Dec 10, 2017 body of sponge has a large spacious cavity called spongocoel or paragastric cavity which opens through osculum at the top. There are following characteristics of the phylum porifera. Specialized cells in the body wall through which water enters 4. They are asymmetrical, some are radially symmetrical. Because the cell is the elementary unit of life, the evolution of organisms larger than unicellular protozoa arose as an aggregate of such building units. Taxonomy phylum porifera class demospongiae common name. Freshwater forms are found in small, slimy masses attached to sticks, leaves, or other objects in quiet ponds and streams classification of the phylum porifera class calcarea calcarea gr. Examine slides of hydra phylum cnidaria, a diploblastic animal and lumbricus the common earthworm, phylum annelida, a triploblastic animal and see if you can identify and label the tissue layers. Phylum porifera mcq question with answer pdf download. Station 5 phylum porifera level of organization cellular level tissue layers no true tissues type of digestive system none what type of digestion do they have. Therefore, acoelomate organs are not protected from crushing forces applied to the animals outer surface. But the cells have differentiated to result in a division of. Have a clearly defined head region responsible for sensing and responding to changes in the environment. Water will than move into canals that are lined with choanocytes flagellated collar cells called.
The body of the cnidarians is internally lined by gastrodermis, which is respon sible for the digestion that occurs both in the gastrovascular cavity and inside the. Phylum porifera the sponges the sponges are not considered as being on a direct evolutionary line toward higher animals. Calcareous sponges class hexactinellida common name. Porifera cellular level of body organization asymmetrical entire body or radial not perfect middle layer mesohyl. Members of this phylum are multicellular and possess a few tissues with no organs. Support for the soft structures of the sponge body is. Water entering the spongocoel is extruded via a large common opening called the osculum. Phylum porifera characteristics, types, functions and. Porifera use canals and pores diffusion to perform life functions. Rotifers are microscopically small aquatic animals. They are generally marine and mostly asymmetrical animals figure 4. Phylum porifera pori pores, fera bearers are popularly known as sponges.
Syconscypha, euspongia bath sponge, spongillafresh water sponge fig. Functions like endoskeleton, but is not considered cellular layer. Body cavity germ layer phylum absent diploblastic porifera absent triploblastic. In a simple sponge, the pores lead into a central body cavity filled with water. Phylum lab 3 porifera sponges the phylum porifera consists only of sponges, which is unique since these animals are entirely aquatic. Question bank for neet biology kingdom animalia phylum.
General characteristic features of phylum porifera. The phylum name is a reference to the many pores or holes that penetrate their bodies. Hydra cross section endoderm, ectoderm, gastrovascular cavity 3. There are many advantages to multicellularity as opposed to simply increasing the mass of a single cell.
The representatives of phylum porifera are also known as sponges. They have no true body cavity and all the cells and tissues surround a water filled space. Water enters this cavity through the pores and exits by a large vent. Coelom fluid filled body cavity, lined with tissue derived from mesoderm.
The sponges sponges are the simplest multicellular animals. They have cellular level of organization and cellaggregated body plan. Mouth opens into large gut gastrovascular cavity all cnidarians are carnivorous and capture live prey by using nematocysts definitive feature of the phylum a small barb is ejected to poison the prey. If it is lined entirely with tissue formed from the. Their body is asymmetrical or radially symmetrical with a variety of sizes and colors. Acoelomates lack a fluidfilled body cavity between the body wall and digestive tract. The body appears cylindrical that exhibits radial symmetry. Identify the anatomical structures of planarians, flukes, and tapeworms.
They vary in size from less than a centimeter to a mass that can fill your arm. Nematodes round worms and rotifers are in this group. Station 3 phylum porifera level of organization cellular level tissue layers no true tissues type of digestive system none what type of digestion do they have. Key features gastrovascular cavity feedingdigestion gas exchange hydrostatic skeleton water pressure only only one opening mouth simple. Intracellular type of excretory system none type of circulatory system none type of respiratory system none type of nervous system none, local reactions type of body cavity none. Animals in this phylum are asymmetrical and lack true tissues. The phylum name is a reference to the many pores or. Water enters through minute pores ostia in the body wall into. With the exception of the phylum porifera sponges, all animals have tissues.
Be able to recognize and name each of the 3 sponge body types i. Watch learning videos, swipe through stories, and browse through concepts. Phylum porifera mcq question with answer phylum porifera mcq with detailed explanation for interview, entrance and competitive exams. Body cavity germ layer phylum absent diploblastic porifera absent. Hydra whole mount mouth, tentacles, bud if present 2. The mouth leads to the gastrovascular cavity, which may be sectioned into four interconnected sacs, called diverticuli. The middle layer in body wall of porifera is aiims 1999 a. Sponges are considered the oldest and of the animal phyla. Porifera, cnidaria, ctenophora, platyhelminthes, rotifera, annelida. Fluid compression is negligible, while the tissue surrounding the organs of these animals will compress.
However, sponges exhibit a range of diversity in body forms, including variations in the size. Porifera are most commonly asymmetrical but can also have radial symmetry. Pdf the porifera are a wellcharacterised group of aquatic, predominantly marine animals including about 5000 described species. The phylum porifera contains animals known as sponges. However, sponges exhibit a range of diversity in body forms, including variations in the size of the spongocoel, the number of osculi, and where the cells that filter food from the. Pdf on apr 8, 2019, thomas jankowski and others published phylum cnidaria find, read and cite all the research you need on researchgate. D the body encloses a single cavity the coeienteron. They have a complete digestive tract and move rapidly by use of cilia. Body wall epidermis from ectoderm ecto outside lining of gastrovascular cavity from endoderm endo inside radial vs bilateral symmetry polyp and medusa forms medusas polyps phylum cnidaria. Large dorsal hole where water leaves the sponge s central cavity 3. Water is drawn through the pores into a central cavity. Porifera have no real body layers but they do have 2 cell layers.
List, cite an example of, and identify the major characteristics of each of the three classes of the phylum platyhelminthes. Porifera authors touiek samaai 1, robyn payne2, seshnee maduray, and liesl janson citation samaai t, payne rp, maduray s and janson l. But the cells have differentiated to result in a division of labor such as reproduction, feeding, and water circulation. The simplest of all the invertebrates are the parazoans, which include only the phylum porifera. They possess cells called cnidoblasts for defence and food. Although sponges are multicellular, the cell aggregates of this phylum do not form true tissues. Atkinson lj and sink kj eds field guide to the ofshore marine invertebrates of south africa, malachite marketing and media, pretoria, pp. The pores are tiny, but the vent can be easily seen in a living sponge.
The coelom or celom is the main body cavity in most animals and is positioned inside the body to surround and contain the digestive tract and other organs. Obelia polyp colony feeding polyp, medusa polyp, medusa 4. General characteristic features of phylum porifera online. In the past, and for practical purposes, coelom characteristics have been used to classify bilaterian animal phyla into informal. Modern day sponges phylum porifera represent the descendants of the most ancient animals. Water exits these canals through an opening called the prosopyle. Water can enter into the spongocoel from numerous pores in the body wall. These are primitive multicellular animals and have cellular level of organisation. In other animals, such as molluscs, it remains undifferentiated. Collar cells that line the body cavity and have flagella that circulate water in sponges. Phylum porifera mcq with detailed explanation for interview, entrance and competitive exams. The whole body consists of a group of well differentiated cells.
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