Phylum Coelenterata (Cnidaria): Examples: Physalia, Obelia, Meandrina, Adamsia, Aurelia, Gorgonia, Pennatula, Hydra

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Phylum Coelenterata (Cnidaria): Examples: Physalia, Obelia, Meandrina, Adamsia, Aurelia, Gorgonia, Pennatula, Hydra

Step 1: Visit https://vdnt.in/YTLIVE & Step 2: Select your grade & target tap on “Learn for FREE” exam to discover all our premium courses. Step 3: Click on Enroll. YOU ARE IN! We have facilitated this service for students of Grades 1 - 12 covering all major subjects*. INVITE YOUR FRIENDS & Experience the New-Age of Learning from the Safety of your Home Visit https://vdnt.in/COVID for MORE Vedantu NEET 2022 Program - F E A T U R E S - ➔ 4000+ hours of LIVE online teaching Boost your ➔ 40+ Teachers; from Top IITs and 10+ years experience learning with ➔ 750 Tests & 3000 Assignments for Practical Application ➔ Instant Doubt Solving By Academic Mentors Vedantu Pro ➔ Replay/Recording of Classes If You’ve Missed vdnt.in/YTNEET22 ➔ Rank Booster Quizzes Enroll for FREE ➔ Previous Paper Analysis ANIMAL KINGDOM-COELENTERATA Characteristics of Coelenterata ✓ Tissue grade of body organization, radial or biradial symmetry, diploblastic organisms. ✓ Habit: Majority are marine, a few freshwater forms. ANIMAL KINGDOM-COELENTERATA Characteristics of Coelenterata Body Cavity: ✓ Large body cavity/ gastrovascular cavity/ coelenteron. ✓ Nervous system: Nerve net. ✓ Digestion: Extra and Intracellular. ✓ Only one opening in body—the mouth, surrounded by a ring of tentacles. ANIMAL KINGDOM-COELENTERATA Characteristics of Coelenterata ✓ Stinging cells/Nematocysts/Cnidoblasts present in ectoderm help in capturing prey. ✓ Respiration: Excretion through general surface of body. ANIMAL KINGDOM-COELENTERATA Characteristics of Coelenterata Reproduction: ✓ Both Asexual and Sexual ✓ Fertilization external, Development is indirect. Alternation of generation/metagenesis: ✓ Alternate between Polyp and Medusa ANIMAL KINGDOM-COELENTERATA Characteristics of Coelenterata Polymorphism: ✓ Occurrence of two or more types of individual in a single species during life cycle. ✓ Polyp: Sessile, cylindrical body, asexual zooid ✓ Medusa: Free swimming, umbrella shaped, sexual zooid CLASSES OF COELENTERATA Hydrozoa Scyphozoa Anthozoa Example: Hydra, Obelia Example:Aurelia Example: Metridium, Physalia Alcyonium Phylum Coelenterata (Cnidaria): Examples: Physalia, Obelia, Meandrina, Adamsia, Aurelia, Gorgonia, Pennatula, Hydra. Physics Objective exams Mein Adam Aur George Ne Pen Hide kiya. Gorgonia (Sea-fan) Adamsia (Sea anemone) Obelia Meandrina (Brain coral) Pennatula (Sea-pen) Physalia (Portuguese Hydra. man-of-war) Aurelia or jellyfish. ANIMAL KINGDOM-CTENOPHORA Characteristics of Ctenophora ✓ Also called walnut or comb jellies ✓ Tissue grade of body organization, radial symmetry, diploblastic organisms. ✓ Habit: Marine, solitary and pelagic. ✓ Digestion is both extracellular and intracellular ANIMAL KINGDOM-CTENOPHORA Characteristics of Ctenophora ✓ Tentacles may be present or absent. ✓ When present, the number of tentacles are 2 ✓ There are eight median comb plates forming locomotor organs, covered by cilia ANIMAL KINGDOM-CTENOPHORA Characteristics of Ctenophora ✓ Sexes are not separate. Reproduction takes place only by sexual means. ✓ Fertilisation is external with indirect development. ✓ Example: Ctenoplana, Pleurobrachia, Cestum, Hormiphora Phylum – Ctenophora (sea walnuts or comb jellies) Examples: Pleurobrachia, Ctenoplana. Mnemonic:Priyanka Chopra Pleurobrachia Ctenoplana. 6% 4% 14% 9% 5% 9% 18% 6% 9% 20% .

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