Chapter 4: Animal Kingdom – Very Short Answer Type Questions

CBSE Class 11 Biology Very Short Answer 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 – Class 11 (School & Annual Examinations)

CBSE Class 11 Biology Chapter 4 Animal Kingdom – 50 Very Short Answer Questions (NCERT)

Section A: Basis of Classification (Q1–Q8)

1. What is the basis of classification in Animal Kingdom?
   Animals are classified based on levels of organisation, symmetry, germ layers, body cavity, segmentation, and presence or absence of notochord.
2. What is cellular level of organisation?
   It is the simplest organisation where cells are loosely arranged without tissue formation, seen in sponges.
3. Define bilateral symmetry.
   In bilateral symmetry, the body can be divided into two equal left and right halves along one plane.
4. What are diploblastic animals?
   Diploblastic animals develop from two germ layers—ectoderm and endoderm.
5. What is a true coelom?
   A true coelom is a body cavity completely lined by mesoderm.
6. Name animals with pseudocoelom.
   Aschelminthes possess pseudocoelom.
7. What is metameric segmentation?
   It is the repetition of body segments externally and internally, as seen in annelids.
8. What is the significance of notochord?
   Presence of notochord distinguishes chordates from non-chordates.

Section B: Non-Chordates – Porifera to Platyhelminthes (Q9–Q18)

9. Name the simplest multicellular animals.
   Sponges belonging to phylum Porifera are the simplest multicellular animals.
10. What is the body organisation in Porifera?
    Porifera show cellular level of organisation.
11. What are ostia?
    Ostia are minute pores present on the body wall of sponges for water entry.
12. Name the skeleton elements of sponges.
    Spicules or spongin fibres form the skeleton of sponges.
13. Which phylum shows tissue level organisation?
    Cnidaria show tissue level of organisation.
14. What are cnidocytes?
    Cnidocytes are stinging cells used for defence and capturing prey in cnidarians.
15. What are the two body forms in Cnidaria?
    Polyp and medusa are the two body forms in cnidarians.
16. Which phylum shows bioluminescence?
    Ctenophora shows bioluminescence.
17. What is the body symmetry of ctenophores?
    Ctenophores exhibit biradial symmetry.
18. Which phylum includes flatworms?
    Platyhelminthes include flatworms.

Section C: Platyhelminthes to Annelida (Q19–Q28)

19. What is the body cavity condition in Platyhelminthes?
    Platyhelminthes are acoelomate animals.
20. Name one parasitic flatworm.
    Taenia is a parasitic flatworm.
21. Which phylum shows pseudocoelom?
    Aschelminthes show pseudocoelom.
22. What is the body shape of nematodes?
    Nematodes have a cylindrical and elongated body.
23. Name one disease caused by Aschelminthes.
    Filariasis is caused by Wuchereria.
24. Which phylum shows true coelom first?
    Annelida show true coelom for the first time.
25. What type of circulatory system is present in annelids?
    Annelids possess a closed circulatory system.
26. Give one example of annelid.
    Earthworm is an example of annelid.
27. What is the level of organisation in annelids?
    Annelids show organ-system level organisation.
28. Which feature distinguishes annelids from flatworms?
    Presence of true coelom and segmentation.

Section D: Arthropoda to Echinodermata (Q29–Q38)

29. Which is the largest phylum of Animal Kingdom?
    Arthropoda is the largest phylum.
30. Name the characteristic feature of arthropods.
    Jointed appendages are characteristic of arthropods.
31. What type of skeleton is present in arthropods?
    Arthropods have a chitinous exoskeleton.
32. What type of circulatory system do arthropods have?
    Arthropods possess an open circulatory system.
33. Give one example of arthropod.
    Cockroach is an example of arthropod.
34. What is the body division in molluscs?
    Body is divided into head, muscular foot, and visceral mass.
35. Which phylum has a mantle?
    Mollusca possess a mantle.
36. Name one mollusc.
    Pila is an example of mollusc.
37. Which phylum shows water vascular system?
    Echinodermata show water vascular system.
38. What type of symmetry is seen in adult echinoderms?
    Adult echinoderms show radial symmetry.

Section E: Hemichordata & Chordates (Q39–Q44)

39. Name the connecting link between non-chordates and chordates.
    Hemichordata act as a connecting link.
40. What are the body parts of hemichordates?
    Proboscis, collar, and trunk.
41. Name one example of hemichordate.
    Balanoglossus is an example of hemichordate.
42. What is the defining feature of chordates?
    Presence of notochord at some stage of life.
43. What type of nerve cord is present in chordates?
    Chordates have a dorsal hollow nerve cord.
44. Name the two subgroups of protochordates.
    Urochordata and Cephalochordata.

Section F: Vertebrates (Q45–Q50)

45. Which animals belong to subphylum Vertebrata?
    Animals with vertebral column belong to Vertebrata.
46. Name the jawless vertebrates.
    Cyclostomata are jawless vertebrates.
47. What is the respiratory organ in fishes?
    Gills are the respiratory organs in fishes.
48. Why are amphibians called dual life animals?
    They live both on land and in water.
49. Which class has feathers?
    Aves have feathers.
50. Name one characteristic feature of mammals.
    Presence of mammary glands is a characteristic feature of mammals.

Exam Relevance

✔ Strictly NCERT-aligned
✔ Ideal for 1-mark CBSE Class 11 questions
✔ Covers complete Animal Kingdom classification
✔ Useful for quick revision and last-minute preparation