The gastro-vascular cavity in coelenterates acts as digestive as well as the body cavity. Answer (4) Poriferans are sessile organisms and remain attached to substratum. Flatworms have a well-developed nervous system however; respiratory and circulatory systems are absent. ), which form only two embryonic tissue layers (diploblastic development). It is hollow and its wall is supported with a skeleton of spicules , fibres or of both and contains many pores … They all are considered to be a part of this non – chordates group. 1. The general characteristic features of Non-Chordates are : They are cylindrical, triploblastic, coelomate, or pseudocoelomate animals. Ltd.-Regd. 52-90 4 Phylum Coelentrata: General Characters, Classification up to order. Non Chordates are classified further into phyla: Porifera – Sponges belong to this group. The pores and channels allow the circulation of water. This class of animals is the only one who nourish the off springs with milk and the world has got almost 4, 000 species of mammal altogether. Non-chordates includes the phyla like Porifera, Coelenterata (Cnidaria), Ctenophora, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata. Answer: Amphioxus. Non – Chordates and Chordates. Office: Aakash Tower, Plot No.-4, Sector-11, Dwarka, New Delhi-75 Ph.011-47623456 6. 4.2.1 Phylum – Porifera Members of this phylum … Non chordate animals belongs to porifera, Coelenterates, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca,echinodermata and hemichordata. The invertebrates, or invertebrata, are animals that do not contain bony structures, such as the cranium and vertebrae.The simplest of all the invertebrates are the Parazoans, which include only the phylum Porifera: the sponges (Figure 1).Parazoans (“beside animals”) do not display tissue-level organization, although they do have specialized cells that perform specific functions. There are approximately 5000 species in a phylum Porifera. All members of Porifera range in size from a few millimeters wide to more than one meter tall. They have an organ level of organization. Therefore, non-chordates do not possess a vertebral column and are termed as invertebrates. These are generally … b. Porifera to annelids. Ascaris has all of the following … Sexual species are termed as hermaphrodite i.e. Squamata (9, 150 species of worm lizards snakes and lizards). Reproduction occurs by both sexual and asexual means. Chordates have a prominent notochord, whereas non chordates do not have a notochord. Non-chordates are animals lacking a Notochord. 1. They have a close relationship to chordates and that’s why they are called pre-chordates. Comparison Chart: Chordates vs Non-Chordates . The members of this phylum are parasites and cause diseases in humans and plants. Vertebrates are generally classified broadly into 7 different parts. The only phylum bearing pseudocoelom is (1) Annelida (2) Porifera (3) ... Nervecord is part of nervous system, mesodermal in origin and is found in both chordates and non-chordates. Chordates show four features, at different stages in their life. There has been some debate about whether the phylum Porifera are truly a monophyletic group. MCQ Biology - Learning Biology through MCQs . c) Fertilization takes place in an eternal manner, where as some species are found to have internal fertilization. The digestive system has an alimentary canal with two openings i.e. They have the characteristic notochord, dorsal nerve … These animals are without a backbone. This phylum is probably the most notable phylum, as all human beingsand other animals and birds that are known to you, fall under this phylum. the ectoderm and the endoderm. Platyhelminthes. Ellias placed sponges among animals. In terms of the vertebrates, the entire notochord or a part of it is replaced by the hard bones. 1.2-Introduction Their body wall is made of unicellular epidermis with mucus-secreting cells. Arthropoda. Without three embryonic tissue layers to form a foundation for later development, the sponges and cnidarians are … Echinoderms are triploblastic coelomates and possess radial symmetry. They are aquatic, mostly marine, asymmetrical and a few species live in freshwaters. The phylum chordata is a very diverse phylum which … • Study of Paramecium with particular reference to locomotion, Osmoregulation and reproduction. They reproduce predominantly by asexual means (budding) however sexual reproduction is also observed in some coelenterates. The acoelomate phyla are Placozoa , Porifera , Cnidaria , Ctenophora , Platyhelminthes, Mesozoa, Nemertina, Gnathostomulida. Chordates are coelomate and show an organ system level of organisation. This phylum consists of a small group of worm-like, marine species with an organ-system level of organization. They share many similarities and dissimilarities with chordates. Non-chordates are animals lacking a Notochord. They are macroscopic and can be seen with a naked eye. The key difference between Porifera and Coelenterata is that Porifera … 3 Phylum Porifera: General Characters, Classification up to order.Sycon with Special reference to structure, Reproduction and development. 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