Last Updated: 11 May 2026
NEET-UG 2027 Biology dedicates 3-4 questions to Animal Kingdom (Class 11 Ch.4), making it a high-yield, low-effort chapter. NCERT Table 4.1 alone has driven 12 NEET questions in the last 6 years.
Basis of Classification
- Levels of organisation — Cellular (sponges), Tissue (cnidarians), Organ (flatworms), Organ-System (annelids onwards).
- Symmetry — Asymmetrical, Radial, Bilateral.
- Diploblastic vs Triploblastic.
- Coelom — Acoelomate (flatworms), Pseudocoelomate (Aschelminthes), Coelomate (annelids onwards).
- Segmentation — Metameric segmentation in annelids, arthropods, chordates.
- Notochord — Chordata vs Non-chordata.
Phyla Quick Reference
| Phylum | Examples | Key Feature |
|---|---|---|
| Porifera | Sycon, Spongilla, Euspongia | Pore-bearing; choanocytes; spicules |
| Coelenterata (Cnidaria) | Hydra, Aurelia, Adamsia | Cnidoblasts; polyp-medusa |
| Ctenophora | Pleurobrachia, Ctenoplana | Comb plates; bioluminescence |
| Platyhelminthes | Planaria, Liver fluke, Taenia | Flatworms; flame cells |
| Aschelminthes | Ascaris, Wuchereria, Ancylostoma | Roundworms; pseudocoelom |
| Annelida | Earthworm, Leech, Nereis | Metameric segmentation; nephridia |
| Arthropoda | Apis, Bombyx, Locusta, Limulus | Jointed appendages; exoskeleton |
| Mollusca | Pila, Octopus, Sepia, Loligo | Mantle; radula; muscular foot |
| Echinodermata | Asterias, Echinus, Antedon | Water vascular system; tube feet |
| Hemichordata | Balanoglossus, Saccoglossus | Stomochord; proboscis |
| Chordata | Vertebrates + Protochordates | Notochord; dorsal nerve cord; pharyngeal slits |
Classes of Vertebrata
| Class | Example | Heart | Body Cover |
|---|---|---|---|
| Cyclostomata | Petromyzon | 2-chambered | No scales |
| Chondrichthyes | Shark, Torpedo | 2-chambered | Placoid scales |
| Osteichthyes | Rohu, Hippocampus | 2-chambered | Cycloid/Ctenoid |
| Amphibia | Frog, Salamandra | 3-chambered | Moist skin |
| Reptilia | Snake, Turtle | 3 (4 in croc) | Dry scales |
| Aves | Pigeon, Penguin | 4-chambered | Feathers |
| Mammalia | Man, Whale, Bat | 4-chambered | Hair; mammary glands |
Common NCERT Mnemonics
- ‘Please Come To Play And Make Easy Hand-Crafted CC’ — Porifera, Coelenterata, Ctenophora, Platyhelminthes, Aschelminthes, Mollusca, Echinodermata, Hemichordata, Chordata.
- ‘Common Course of Operating Animals on Reasonable Average Mode’ — Cyclo, Chondri, Osteich, Amphi, Rept, Aves, Mammalia.
NEET 2026 Snapshot (4 questions from this chapter)
- Q on cnidoblasts in Hydra
- Q on water vascular system phylum
- Q on notochord-bearing protochordate
- Q on classification of Limulus (Arthropoda — Merostomata)
Internal Links
FAQ
How many marks from Animal Kingdom in NEET 2026?
Average 3-4 questions worth 12-16 marks.
Are diagrams asked?
Yes — Hydra structure, earthworm anatomy, frog heart. Memorise NCERT diagrams.
Which phylum has the highest weightage?
Arthropoda (largest phylum) — 25-30% of Animal Kingdom Qs over last decade.
Practice Quiz
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