Free Online test of phylum porifera(sponges) and their classificationBy waqas ali / July 24, 2024 Quiz 1 / 37 Which of the following sponge classes is the most diverse, containing about 90% of all sponge species? Calcarea Hexactinellida Demospongiae Homoscleromorpha 2 / 37 Which cell type in sponges is primarily responsible for creating water currents and capturing food? Pinacocytes Choanocytes Amoebocytes Sclerocytes 3 / 37 The skeletons of calcareous sponges are made of: Silica Calcium carbonate Spongin Keratin 4 / 37 What type of symmetry do most sponges exhibit Bilateral symmetry Radial symmetry Asymmetry None of the above 5 / 37 Sponges belong to which phylum? Cnidaria Porifera Annelida Arthropoda 6 / 37 Which of the following is NOT a characteristic of sponges Multicellular True tissues Filter feeders Aquatic 7 / 37 Which sponge product has potential pharmaceutical applications? Spongin Silica Bioactive compounds Calcium carbonate 8 / 37 Sponges are used in research due to their ability to: Produce oxygen Regenerate tissues Photosynthesize Move rapidly 9 / 37 Which structure helps sponges adhere to surfaces? Spicules Osculum Basal disc Mesohyl 10 / 37 The larval stage of a sponge is known as: Medusa Polyp Amphiblastula or parenchymula Planula 11 / 37 Which sponge body form is the simplest and least efficient for filter feeding? Asconoid Syconoid Leuconoid None of the above 12 / 37 The ability of sponges to regenerate lost parts is due to: Specialized reproductive organs Totipotent amoebocytes Hard spicules Choanocytes 13 / 37 Gemmules are primarily found in which type of sponge? Marine Freshwater Terrestrial Deep-sea 14 / 37 Sponges help maintain water clarity by: Consuming large fish Filtering bacteria and particles Producing toxins Absorbing light 15 / 37 What ecological role do sponges play in aquatic ecosystems? Predators Parasites Primary producers Filter feeders 16 / 37 What is the role of spicules in sponges? Reproduction Locomotion Structural support Digestion 17 / 37 Most sponges are: Dioecious Monoecious Asexual None of the above 18 / 37 Sponges reproduce asexually by: Fission Fragmentation Budding and gemmules All of the above 19 / 37 Which of the following statements is true about Calcarea? They are exclusively found in freshwater. They possess only silica-based spicules. hey can exhibit asconoid, syconoid,… hey are the most complex and diverse group of sponges. 20 / 37 Which class of sponges can possess spicules, but some species lack them entirely? Calcarea Hexactinellida Demospongiae Homoscleromorpha 21 / 37 Sponges that can survive in freshwater belong primarily to which class? Calcarea Hexactinellida Demospongiae Homoscleromorpha 22 / 37 The spicules of Demospongiae are primarily made of: Calcium carbonate Silica Spongin Keratin 23 / 37 Which sponge class is mostly found in deep-sea environments? Calcarea Hexactinellida Demospongiae Homoscleromorpha 24 / 37 11. Sponges with calcium carbonate spicules belong to which class? Demospongiae Hexactinellida Calcarea Homoscleromorpha 25 / 37 Which cell type in sponges is involved in nutrient transport and spicule formation? Choanocytes Pinacocytes Amoebocytes Porocytes 26 / 37 Which structure in sponges allows water to exit the body Ostia Osculum Porocytes Spicules 27 / 37 8. The central cavity of a sponge through which water flows is called: Osculum Spongocoel Atrium Canal 28 / 37 7. Which of the following is a true statement about sponges? They have true tissues and organs. They exhibit cephalization. They are sessile as adults. They are exclusively freshwater organisms. 29 / 37 6. The gelatinous matrix within a sponge is known as: Pinacoderm Mesohyl Choanodem Osculum 30 / 37 Sponges lack which of the following features? Nervous system Circulatory system Digestive system All of the above 31 / 37 Which class of sponges is the least studied due to its small number of species? Calcarea Hexactinellida Demospongiae Homoscleromorpha 32 / 37 The commercial bath sponge is typically a member of which class? Calcarea Hexactinellida Demospongiae Homoscleromorpha 33 / 37 Which class of sponges is known for its leuconoid body form exclusively? Calcarea Hexactinellida Demospongiae Homoscleromorpha 34 / 37 The spicules of Hexactinellida are characterized by having: Four rays six ray eight rat no ray 35 / 37 Spongers primarily obtain there food through Extracellular Intracellular Both extracellular and intracellular No digestion occurs 36 / 37 Which oof the following is the outermost layer of sponges Mesohyl Pinacoderm Gastrodermis Spongocoel 37 / 37 which is the primary function of of choanocytes in spongers Structural support Reproduction Water circulation and food capture Defense Your score isThe average score is 81% 0% Restart quiz
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