Chapter 4: Animal Kingdom – Case-Based / Source-Based Questions with Answers
CBSE Class 11 Biology Case-Based / Source-Based Questions – Chapter 4: Animal Kingdom (NCERT Based)
Course Details
Course: CBSE Class 11 Biology
Syllabus: NCERT
Unit: Unit I – Diversity in Living World
Chapter: Chapter 4 – Animal Kingdom
CBSE Board Examination: Central Board of Secondary Education (CBSE) – Class 11 (School & Annual Examinations)
CBSE Class 11 Biology Chapter 4 Animal Kingdom – Case-Based & Source-Based Questions (NCERT)
Section A: Basis of Classification (Case 1–5)
Case 1
A zoologist studies animals with cellular, tissue, and organ-system levels of organisation.
Q1. Which criterion of classification is being referred to?
Answer: Levels of organisation.
Case 2
An animal can be divided into identical left and right halves by a single plane.
Q2. Identify the type of symmetry.
Answer: Bilateral symmetry.
Case 3
An organism develops from ectoderm, mesoderm, and endoderm.
Q3. What type of animal is this?
Answer: Triploblastic animal.
Case 4
A worm-like animal has a body cavity not lined by mesoderm.
Q4. Name the type of body cavity.
Answer: Pseudocoelom.
Case 5
An animal possesses a flexible rod-like structure along its dorsal side during development.
Q5. Identify the structure.
Answer: Notochord.
Section B: Non-Chordates – Porifera to Ctenophora (Case 6–10)
Case 6
An aquatic animal has a porous body with a canal system and spicules.
Q6. Identify the phylum.
Answer: Porifera.
Case 7
An animal shows tissue-level organisation and possesses stinging cells.
Q7. Name the phylum and special cells.
Answer: Phylum Cnidaria; cnidocytes.
Case 8
An organism exists in both polyp and medusa forms.
Q8. Which phylum shows this alternation?
Answer: Cnidaria.
Case 9
A marine animal shows bioluminescence and locomotion by comb plates.
Q9. Identify the phylum.
Answer: Ctenophora.
Case 10
An animal displays biradial symmetry and is diploblastic.
Q10. Name the animal group.
Answer: Ctenophores.
Section C: Platyhelminthes to Annelida (Case 11–15)
Case 11
A dorsoventrally flattened parasite lives in the intestine of humans.
Q11. Identify the phylum.
Answer: Platyhelminthes.
Case 12
A cylindrical worm has a complete digestive system and separate sexes.
Q12. Name the phylum.
Answer: Aschelminthes (Nematoda).
Case 13
An animal shows true coelom and metameric segmentation.
Q13. Identify the phylum.
Answer: Annelida.
Case 14
A soil-dwelling organism has a closed circulatory system.
Q14. To which group does it belong?
Answer: Annelida.
Case 15
A parasite causes filariasis in humans.
Q15. Name the causative organism group.
Answer: Aschelminthes (Nematoda).
Section D: Arthropoda to Echinodermata (Case 16–20)
Case 16
An insect has jointed legs and a chitinous exoskeleton.
Q16. Identify the phylum.
Answer: Arthropoda.
Case 17
An animal has an open circulatory system and is a disease vector.
Q17. Name the phylum.
Answer: Arthropoda.
Case 18
A soft-bodied animal has a mantle and muscular foot.
Q18. Identify the phylum.
Answer: Mollusca.
Case 19
An exclusively marine animal possesses a water vascular system.
Q19. Name the phylum.
Answer: Echinodermata.
Case 20
An adult animal shows radial symmetry, but larva shows bilateral symmetry.
Q20. Identify the phylum.
Answer: Echinodermata.
Section E: Hemichordata & Chordates (Case 21–25)
Case 21
A marine organism has pharyngeal gill slits but no true notochord.
Q21. Identify the phylum.
Answer: Hemichordata.
Case 22
An animal shows dorsal hollow nerve cord and post-anal tail.
Q22. To which group does it belong?
Answer: Chordata.
Case 23
The notochord is present only in the larval stage of an organism.
Q23. Name the subphylum.
Answer: Urochordata.
Case 24
A vertebrate is jawless and has a circular sucking mouth.
Q24. Identify the class.
Answer: Cyclostomata.
Case 25
An animal has mammary glands and hair on the skin.
Q25. Identify the class.
Answer: Mammalia.
Exam Relevance
✔ Strictly NCERT-aligned
✔ Ideal for CBSE Class 11 case-based/source-based questions
✔ Covers complete Animal Kingdom classification
✔ Enhances application, reasoning, and concept clarity