Class 11 Biology Chapter 4 Animal Kingdom Notes for Board & NEET
Class 11 Biology – Chapter 4: Animal Kingdom Introduction Class 11 Biology Chapter 4 Animal Kingdom deals with the classification of animals based on their body structure, organization, symmetry, coelom, and evolutionary relationships. This chapter is very important for board exams as well as NEET and other competitive exams . What is Animal Kingdom? The Animal Kingdom (Animalia) includes all multicellular, eukaryotic, heterotrophic organisms that lack cell walls. Most animals show active movement , well-developed nervous coordination , and complex organ systems. Basis of Classification of Animals Animals are classified on the following bases: Level of organization – Cellular, tissue, organ, organ system Body symmetry – Asymmetrical, radial, bilateral Germ layers – Diploblastic, triploblastic Body cavity (Coelom) – Acoelomate, pseudocoelomate, coelomate Segmentation – Metameric or non-metameric Presence or absence of notochord Major Phyla of Animal Kingdom 1. Porifera Porifer...