The leuconoid type is considered the major plan for sponges because it permits greater size and more ef. On the basis of the chemical nature of spicules types of the skeleton they possess, phylum porifera has been further divided into the following classes. Has an outer epidermis has an inner gastrodermis which forms a gastrovascular cavity has a middle jelly filled layer called mesoglea cnidocytes cnidarians are predators which have tentacles possessing batteries of special cells called cnidocytes cnidocytes contain special stining. Porifera are typically marine, sessile animals with a most unusual body that is porous. Phylum porifera mcq multiple choice question and answer phylum porifera mcq with detailed explanation for interview, entrance and competitive exams. Cnidarians exhibit either the polyp or medusa body plan. A body plan is a group of structural and developmental characteristics that. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.
Identify the two general body forms found in the cnidaria describe the identifying features of the major cnidarian classes phylum cnidaria includes animals that exhibit radial or biradial symmetry and are diploblastic, meaning that they develop from two embryonic layers, ectoderm and endoderm. Download objective type questions of phylum porifera pdf visit our pdf store. Feeding filter feeders plankton, algae, protists, bacteria digested. The invertebrates, or invertebrata, are animals that do not contain bony structures such as the cranium and vertebrae. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Phylum porifera characteristics, types, functions and. Body plan bilateral symmetry, a defined head and tail region and cephalization a concentration of nerve tissue in the head area resembling a primitive brain acoelomates meaning without coelom a coelom is a fluid filled body cavity that is lined with tissue. In between these two layers, there is a gelatinous and noncellular mesoglea containing numerous free amoeboid cells. Which type of skeleton is the model for a bathtub sponge. General characteristic features of phylum porifera online. Sponges have multiple cell types that are geared toward executing various metabolic functions. Phylum porifera pori pores, fera bearers are popularly known as sponges. Multicellular cells without cell walls diploid organisms with development proceeding via a blastula.
Chapter 8 phylum porifera to protect the rights of the authors and publisher we inform you that this pdf is an uncorrected proof for internal business use only by the authors, editors. They vary in size from less than a centimeter to a mass that can fill your arm. Digestion in sponges occurs intracellularly, mainly on choanocytes and archaeocytes due to phagocytosis and pinocytosis. Skeleton consists of calcareous spicules made up of carbonate of lime. So, while there are only three variations between the overall body plan within the phylum porifera, there is a huge variety in the body shapes that porifera may come in. Organisms belonging to this phylum do not have specialised digestive, nervous or circulatory system. Phylum porifera objective type questions pdf download. The central body cavity is lined with collar cells called choanocytes.
But still sponges are more than colonies of independent cells. Nov 19, 2019 at a very basic level of classification, true animals can be largely divided into three groups based on the type of symmetry of their body plan. These considerations place a physical constraint on cell size. Although cnidarians come in many shapes and sizes, they share a basic body plan. They all are marine, shallow and coastal water species. Moves freely forms of cnidarians body plan basic body plan. Larval sponges are freeswimming, but the adults are sessile, in other words, anchored in place. Only a few animal groups display radial symmetry, while asymmetry is a unique feature of phyla porifera sponges.
The basic cnidarian body plan is a sac with a central digestive compartment, the. These organisms show very simple organization, with a rudimentary endoskeleton. The body structure of sponges is designed in such a way that water moves through the body, where it can filter out food and also absorb the dissolved oxygen, along with eliminating waste material. Atkinson lj and sink kj eds field guide to the ofshore marine invertebrates of south africa, malachite marketing and media, pretoria, pp. Cnidaria 68 pennatulacea sea pen body plan scyphozoa jelly. The cells in the outer layers can move inward and change function. Dec 10, 2017 phylum porifera is classified into three classes on the basis of skeleton or spicules they possess. Familiar as sponges, these animals are wellknown for their ability to absorb and withhold fluids. A free powerpoint ppt presentation displayed as a flash slide show on id. Porifera have no real body layers but they do have 2 cell layers. Another name for these similarities is bauplan, which is the german word for body plan. May 29, 2017 the adult body wall contains two layers, outer dermal layer and inner gastral layer. The body is cylindrical or vase shaped with bristly outer surface. Body plan body is a network of pores, canals and passageways no mouth water is.
Polyps fused into leaves rachis peduncle end bulb radial canal lappet oral arm exumbrellabell subumbrella margin of bell oral arms terminal club epaulette order semaeostomeae order rhizostomeae. Animals included in phylum porifera are parazoans because they do not show the formation of true tissues except in class hexactinellida. The phylum porifera sponges powerpoint presentation covers the following topics and more. Sponges are basal metazoa lacking true organs and a ner. Porifera sponges por pore fere bearing body plan 7 characteristics 1. References textbook pages 520521, lab manual pages 160162. Body is vase shaped and comparatively simple in structure. They are often small and delicate, with thin coalescent. Following types of cells are present in phylum porifera. Describe the life cycle of a sponge, from reproduction sexual only to larval and adult stages.
Notochord supports body nervous system develops from dorsal nerve cord embryos have pharynx with slits embryos have tail that extends past anus three subphyla two invertebrate subphyla 1. Compressed polygonal cells called pinacocytes make up the pinacoderm, the external sac layer. Class calcarea exclusively marine, calcareous sponges predominantly inhabit shallow tropical waters. Porifera authors touiek samaai 1, robyn payne2, seshnee maduray, and liesl janson citation samaai t, payne rp, maduray s and janson l. This is such a simplistic structure because the body plan has only one large internal chamber, called a spongocoel, that is lined with waterfiltering choanocyte cells. This is our first group of metazoans animals criteria based on. These are exclusively marine and mostly live in shallow seawater. Choose from 500 different sets of porifera flashcards on quizlet. Porifera use canals and pores diffusion to perform life functions. Invertebrates i page 6 of 15 the life cycle of a typical cnidarian alternates between an often sessile polyp stage and a freeswimming medusa stage. Meaning of phylum name classification sponge diversity body structure filter feeding types of cells body forms of sponges t.
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