Animal KingdomNEET MCQs with solutions
Animal Kingdom classifies animals by level of organisation, symmetry, germ layers and body cavity, then works through every phylum from Porifera to Chordata. It is one of the most example-heavy chapters in NEET Zoology, so knowing the hallmark feature and examples of each phylum is the key.
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Tap an option to check it. Questions from every NCERT topic in this chapter, from easy to hard.
Q1Basis of Classification
Which phylum represents the cellular level of organisation?
Not quite — the answer is C.
Porifera show cellular level organisation — cells perform division of labour but are not organised into tissues. Cnidaria are the first to show tissue-level organisation, making them the top distractor. Platyhelminthes and Annelida show organ and organ system levels respectively.
Q2Basis of Classification
Acoelomates are animals that:
Not quite — the answer is B.
Acoelomates have no body cavity at all — the space between body wall and gut is filled with mesenchyme. Option A describes pseudocoelomates. Option C describes true coelomates. Option D describes the condition in Arthropoda (open circulatory system with haemocoel).
Q3Porifera
The small pores on the body surface of sponges through which water enters are called:
Not quite — the answer is A.
Ostia (singular: ostium) are the numerous small pores on the sponge body wall through which water enters. Oscula is the plural of osculum — the single exit opening. Spiracles are respiratory openings in Arthropoda — a cross-phylum trap.
Q4Porifera
Which of the following CORRECTLY describes reproduction in Porifera?
Not quite — the answer is B.
Porifera show both asexual (budding, fragmentation, gemmule formation) and sexual reproduction. They are hermaphrodites — both eggs and sperms produced by the same individual — but cross-fertilisation occurs. Binary fission (Option D) is characteristic of unicellular organisms, not sponges.
Q5Cnidaria
The free-swimming, umbrella-shaped life form of cnidarians is called:
Not quite — the answer is C.
The medusa is the free-swimming sexual stage, as seen in Aurelia (jellyfish). Gemmule (Option B) is a reproductive structure of Porifera — a common NEET distractor used to test cross-phylum knowledge.
Q6Cnidaria
Coral reefs support extraordinarily high marine biodiversity. Which of the following correctly explains the structural basis for reef formation?
Not quite — the answer is B.
Coral polyps (Anthozoa) secrete calcareous (CaCO₃) exoskeletons; these accumulate over thousands of years forming the physical reef structure that supports diverse ecosystems. Option A is wrong — corals have no medusa stage; Option D confuses sponge spicules with coral skeleton.
Q7Ctenophora
The comb plates in Ctenophora are also called:
Not quite — the answer is A.
Comb plates are called ctenes — rows of fused cilia arranged in 8 meridional bands. Cnidoblasts belong to Cnidaria; ostia are pores in Porifera.
Q8Ctenophora
Ctenophores differ from cnidarians in which of the following features?
Not quite — the answer is C.
Ctenophores lack cnidoblasts (stinging cells) and instead use adhesive colloblasts. Both groups share radial/biradial symmetry, a gastrovascular cavity, and diploblastic organization.
Q9Platyhelminthes
Which of the following groups consists mostly of free-living members in Platyhelminthes?
Not quite — the answer is A.
Turbellaria (e.g., *Dugesia*/Planaria) are mostly free-living, aquatic flatworms. Cestoda and Trematoda are exclusively parasitic; Monogenea are ectoparasites of fish.
Q10Platyhelminthes
Which of the following CORRECTLY identifies the combination of features present in Platyhelminthes?
Not quite — the answer is C.
Platyhelminthes are triploblastic (three germ layers), acoelomate (no body cavity — space filled with mesenchyme), and show organ-level organization. Pseudocoelomate describes Nematoda; diploblastic describes Cnidaria and Ctenophora.
Q11Aschelminthes
Which of the following organisms belongs to phylum Aschelminthes?
Not quite — the answer is B.
Ascaris lumbricoides is the common intestinal roundworm — a classic Aschelminthes example. Taenia and Fasciola are Platyhelminthes; Aurelia is a Cnidarian.
Q12Aschelminthes
Which sequence correctly represents the evolutionary progression of body cavity complexity?
Not quite — the answer is B.
The correct sequence from least to most complex body cavity: acoelomate Platyhelminthes → pseudocoelomate Aschelminthes → true coelomate Annelida. This reflects increasing mesodermal organisation.
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Get RankUp on Google PlayQ13Annelida
Which type of body cavity is present in annelids?
Not quite — the answer is D.
Annelids have a true coelom formed by splitting of mesoderm (schizocoely), completely lined by coelomic epithelium. Pseudocoel lacks complete mesodermal lining. Hemocoel is the open circulatory space in arthropods. Acoelom is absent in annelids.
Q14Annelida
Nereis differs from earthworm in possessing:
Not quite — the answer is C.
Nereis (Polychaeta) bears parapodia — paired lateral appendages used for swimming and gas exchange — absent in earthworms (Oligochaeta). Both share closed circulation and nephridia. Clitellum is an earthworm feature, making it a strong distractor here.
Q15Arthropoda
The respiratory organ in Palaemon (prawn) is:
Not quite — the answer is A.
Prawns (class Crustacea) respire through gills housed in a branchial chamber beside the thorax. Tracheae and spiracles are features of Insecta; book lungs are found in Arachnida.
Q16Arthropoda
Periplaneta americana belongs to class Insecta. Which combination of features is DIAGNOSTIC of this class?
Not quite — the answer is C.
Insects (Insecta) are hexapods — three pairs of thoracic legs — and bear one pair of antennae. Two pairs of antennae is characteristic of Crustacea; book lungs and no antennae define Arachnida; seven pairs of legs is not a feature of any arthropod class.
Q17Mollusca
The calcareous shell in molluscs is secreted by which structure?
Not quite — the answer is D.
The mantle is a soft fold of skin that covers the visceral mass and secretes the calcareous (calcium carbonate) shell. The foot is locomotory; ctenidia are respiratory gills; the visceral mass contains organs but does not secrete the shell.
Q18Mollusca
The nervous system in Mollusca is best described as:
Not quite — the answer is B.
Molluscs possess paired ganglia — cerebral (head), pleural (mantle), pedal (foot), and visceral (organs) — interconnected by nerve cords. This is more advanced than the nerve net of Cnidaria but distinct from the single ventral nerve cord of Annelida. Cephalopods show the highest development with a fused brain.
Q19Echinodermata
Which animal is correctly identified as a sea urchin?
Not quite — the answer is D.
Echinus is the sea urchin (class Echinoidea). Asterias = starfish (Asteroidea); Cucumaria = sea cucumber (Holothuroidea); Ophiura = brittle star (Ophiuroidea).
Q20Echinodermata
The bipinnaria larva is associated with which echinoderm?
Not quite — the answer is B.
Bipinnaria is the free-swimming, bilaterally symmetrical larva of starfish (Asterias). Sea urchins have pluteus larva; sea cucumbers have auricularia larva — these are common NEET-level traps.
Q21Hemichordata
The digestive tract of Balanoglossus is best described as:
Not quite — the answer is C.
The alimentary canal of Balanoglossus is a straight, complete tube running from the anterior mouth to the posterior anus. It is not sac-like (no blind end), not incomplete, and not segmented — segmentation is an annelid feature.
Q22Hemichordata
Which of the following is CORRECT regarding Saccoglossus?
Not quite — the answer is B.
Saccoglossus is a valid hemichordate exemplar with proboscis-collar-trunk body division and a stomochord. The statement that it lacks stomochord is incorrect — that is the key trap in this question.
Q23Chordata
The three subphyla of phylum Chordata are:
Not quite — the answer is D.
Chordata is divided into three subphyla: Urochordata (tunicates), Cephalochordata (lancelets), and Vertebrata. Hemichordata and Echinodermata are separate phyla — they are deuterostomes but not true chordates.
Q24Vertebrata
Sebaceous glands, which secrete sebum to lubricate skin and hair, are exclusively found in:
Not quite — the answer is A.
Sebaceous glands are integumentary glands unique to mammals, associated with hair follicles. Aves have only the uropygial (preen) gland. Reptilian skin is dry and scale-covered with no functional skin glands. Amphibia have mucus and poison glands, not sebaceous glands.
ELITE question · AIR under 50 level
This chapter has 92 ELITE questions for students aiming at the very top. They are only in the app.
Unlock ELITE questions in the appPhylum hallmarks and examples
Quick revision: most questions in this chapter test these facts.
| Phylum or class | Hallmark and examples |
|---|---|
| Porifera | Cellular level; canal system with choanocytes; spicules — Sycon, Spongilla, Euspongia |
| Cnidaria | Cnidoblasts; polyp and medusa; metagenesis in Obelia — Physalia, Adamsia, Pennatula, Gorgonia, Meandrina |
| Ctenophora | Eight comb plates; bioluminescence — Pleurobrachia, Ctenoplana |
| Platyhelminthes | Dorsoventrally flat; acoelomate; flame cells — Taenia, Fasciola |
| Aschelminthes | Pseudocoelomate; sexes separate — Ascaris, Wuchereria, Ancylostoma |
| Annelida | Metameric segmentation; nephridia — Nereis, Pheretima, Hirudinaria |
| Arthropoda | Largest phylum; jointed appendages; chitinous exoskeleton; Malpighian tubules — Apis, Bombyx, Laccifer, Anopheles, Limulus (living fossil) |
| Mollusca | Second largest phylum; mantle and radula — Pila, Pinctada, Sepia, Loligo, Octopus |
| Echinodermata | Water vascular system; adults radial, larvae bilateral — Asterias, Echinus, Antedon, Cucumaria, Ophiura |
| Hemichordata | Proboscis, collar, trunk; stomochord — Balanoglossus, Saccoglossus |
| Chordata | Notochord, dorsal hollow nerve cord, pharyngeal gill slits — Urochordata (Ascidia, Salpa, Doliolum), Cephalochordata (Branchiostoma) |
| Cyclostomata | Jawless — Petromyzon, Myxine |
| Chondrichthyes | Cartilaginous endoskeleton — Scoliodon, Pristis, Trygon, Torpedo |
| Osteichthyes | Bony skeleton; air bladder — Exocoetus, Hippocampus, Labeo, Catla |
| Amphibia | Three-chambered heart — Bufo, Rana, Ichthyophis |
| Reptilia | Dry scaly skin; crocodiles have a four-chambered heart — Chelone, Testudo, Naja, Vipera |
| Aves | Pneumatic bones; crop and gizzard — Corvus, Columba, Psittacula |
| Mammalia | Mammary glands, hair — Ornithorhynchus (oviparous), Macropus, Pteropus, Balaenoptera |
What the app covers in this chapter
926 questions in total, each with a detailed explanation.
| Basis of Classification | 62 |
| Porifera | 62 |
| Cnidaria | 62 |
| Ctenophora | 40 |
| Platyhelminthes | 60 |
| Aschelminthes | 55 |
| Annelida | 55 |
| Arthropoda | 60 |
| Mollusca | 60 |
| Echinodermata | 60 |
| Hemichordata | 62 |
| Chordata | 60 |
| Vertebrata | 59 |
| Mixed practice and chapter tests | 169 |
Questions students ask
Is Animal Kingdom important for NEET?
Yes. It is one of the largest and most frequently tested Zoology chapters in Class 11. Questions test the basis of classification, the hallmark feature of each phylum and class, and the examples NCERT gives for each.
Which topics should I revise first?
Start with the basis of classification (levels of organisation, symmetry, germ layers, coelom), then use the phylum table on this page to lock in each hallmark with its examples, and finish with the vertebrate classes.
How many questions from this chapter are on RankUp?
The RankUp app has 926 questions on Animal Kingdom, including 92 ELITE questions written for students aiming at AIR under 50. Every question has a detailed explanation.
Can I download these questions as a PDF?
Yes. The free PDF on this page has all 24 questions with the answer key and explanations. No signup is needed.
