Online test phylum PoriferaBy biochemistzeshan@gmail.com / July 26, 2024 Online test set 1 Quiz 1 / 30 The sessile form of cnidarians is known as Medusa Polyp Planula Ephyra 2 / 30 Which of the following is a primary threat to coral reefs? Predation by fish Ocean acidification Increased salinity Lack of sunlight 3 / 30 Which cnidarian class is known for forming coral reefs? Hydrozoa Scyphozoa Anthozoa Cubozoa 4 / 30 Which of the following is a key characteristic of the Anthozoa class? Only medusa form Colonial lifestyle Alternation between polyp and medusa forms Only polyp form 5 / 30 What is the role of the gastrovascular cavity in cnidarians? Excretion only Respiration only Digestion and circulatio Reproduction only 6 / 30 Which cnidarian class includes organisms with the most complex eyes? Hydrozoa Scyphozoa Anthozoa Cubozoa 7 / 30 In which type of cnidarian does the medusa stage dominate the life cycle? Hydrozoa Scyphozoa Anthozoa None of the above 8 / 30 Which cnidarian structure is primarily responsible for photosynthesis in coral reefs? Mesoglea Nematocysts Zooxanthellae Gastrovascular cavity 9 / 30 26. *Which of the following is a colonial hydrozoan?* Sea anemone Aurelia Physalia Chironex 10 / 30 The box jellyfish belongs to which class of cnidarians? Hydrozoa Scyphozoa Anthozoa Cubozoa 11 / 30 The alternation of generations in cnidarians typically involves which two forms? Ephyra and planula Polyp and medusa Medusa and ephyra Planula and polyp 12 / 30 Which of the following is NOT a typical habitat for cnidarians? Freshwater lakes Marine environments Deserts Coral reefs 13 / 30 How do cnidarians primarily reproduce? Asexually through fission Sexually and asexually Only sexually Only asexually 14 / 30 The presence of nematocysts is a defining feature of which phylum? Porifera Cnidaria Platyhelminthes Echinodermata 15 / 30 Which sensory structures are found in some cnidarians for balance? Ocelli Statocysts Nematocysts Mesoglea 16 / 30 Which of the following is a feature of the medusa form in cnidarians? Sessile lifestyle Cylindrical shape Umbrella-shaped body Colonial existence 17 / 30 Coral bleaching is primarily caused by: Overfishing Symbiotic algae loss Pollution Predation 18 / 30 Which of the following is NOT a characteristic of the Hydrozoa class? Alternation between polyp and medusa forms Presence of a thick mesoglea Colonial organization oth polyp and medusa stages are present 19 / 30 The gastrovascular cavity in cnidarians functions primarily in: Excretion Digestion and circulation Respiration Reproduction 20 / 30 Which class of Cnidaria is known for its potent venom and complex eyes? Hydrozoa Scyphozoa Anthozoa Cubozoa 21 / 30 What role do zooxanthellae play in coral reefs? Structural support Photosynthesis Reproduction Predation 22 / 30 Which cnidarian form is sessile and often forms colonies? Medusa Polyp Planula Ephyra 23 / 30 What is the primary mode of nutrition for cnidarians? Herbivory Parasitism Carnivory Filter feeding 24 / 30 The mesoglea in cnidarians serves primarily as a Digestive structure Protective layer Structural support Reproductive organ 25 / 30 In which cnidarian class are corals found? Hydrozoa Scyphozoa Anthozoa Cubozoa 26 / 30 Which structure is used by cnidarians to capture prey? Statocysts Ocelli Nematocysts Medusae 27 / 30 Which of the following classes includes the "true jellyfish"? Hydrozoa Scyphozoa Anthozoa Cubozoa 28 / 30 Cnidarians are considered diploblastic because they have how many germ layers? One Two Three Four 29 / 30 What is the primary function of cnidocytes in cnidarians? Respiration Locomotion Reproduction Defense and prey capture 30 / 30 Which of the following best describes the symmetry of cnidarians? Bilateral symmetry Radial symmetry Asymmetrical Spherical symmetry Your score isThe average score is 76% 0% Restart quiz Online test set 2 Quiz 1 / 12 Sponges belong to which phylum? Cnidaria Porifera Annelida Arthropoda 2 / 12 The skeletons of calcareous sponges are made of: Silica Calcium carbonate Spongin Keratin 3 / 12 Which cell type in sponges is primarily responsible for creating water currents and capturing food? Pinacocytes Choanocytes Amoebocytes Sclerocytes 4 / 12 Glass sponges belong to which class? Calcarea Hexactinellida Demospongiae Homoscleromorpha 5 / 12 Which of the following sponge classes is the most diverse, containing about 90% of all sponge species? Calcarea Hexactinellida Demospongiae Homoscleromorpha 6 / 12 The spicules of glass sponges are primarily composed of: Calcium carbonate Silica Spongin Keratin 7 / 12 In sponges, the asexual reproductive structure that can survive harsh conditions is known as: Gemmule Spicule Medusa Larva 8 / 12 Which of the following statements about Homoscleromorpha is true? They have a well-defined skeleton of spongin. They possess a distinct basal membrane. They possess a distinct basal membrane. They are the largest class of sponges. 9 / 12 Which of the following is an example of a calcareous sponge? Euplectella Spongilla Leucosolenia Cliona 10 / 12 Which class of sponges is known for its unique syncytial tissue structure? Calcarea Hexactinellida Demospongiae Homoscleromorpha 11 / 12 What type of symmetry do most sponges exhibit? Bilateral symmetry Radial symmetry Asymmetry None of the above 12 / 12 Which of the following is NOT a characteristic of sponges? Multicellular True tissues Filter feeders Aquatic Your score isThe average score is 71% 0% Restart quiz
