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NEET Animal Kingdom: 5 practice MCQs with answers

By the PrepMatic team · Updated 9 Oct 2026 · 3 min read

Animal Kingdom is a Class 11 Biology chapter that classifies animals phylum by phylum, from Porifera to Chordata. NEET questions are direct: which phylum has which feature, an example of a class, or an exception. The five MCQs below cover cnidoblasts, the water vascular system, the largest phylum, urochordates and the heart of reptiles.

What this chapter covers in the NEET syllabus

Animal Kingdom is part of the NMC unit Diversity in Living World, and it is a Class 11 NCERT chapter. The topics are:

• Basis of classification: levels of organisation, symmetry, germ layers, coelom, segmentation, and the notochord.
• The non-chordate phyla: Porifera, Cnidaria, Ctenophora, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata and Hemichordata.
• Phylum Chordata: Urochordata, Cephalochordata and Vertebrata.
• The vertebrate classes: cyclostomes, fishes, amphibians, reptiles, birds and mammals.

Five practice MCQs on the Animal Kingdom

Question 1

Cnidoblasts, or stinging cells, are a characteristic feature of the phylum:

• A. Porifera
• B. Cnidaria
• C. Platyhelminthes
• D. Annelida

Question 2

A water vascular system is found in members of the phylum:

• A. Mollusca
• B. Arthropoda
• C. Echinodermata
• D. Annelida

Question 3

The largest phylum of the animal kingdom is:

• A. Arthropoda
• B. Mollusca
• C. Chordata
• D. Annelida

Question 4

In urochordates (tunicates), the notochord is present:

• A. only in the adult head region
• B. throughout life
• C. only in the adult tail
• D. only in the larval tail

Question 5

Among reptiles, a four-chambered heart is found in:

• A. lizards
• B. snakes
• C. crocodiles
• D. turtles

Answers and explanations

1. B. Cnidarians (jellyfish, sea anemones, corals, Hydra) have cnidoblasts or cnidocytes containing stinging capsules called nematocysts, used for anchorage, defence and capturing prey.
2. C. Echinoderms such as starfish and sea urchins have a water vascular system of canals that helps in locomotion, capturing food and respiration. They also show radial symmetry as adults and have an endoskeleton of calcareous ossicles.
3. A. Arthropoda, with insects as the largest class, is the largest phylum of animals. Its members have jointed appendages and a chitinous exoskeleton. Chordata is the most familiar phylum but it is smaller.
4. D. In urochordates the notochord is present only in the larval tail. In cephalochordates it extends from head to tail and persists throughout life. In vertebrates it is replaced by the vertebral column in the adult.
5. C. Reptiles usually have a three-chambered heart with two atria and a single ventricle. The crocodile is the exception, with a four-chambered heart. Birds and mammals also have four-chambered hearts.

How to prepare the Animal Kingdom

• Study with a phylum table. For each phylum note symmetry, body cavity, germ layers, segmentation, digestive system, special feature and two or three examples. A single sheet can hold the full classification.
• Learn the exceptions. The crocodile's four-chambered heart, egg-laying mammals such as the platypus, flightless birds such as the ostrich, and animals whose names mislead, such as jellyfish and starfish, which are not fishes. Exceptions make good MCQs.
• Use special terms with their phyla. Choanocytes (sponges), nematocysts (Cnidaria), comb plates (Ctenophora), flame cells (Platyhelminthes), radula (Mollusca), Malpighian tubules (insects), tube feet (Echinoderms).
• Memorise correct names of examples. Many options are common names versus scientific names. Practise the animals NCERT lists for each class.
• Review characters of chordates and non-chordates in a short comparison.

Learning by phylum, then by exceptions, takes about three sessions. The broader approach for Biology is in the NEET Biology preparation guide, and the list of units in the NEET syllabus.

Take a full Animal Kingdom test on PrepMatic

After you know your phylum table by heart, check recall with a PrepMatic topic test: about 15 questions in 30 minutes, scored with NEET's negative marking. The free Basic plan includes topic tests, and the practice hub lists related Biology chapters.

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