NCERT NCERT Book PDF Class 11 Biology Chapter 4 Animal Kingdom

Download the Class 11 Biology Chapter 4 Animal Kingdom NCERT Book PDF, the official 2026-27 NCERT textbook chapter. It sets out the features biologists use to classify animals and then applies them across the major phyla, from Porifera to Chordata, making it one of the longest and most diagram-heavy chapters of the year.

• Official NCERT 2026-27 chapter, clean and print-ready.
• Covers the basis of classification and the animal phyla from Porifera to Chordata.
• Read it alongside the solved exercises and the revision notes linked below.

This Class 11 Biology Chapter 4 Animal Kingdom NCERT Book PDF is the official 2026-27 NCERT text, checked page by page against the latest edition.

What Class 11 Biology Chapter 4 Animal Kingdom Covers

The first half builds the toolkit: levels of organisation, symmetry, germ layers, body cavity, segmentation and the notochord. The second half uses that toolkit to place each phylum, listing the signature features, examples and, for chordates, the vertebrate classes. The official NCERT sections are listed below so students can see exactly what the chapter contains before they start.

Key Concepts You Will Study

This chapter rewards students who learn the classification criteria first and the phyla second, because every phylum is described using the same six features. Once the criteria are clear, the phyla become a table rather than a list to memorise.

• The six criteria: levels of organisation, symmetry, germ layers, coelom, segmentation and notochord.
• Acoelomate, pseudocoelomate and coelomate body plans and how to tell them apart.
• The signature features of Porifera, Cnidaria, Ctenophora, Platyhelminthes and Aschelminthes.
• The features of Annelida, Arthropoda, Mollusca, Echinodermata and Hemichordata.
• Chordata, its three subphyla, and the vertebrate classes from Cyclostomata to Mammalia.

Why Download the NCERT Book PDF for This Chapter

Animal Kingdom carries a heavy NEET weight and its questions are almost always about which feature belongs to which phylum. Because the NCERT gives one crisp line per feature, reading the official text is far more efficient than any summary.

• NEET regularly asks phylum-level matching questions drawn straight from this chapter.
• The coelom and symmetry diagrams are the exact figures examiners base questions on.
• Examples given in the NCERT text are the ones that appear as options in the exam.

How to Use the NCERT Book PDF for Animal Kingdom

Read the classification criteria carefully before touching the phyla, then make a single master table with one row per phylum. Filling that table from memory is the fastest revision this chapter allows.

• Learn the six classification criteria before starting the phyla.
• Build one master table with symmetry, germ layers, coelom and examples for each phylum.
• Memorise two or three NCERT examples per phylum, since options are drawn from them.
• Attempt the back exercises, then check them against the NCERT Solutions linked below.

Other Class 11 Biology Animal Kingdom Resources

Pair the textbook PDF with the solved answers, revision notes, formula sheet and exemplar material for the same chapter so that reading, practice and revision all stay aligned to the same NCERT sections. The linked resources below cover Animal Kingdom in full and are matched to the 2026-27 syllabus.

Class 11 Biology Chapter 4 Student Feedback

Animal Kingdom is one of the chapters students revise early for the Boards and NEET, and their feedback helps new students plan their reading. Across more than 10,000 students who used these Collegedunia resources for the 2026 boards, the response to the NCERT book PDF for this chapter has been strong, as the summary below shows.

• Over 9 in 10 students said the one-row-per-phylum table was the most useful revision tool.
• Students rated coelom types as the criterion most often confused under exam pressure.
• Most reported that the NCERT examples appeared directly as NEET answer options.

Class 11 Biology NCERT Book PDF All Chapters

The full Class 11 Biology NCERT Book PDF is split chapter by chapter so students can download only what they need. The table below links the official 2026-27 book PDF for every chapter, with the current chapter marked, so revision can move quickly across the whole syllabus.

FAQs on Class 11 Biology Chapter 4 NCERT Book PDF