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WELCOME Dr. Mohammad Nurul Hoque Head of The Department Department of Science English Version Cambrian School & College In how many classes soaps can be divided according characteristics? Toilet soap Detergent Laundry তরল সাবান Do they have same structure? Do Do they they move take in same same food? way?are there? live Do they in same look environment? alike? Do you know how many types of species Do they have backbone? Classification of Animal Kingdom Chapter: ONE Lesson: 1-3 Lesson Outcome After this lesson students will able to… Say about classification Say the characteristics of porifera Say about characteristics of cnidarian and nematode Important words 1. Classification 2. Taxonomy 3. Binomial 4. Species 5. Sponge Classification The systemic arrangement of living world into different categories according to different characteristics is called classification. Classification is the only way to know the structure and nature of such huge number of animals. Morphological characteristics of the animal, similarity and dissimilarity among them and their interrelationship are the basis of classification. Porifera General Characteristics (1) They are simplest multicellular animal. (2) Body wall with numerous pores. Through these pores food and oxygen enters into the body. (3) There is no compact tissue, organ and organ system. Examples: Spongilla, Scypha Spongilla Scypha Pores Let watch a video Cnideria General Characteristics (1) Body consists of two embryonic layers. The outer one is ectoderm and the inner one is endoderm. (2) Their body cavity is known as coelenteron. It helps in digestion and circulation. (3) Ectoderm bears a special type of cells called cnidoblast. These cells help in locomotion, defense, capture of prey etc. Example: Hydra, Obelia Hydra Obelia Let watch a video Body Structure of Hydra Platyhelminthes General characteristics (1) Body is flat, bisexual and mostly parasitic. (2) Body is covered with cuticle. (3) Body bears sucker and hooks. Example: Liver Fluke, Tape Worm Liver Fluke Cuticle Nematoda General characteristics (1) Body is tubular (cylindrical) and covered with thick skin. (2) Digestive system is complete. Mouth and anus are present. (3) Respiratory and circulatory system are absent. (4) Generally unisexual. (5) Body cavity is without lining and true coelom is absent. Example: Round worm, filaria worm. Round Worm Class Work Find out the selected MCQ’s answer from book and Mark the lines in the book Feedback 1. What is classification? 2. How many types of classifications of Animal Kingdom? 3. What is the main characteristic of porifera? Home Work Question 1: What is called binomial or scientific name? Question 2: What is the scientific name of man? Question 3: Which phylum previously known as coelenterata? Question 4: What is sponge? Question 5: Why classification is necessary? Thank You