest nephridia of Pheretima. Respiratory organs are gills, book gills, book lungs or tracheal system. Define nephridium. Reproduction is sexual. Sensory organs include tactile organs, taste buds, statocysts, photoreceptor cells and eyes with lenses. A) True. During day time, it lives in burrows made by boring and swallowing the soil. (15) (c) Describe the respiratory organs and mechanism of respiration in Pila. It is nocturnal and during the day it lives in burrows made by burrowing and swallowing the soil. (2) Body is supported by endoskeleton made up of spicules or sponging fibres. These are ectodermal in origin and analogous to the vertebrate kidney.In Pheretima, following three types of nephridia are seen. 2. it dies due to asphyxia. First phyllum to have respiratory system and it occurs by 2 ways: 1)Cutaneous Respiration (skin)(more common) . e.g. Nephridia of Earthworms are performing the same functions as -. EARTHWORM : Pheretima posthuma The earthworms are long cylindrical worms of brownish colour which live in burrows in moist earth particularly that contains decaying vegetation or humus. Blood Vessels Blood vessels Of Pheretima posthuma may. What is septal Nephridium? nephridium) help in osmoregulation and excretion. lungs are respiratory organs. (ii) How many types of nephridia are found in earthworms based on their location? Organ system level - organs are associated to form functional systems, each system concerned with a specific physiological function. (a) Radial. Sea pen and sea fan. The excretory system of earthworms is made up of segmentally arranged microscopic slender coiled tubules called nephridia (or micronephridia). In Pheretima, nephrr ta or micronephridia. e.g., Sponges. These cells provide immunity against various disease-causing germs entering the body and provide immunity. (5) Hermaphrodite organism. Cactus and Venus fly trap. Alimentary canal of earthworm has: Buccal chamber in earthworm performs the. Nephridia occur as coiled tubules arranged segmentally. . Solution: (i) Nephridia is the excretory organ of the earthworm or pheretima. Fig. Palaemon - Alimentary canal, Nervous system. Answer: Molluscs are terrestrial or aquatic with an organ system level of organisation. (i) Pharyngeal nephridia - Situated on either side of pharynx and oesophagus in 4, 5 and 6 segments. Nereis, an aquatic form, is dioecious, but earthworms & leeches are monoecious. - b. Pheretima 7. . C. Offence and defence. They are mostly oviparous. Ascaris sp. Found situated on the intersegmental septum between 15 th and 16 th segments to the posterior side of the body. Sense organs are present. S. Mollusca. These are not found in the segments up to 14th. (1) Cellular level of organization. Click hereto get an answer to your question ️ Select the correct option representing the excretory organs present in (i) earthworm , (ii) centipede , (iii) prawn , and (iv) flatworm. Pheretima Posthuma. In the gardens, it can be traced by its faecal deposits known as worm castings. They are also common in agricultural fields where they increase the productivity of crops. The most common earth warm of India is Pheretima communissima Eutyphacus Pheretima posthuma Lumbricus Answer: 3 Q3. Nephridia are the excretory organs. If the skin of the earthworm dries, it cannot respire. Give a comparative account of heart in reptiles, birds and mammals. •Pheretima exhibits a closed type of blood vascular system, consisting of blood vessels, capillaries and heart. The blood vessels of the circulatory system of earthworm include longitudinal blood vessels, hearts, anterior loops and the ring vessels. Septal Nephridia A typical septal nephridium consists of Nephrostome or ciliated funnel that drains coelom. Nephridia for excretion and osmoregulation. Septal nephridia: These are found situated on the inter-seg­mental septum between 15th and 16th segments to the posterior side of the body. Sensory organs are simple . Asymmetrical- any plane that passes through the centre does not divide body into equal halves. The vascular system: It is a well-developed closed type. Metameric segmentation is the main feature of a. Annelida b. Echinodermata . MCQs: Animal which respires but has no respiratory organs is: Category: Central Superior Service Test Mcqs (CSS), Published by: T-Code Scripts. In earthworm, the excretory system is made up of many segmentally arranged microscopic coiled tubes called nephridia. The absorptive area of earthworm is more than its volume, so earthworm does not require any respiratory organ. 9. parapodia. Segments having male genital organs in P. Chlorogogen cells in Pheretima are equiv. Pharyngeal gland cells produce: a) Gizzard b) Typhlosole c) Nephridium d) Setae Answer: c Clarification: Nephridium is the excretory organ in earthworm. . 14. In Pheretima the chromophil cells serve . Nephridia are the excretory organs of earthworm, which are of three types, namely, septal, integumentary and pharyngeal. This characteristic feature is called. 16. roundworm. Describe the respiratory organs and mechanism of respiration in Pila. Examples: Pheretima (earthworm) Hirudinaria (blood sucking Leech) Neries (aquatic. NCERT Exemplar Class 11 Biology Chapter 4 Animal Kingdom. Body of nephridium consists of a short straight lobe and a long twisted lobe with a narrow apical part. Question 7. (15) 4:- (a) Define double circulation. 7 .Hirudinaria. They are ectodermal in origin. Blood is red in color due to the presence of respiratory pigment hemoglobin (erythrocruorin) in it. Earthworm is a terrestrial invertebrate that inhabits the upper layers of the moist soil, rich in decaying organic matter. Gnathostomata is classified into two super classes on the basis of locomotory organs, respiratory organs, heart and blood vascular . The heart is 3-chambered. Nephridia are analogous to kidneys of vertebrates. MCQs: Typhlosole in earthworm starts from segment numbering: Category: Central Superior Service Test Mcqs (CSS), Published by: T-Code Scripts. 4. Locusta (Locust), Anopheles, Culex and Aedes . Nephridia (sing. Sensory organs include tactile organs, taste buds, statocysts, photoreceptor cells and eyes with lenses. Nephridia occur as coiled tubules arranged segmentally. Fertilisation is usually internal. The nervous system consists of a nerve ring and a solid, double, mid-ventral nerve cord with ganglia and lateral nerves in each segment. Give the staicture of septal nephridia in earthworm. The Earthworms are burrowers. It totally depends upon the location and the earthworm's ability to thrive in their environments. Skin acts as aquatic respiratory organs (cutaneous respiration). Please refer to Animal Kingdom Class 11 Biology Notes and important questions below. (a) Gills of prawn. While on land, the buccal cavity, skin and lungs act as respiratory organs. (b) Define nephridium. Excretory organs of Cockroach and other insects are (1) Nephridia (2) Flame cells (3) Malpighian tubules (4) Gizzard Answer: (3)Malpighian tubules Explanation Malpighian tubules constitute the excretory organs of cockroach and other insects. 5. as compared to large-sized meganephridia of Nereis and lccch. These are ectodermal in origin and analogous to the vertebrate kidney.In Pheretima, following three types of nephridia are seen. 13. Excretory organs - Nephridia Circulatory system-open / close. Unio Pila and Sepia- Nervous system, organs of Pallial complex of Pila. Ans: (b) Metamerism: In some animals, the body is externally and internally divided into segments with a serial repetition of at . It gives a red colour to blood and aids in the transportation of oxygen for respiration. 14. : nephridium). (ii) Integumentary nephridia - Scattered in the . •Respiratory exchange occurs through moist body surface into their blood stream. Scorpion and cobra. It opens outside through the nephridiopore. An earthworm is a segmented worm; a terrestrial invertebrate belonging to the phylum Annelida. Describe the various types of nephridia found in Pheretima. Excretion by Nephridia. Name the respiratory organ of Mollusca. . Excretory system of Earthworm. It inhabits in the upper layer of the moist soil. WBC - White blood cells. For absorption of digested food. D. Organ system level i. Pheretima ii. It is thus nocturnal in habit. Paired ganglia connected by lateral nerves to a double ventral nerve cord. The circulatory or blood vascular system of an earthworm is a closed type. . Most of the excretory fluid is released into the alimentary canal from where it is sent out though anus along with the undigested food. 6. radula. (d) They kill the birds due to the biomagnification of chlorinated hydrocarbons. The nephridia are the excretory organs of earthworm. (ii) There are three types of nephridia - (i) Septal nephridia - Present on both the sides of intersegmental septa of segment 15 to the last that open into the intestine. The nephridia occur in pairs and performs a function similar to the vertebrate kidney. iv. 250+ TOP MCQs on Animals - Organs and Organ System and Answers. Parapodia for swimming). It prefers to live in burrow during daytime and at night and rainy season they come out of their shelter. Body of the nephridium which is long convoluted tube. Which of the following are enteronephric nephridia in pheretima 75. 9. Question 73. In Pheretima locomotion occurs with help of - c. circular, longitudinal muscles and setae 9. 7. (ii) There are three types of nephridia - (i) Septal nephridia - Present on both the sides of intersegmental septa of segment 15 to the last that open into the intestine. iii. The nephridia occur in all segments of earthworm exceptthe first two segments. Write the general characters of the phylum Mollusca. According to Darwin one acre of land may contain About 100,000 earth warms About 50,000 earth warms About 20,000 earth warms None of the above Answer: 2 Q2. Animal Types MCQ (Multiple Choice Questions and Answers) Q1. (c) Pentamerous radial. Nereis, an aquatic form, is dioecious, but earthworms and leeches are monoecious. Give the nature of eathworm concern to excretion. Nervous System. Earthworms are commonly called as farmer's friend. mesoderm and ectoderm. 13. They are the common inhabitants of moist soil and feed on organic matter. Nephridia are the excretory organs. Spongilla iv. Pharyngeal cavity of earthworm is: Salivary chamber in Pheretima is the par. Clarification: The common Indian earthworms are Pheretima and Lumbricus. 2. . Which of the following animals has a true coelom ? Consists of Coiled Tubular Structure called Nephridia. Typhlosole and gizzard are involved in digestion of food while setae help in locomotion. The nervous system comprises the brain and double ventral nerve cord. There are three types of nephridia in the earthworm: septal nephridia, present on both the sides of intersegmental septa of segment 15 to the last that open . Cockroach respiratory organ is trachea. Answer (1 of 2): Earthworm - Wikipedia There is an enormous variance between different earthworm species. Biology Multiple Choice Questions on "Animals - Organs and Organ System - 1". Students should revise these notes and go through important Class 11 Biology examination questions given below to obtain better marks in exams 5. Reproduction is sexual. Excretion takes place through malpighian tubules. ii. D. Reproduction. They are also common in agricultural fields where they increase the productivity of crops. Answer: (a) Radial. Biconcave cells that are devoid of mitochondria. No special respiratory organs are present in Pheretima. No respiratory or excretory systems No circulatory. Pheretima posthuma has long, elongated, cylindrical narrow body which is bilaterally symmetrical. EARTHWORM: Pheretima posthuma. It consists of the blood vessel, heart, capillaries, and blood glands. 8. C. . The common Indian earthworms are B. Blood is composed of fluid plasma and colorless corpuscles. Circulatory system of earthworm. Pheretima posthuma (Earthworm): Ureotelic under normal soil condition and ammonotelic in water saturated soil called Natures' of plough man. Blood vascular system is different in first 13 segments as regards to number, arrangements and nature of blood vessels. Largest phylum. Answer: (b) Flame cells of Planaria. In gardens, they can be traced by their faecal deposits known as worm castings on the soil . (15) (earthworm) is highly useful as. According to Dr. Bahl, the ratio of urea, ammonia & creatinine is 55%, 40% & 5% respectively. Nephridia is the excretory organ of the earthworm or pheretima. The longitudinal blood vessels: These blood vessels include, Dorsal blood vessel- It is the largest vessel in the body extending along the mid dorsal line above the gut. be conveniently grouped into three types (1) longitudinal, (2) lateral, and (3) intestinal plexuses. Hope the information shared regarding the NCERT MCQ Questions for Class 11 Biology Chapter 4 Animal Kingdom with Answers Pdf free download is true and genuine as far as our knowledge is concerned. Consists of a nerve ring with Solid, Mid, Ventral Nerve Cord with Ganglia. (a) Their burrows make the soil lose. Answer : C (Sea pen and sea fan) Question 23: The characters given below are shown by. Nephridia are the most generally found excretory organs in earthworms. (ii) How many types of nephridia are found in earthworms based on their location? Mollusca: Aquatic or terrestrial, organ level of organization, bilaterally symmetrical, triploblastic animals, unsegmented body, Nephridia are the excretory organs of earthworm, which are of three types, namely, septal, integumentary and pharyngeal. The septal nephridia may be considered typical of all the nephridia of Pheretima. b. Symmetry 1. Earthworm - Lampito Mauritii. Excretory organs of earthworm are segmental nephridia, ectodermal in origin, analogous to vertebrate kidney. respiratory organs found such as gills, book gills, book lungs or tracheal system, hemolymph is present, Malpighian tubules are meant for excretion . Each septum bears nephridia on both the surfaces arranged in semicircles around the intestine, two rows in front of the septum, and two behind it. Fasciola iii. Ammonia is chief excretory waste. In earthworm, the nephridia functions for the removal of the excretory wastes both from blood and the coelomic fluid. Q1. ===== ganglion) connected by lateral nerves to a double ventral nerve cord. Nephridia which helps in excretion Hirudinaria, Nereis, Pheretima: Fig. . Metameric segmentation is the main feature of -a. Annelida 8. Examples : Nereis, Pheretima (Earthworm) and In earthworm, the excretory system is made up of many segmentally arranged microscopic coiled tubes called nephridia. Fig. No special respiratory organs are present in Pheretima. However, the general taxonomic structure of earthworm evolution is laid out quite nicely by . a. Ctenidia b. Gills c. Book lungs d. Trachea Answer: a. Ctenidia. Locomotory organs are setae (in earthworm) or parapodia (in Neries). A typical septal nephridium consists of Nephrostome or ciliated funnel that drains coelom. The blood vascular system is of closed type and the haemoglobin is the respiratory pigment. 8 .Locusta. It is nocturnal and during the day it lives in burrows made by burrowing and swallowing the soil. Pharyngeal nephridia (i) The structure of pharyngeal nephridia is like the septal nephridia except that they have no nephrostomes. (3) Larva stage is morphologically different from adult. Circulatory system of the earthworm: In earthworm, the blood vascular system is of closed type. Pheretima is a terrestrial earthworm, liv­ing in burrows made in moist soil. They are, however, absent in regions where the soil is sandy and deficient in humus. 6. , nephridia occur in all segments of the soil current academic year by CBSE year by CBSE colour! Be traced by their faecal deposits known as following is a closed type agricultural fields they. 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Moist body surface into their blood stream asymmetrical- any plane that passes through the body nephridium! To all the nephridia functions for the current academic year by CBSE segments to the posterior is... Aquatic form, is dioecious, but earthworms & amp ; leeches are monoecious Multiple Choice Questions &... 6 segments drains coelom diffusion of gases takes place through moist and thin skin supplemented by thin capillaries ( pen. ; Animals - organs and organ system level of organization ( aquatic of pharynx and oesophagus in 4 5! Setae Answer: ( i ) pheretima respiratory organ nephridia is the excretory organ of the following Animals has a true?... ) lateral, and blood glands, 5 and 6 segments Kalvi 11th Bio Zoology Solutions Chapter 2 <. Be traced by its faecal deposits known as worm castings on the earth are Arthropods 2 and. 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