NEET PYQs – Chapter 4: Animal Kingdom

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 Here you go – the Top 50 Most Important NEET PYQs from Chapter 4: Animal Kingdom with detailed solutions, presented in a clean, blog-style format in one full stretch. Perfect for NEET 2025 prep! 🌟

🐾 NEET PYQs – Chapter 4: Animal Kingdom

🔥 Top 50 Most Important Questions with Detailed Answers & Explanations

By @neetpyqall

1. Which one of the following is a non-chordate?

  • A) Herdmania

  • B) Amphioxus

  • C) Salpa

  • D) Sea anemone
    ✅ Answer: D) Sea anemone
    Explanation: Sea anemone belongs to phylum Cnidaria – a non-chordate. Others are urochordates or cephalochordates.

2. Which is not a feature of mammals?

  • A) Diaphragm

  • B) Pinna

  • C) Hair

  • D) Nucleated RBC
    ✅ Answer: D) Nucleated RBC
    Explanation: Mammals have non-nucleated RBCs, which increases space for oxygen-carrying hemoglobin.

3. Which phylum has a water vascular system?

  • A) Annelida

  • B) Mollusca

  • C) Echinodermata

  • D) Arthropoda
    ✅ Answer: C) Echinodermata
    Explanation: Water vascular system is unique to echinoderms, used in locomotion, feeding, and respiration.

4. Radula is a characteristic feature of:

  • A) Mollusca

  • B) Echinodermata

  • C) Annelida

  • D) Arthropoda
    ✅ Answer: A) Mollusca
    Explanation: Radula is a rasping tongue-like organ found in molluscs for feeding.

5. Which of the following are hermaphrodites?

  • A) Earthworm

  • B) Cockroach

  • C) Housefly

  • D) Mosquito
    ✅ Answer: A) Earthworm
    Explanation: Earthworms possess both male and female reproductive organs – hence, hermaphrodites.

6. Which of the following is bilaterally symmetrical?

  • A) Aurelia

  • B) Sea anemone

  • C) Earthworm

  • D) Starfish
    ✅ Answer: C) Earthworm
    Explanation: Earthworms show bilateral symmetry. Cnidarians and echinoderms are radially symmetrical.

7. Presence of a notochord is a characteristic of:

  • A) Hemichordata

  • B) Chordata

  • C) Echinodermata

  • D) Arthropoda
    ✅ Answer: B) Chordata
    Explanation: Chordates are defined by the presence of a notochord at some stage of life.

8. What is common between Aves and Mammals?

  • A) Pneumatic bones

  • B) Vivipary

  • C) Warm-blooded nature

  • D) Presence of hair
    ✅ Answer: C) Warm-blooded nature
    Explanation: Both Aves and mammals are endothermic (warm-blooded), maintaining constant internal temperature.

9. Book lungs are found in:

  • A) Cockroach

  • B) Earthworm

  • C) Spider

  • D) Fish
    ✅ Answer: C) Spider
    Explanation: Spiders have book lungs for gaseous exchange – a type of respiratory structure in arachnids.

10. Which animal is triploblastic and acoelomate?

  • A) Hydra

  • B) Planaria

  • C) Starfish

  • D) Earthworm
    ✅ Answer: B) Planaria
    Explanation: Planaria (Platyhelminthes) is triploblastic but lacks a true body cavity – hence, acoelomate.

11. The excretory structure of Annelida is:

  • A) Flame cells

  • B) Malpighian tubules

  • C) Nephridia

  • D) Green glands
    ✅ Answer: C) Nephridia
    Explanation: Nephridia are segmentally arranged excretory organs in annelids like earthworms.

12. Which of the following has a true coelom?

  • A) Ascaris

  • B) Roundworm

  • C) Earthworm

  • D) Tapeworm
    ✅ Answer: C) Earthworm
    Explanation: Earthworms (Annelida) are eucoelomates – they possess a true coelom lined by mesoderm.

13. Pseudocoelom is found in:

  • A) Flatworms

  • B) Roundworms

  • C) Annelids

  • D) Arthropods
    ✅ Answer: B) Roundworms
    Explanation: Roundworms (Aschelminthes) have a body cavity not completely lined with mesoderm – pseudocoelom.

14. Flame cells are found in:

  • A) Aschelminthes

  • B) Cnidaria

  • C) Platyhelminthes

  • D) Annelida
    ✅ Answer: C) Platyhelminthes
    Explanation: Flame cells are excretory structures in flatworms like Planaria.

15. Which of the following animals shows metamerism?

  • A) Earthworm

  • B) Tapeworm

  • C) Leech

  • D) Both A and C
    ✅ Answer: D) Both A and C
    Explanation: Metamerism (segmentation) is shown by annelids like earthworm and leech.

16. Which is not a characteristic of Phylum Arthropoda?

  • A) Jointed appendages

  • B) Open circulatory system

  • C) Metamerism

  • D) Notochord
    ✅ Answer: D) Notochord
    Explanation: Arthropods are invertebrates and lack a notochord – it's a chordate feature.

17. Which is the largest phylum of animals?

  • A) Mollusca

  • B) Arthropoda

  • C) Chordata

  • D) Annelida
    ✅ Answer: B) Arthropoda
    Explanation: Arthropoda is the largest phylum, with over 80% of all known animals.

18. Which of these is a cartilaginous fish?

  • A) Shark

  • B) Catla

  • C) Rohu

  • D) Tuna
    ✅ Answer: A) Shark
    Explanation: Sharks belong to class Chondrichthyes, with cartilaginous endoskeletons.

19. Which animal shows external fertilization?

  • A) Cow

  • B) Dog

  • C) Frog

  • D) Bird
    ✅ Answer: C) Frog
    Explanation: Frogs release gametes in water where external fertilization takes place.

20. Mammals differ from reptiles in:

  • A) External ears

  • B) Scales

  • C) Cloaca

  • D) Poikilothermy
    ✅ Answer: A) External ears
    Explanation: External ear or pinna is present in mammals but absent in reptiles.

21. Which one is a cold-blooded animal?

  • A) Cow

  • B) Dog

  • C) Lizard

  • D) Pigeon
    ✅ Answer: C) Lizard
    Explanation: Lizards (reptiles) are ectothermic, i.e., cold-blooded.

22. Which class includes animals with a 4-chambered heart and lays eggs?

  • A) Aves

  • B) Mammals

  • C) Reptiles

  • D) Amphibians
    ✅ Answer: A) Aves
    Explanation: Birds (Aves) are oviparous and have a completely four-chambered heart.

23. Notochord appears only during larval stage in:

  • A) Amphioxus

  • B) Herdmania

  • C) Balanoglossus

  • D) Shark
    ✅ Answer: B) Herdmania
    Explanation: Urochordates like Herdmania show notochord only in the tail region of the larva.

24. The characteristic feature of echinoderms is:

  • A) Parapodia

  • B) Pseudocoelom

  • C) Water vascular system

  • D) Flame cells
    ✅ Answer: C) Water vascular system
    Explanation: It’s a defining feature of echinoderms like starfish.

25. Which of the following is not a connective tissue?

  • A) Cartilage

  • B) Blood

  • C) Bone

  • D) Muscle
    ✅ Answer: D) Muscle
    Explanation: Muscle is a muscular tissue, not connective.


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