Class 11 Biology | Animal Kingdom - VI

In this video (Page 20 of Chapter 4 – The Animal Kingdom), we explore the Phylum Ctenophora — commonly known as comb jellies or sea walnuts. Understand their structure, symmetry, reproduction, and unique features like bioluminescence, based on Nectar’s Class 11 Biology Book & NCERT Biology, perfect for NEET 2025 and CBSE Class 11 Biology. 📚 Topics Covered (Page 20): 🌈 1️⃣ Introduction to Phylum Ctenophora: Marine, exclusively free-swimming organisms. Commonly called sea walnuts or comb jellies. Show tissue-level organization and radial symmetry. Body is transparent, gelatinous, and bioluminescent. 🧬 2️⃣ General Characteristics: Body Wall: Diploblastic, with outer ectoderm and inner endoderm. Locomotion: By eight external rows of ciliated comb plates, a unique feature. Digestive System: Complete with a mouth and two anal pores. Reproduction: Sexes are not separate (hermaphrodite). Reproduction is sexual, with external fertilization. Development is indirect, with a cydippid larva. Special Feature: Bioluminescence — the ability to emit light, used for defense or attraction. 🪸 3️⃣ Examples of Ctenophora: Pleurobrachia (Sea Walnut) Ctenoplana 💡 Highlights: Only phylum with comb plates for movement Known for bioluminescence Key topic for NEET & NCERT-based questions Based on Nectar’s Class 11 Biology Book & NCERT Biology 🔗 Explore More: 🌐 Visit – https://www.nectaredu.com/ 🛒 Access NEET Notes & Study Material – https://nectaredu.in/ 📺 Previous Video: Phylum Coelenterata (Cnidaria) – General Characters & Examples (Page 19) #Ctenophora #AnimalKingdom #CombJellies #SeaWalnut #Pleurobrachia #Ctenoplana #Bioluminescence #NEET2025 #CBSEBiology #Class11Biology #NectarEducation #StudyWithNectar #BiologyMadeEasy #NCERTBiology #TissueLevelOrganization #DiploblasticAnimals