Class 11 Biology | Animal Kingdom - V

Welcome to Nectar Education! 🪸 In this video (Page 19 of Chapter 4 – The Animal Kingdom), we explore Phylum Coelenterata (Cnidaria) — the first group of animals to show tissue-level organization and radial symmetry. Understand their body structure, life cycle, and examples in a crisp and clear way, based on Nectar’s Class 11 Biology Book & NCERT Biology, ideal for NEET 2025 and CBSE Class 11 students. 📚 Topics Covered (Page 19): 🌊 1️⃣ Introduction to Coelenterata (Cnidaria): Derived from Greek coelenteron = hollow cavity. Aquatic, mostly marine; some live in colonies (e.g. Corals). Show tissue-level organization and radial symmetry. Body wall has two layers – ectoderm and endoderm → diploblastic. 🧬 2️⃣ General Characteristics: Body Structure: Cylindrical or umbrella-shaped with central gastrovascular cavity (coelenteron). Single Opening: Mouth serves for both ingestion and egestion. Tentacles: Surround the mouth; contain cnidoblasts (stinging cells) for defense and capturing prey. Forms: Polyp: Cylindrical, sessile (e.g. Hydra). Medusa: Umbrella-shaped, free-swimming (e.g. Aurelia). Reproduction: Asexual by budding (common in polyps). Sexual reproduction involves alternation of generations (Metagenesis). 💡 Highlights: First appearance of tissues in animal evolution Explains metagenesis and cnidoblasts clearly Based on Nectar Education’s Class 11 Biology Book & NCERT Biology 🔗 Explore More: 🌐 Visit – https://www.nectaredu.com/ 🛒 Access Full Notes & NEET Study Material – https://nectaredu.in/ 📺 Previous Video: Phylum Porifera – General Characters & Examples (Page 18) #Coelenterata #Cnidaria #AnimalKingdom #Hydra #Aurelia #Obelia #Coral #NEET2025 #CBSEBiology #Class11Biology #NectarEducation #StudyWithNectar #BiologyMadeEasy #NCERTBiology #Metagenesis #Cnidoblasts #DiploblasticAnimals #RadialSymmetry