S.N Unicellular organisms Multicellular organisms 1. Made up of single cell. Made up of several cells. 2. There is no division of labour. There is division of labour. 3. Comparatively larger in size. Smaller in size. 4. Unable to exhibit wide range of different functions. More efficient and carries out a number of activities. 5. … Read more
multicellular, triploblastic, system grade of body organization. mostly bilaterally symmetrical except gastropods. mostly marine, some are found in fresh water whereas some are terrestrial. body is soft and unsegmented. body is divided into head, foot and visceral mass. body enclosed in shell formed of calcium carbonate. shell may be external, internal, reduced or absent. locomotion … Read more
exclusively marine. multicellular, system grade of body organization. triploblastic, coelomate and radially symmetrical. free living, free swimming or sedentary. star shaped, oval shaped, globular, or discoidal with distinct oral or aboral surface. literally means spiny skinned animals. body surface is marked by five distinct ambulacral grooves and alternating five interambulacral area. water vascular system, consists … Read more
largest phylum of animal kingdom. found in every possible habitat of earth. multicellular, triploblastic, bilaterally symmetrical, metamerically segmented, system grade of body organization. jointed appendages for locomotion, food collection and sensory purposes. body externally covered by hard chitinous cuticle. body divided into head, thorax and abdomen. In some head and thorax fused to form cephalothorax. … Read more
multicellular, triploblastic, bilaterally symmetrical with system grade of body organization. mostly aquatic, found in sea water or fresh water, some are terrestrial and burrowing, few are ecto-parasitic. body is elongated, cylindrical and metamerically segmented (body divided into many similar segments). body is covered by non-chitinous cuticle secreted by ectoderm. complete and straight alimentary canal. coelomate. … Read more
multicellular, triploblastic, bilaterally symmetrical with system grade of body organization. tube within tube body plan. mostly parasitic, few are free living found in sea water, fresh water or damp soil. body is elongated, cylindrical, unsegmented without lateral appendages. body is covered by cuticle, formed by syncytial epidermis. body cavity is pseudocoel. Thus, they are pseudocoelomate. … Read more
multicellular, triploblastic, bilaterally symmetrical. first animals to have organ-system grade of body organization. body is dorsoventrally flattened so called flat worms. size varies from less than mm and more than 10-15 metres. mostly parasitic, few are free living and are found in water or damp soil. parasitic forms have hooks and suckers to stick to … Read more
multicellular with tissue grade of body organization. aquatic, mostly marine, few are found in fresh water. sedentary or free swimming. mostly radially symmetrical whereas few are asymmetrical. diploblastic i.e. outer layer is called ectoderm and inner layer is called endoderm. There is a jelly like layer present in between these 2 layers called mesogloea. … Read more
Multicellular, eukaryotic with cellular grade of body organization. Aquatic, mostly marine few found in fresh water. Solitary or colonial, free living. Sedentary and sessile. May be asymmetrical (Spongilla) or radially symmetrical (Leucosolenia). Body greatly varies in shape. They may be vase-like, cylindrical, tubular or cushion like. Body is provided with large number of small inhalant … Read more
The characteristics of this phylum are as follows: Presence of notochord Presence of dorsal hollow (tubular) nerve cord. Presence of pharyngeal gill slits. Post anal tail is present. Image source: kullabs This phylum is classified into four sub-phylum. They are as follows: Sub- phylum 1: Hemichordata Marine animals. Simple worm-like soft bodied animal. Remain buried … Read more