CBSE Class 11 Biology Case-Based Questions: Structural Organisation in Animals (NCERT-Based)

Course and Examination Framework

Course: CBSE Class 11 Biology

Board: Central Board of Secondary Education

Unit II: Structural Organisation in Animals and Plants

Chapter 7: Structural Organisation in Animals

Question Type: Case-Based / Source-Based Questions

Syllabus: Strictly as per NCERT

Exam Relevance: CBSE Class 11 Annual & School Examinations

Section A: Animal Tissues (Case-Based Questions 1–10)

Case 1

A tissue lines the alveoli of lungs and allows rapid exchange of gases.

Q1. Identify the tissue.
Ans: Simple squamous epithelium.

Q2. State one structural feature that helps its function.
Ans: Thin, flat cells arranged in a single layer reduce diffusion distance.

Case 2

A glandular structure secretes enzymes directly into ducts.

Q3. Name the epithelial tissue involved.
Ans: Glandular epithelium.

Q4. Why is this tissue suitable for secretion?
Ans: Cells are specialized with abundant cytoplasm and secretory granules.

Case 3

A tissue connects muscles to bones and transmits force during movement.

Q5. Identify the connective tissue.
Ans: Tendon.

Q6. Name the main fibre present in it.
Ans: Collagen fibres.

Case 4

Fat accumulation is observed beneath the skin in mammals.

Q7. Name the tissue involved.
Ans: Adipose tissue.

Q8. State two functions of this tissue.
Ans: Energy storage and thermal insulation.

Case 5

A tissue contracts rhythmically without fatigue throughout life.

Q9. Identify the tissue.
Ans: Cardiac muscle tissue.

Q10. Mention one unique structural feature.
Ans: Presence of intercalated discs.

Section B: Earthworm – Morphology and Anatomy (Case-Based Questions 11–15)

Case 6

An organism shows repeated body segments with similar internal structures.

Q11. Name the phenomenon.
Ans: Metamerism.

Q12. State its advantage.
Ans: Provides flexibility and efficient locomotion.

Case 7

A structure secretes mucus and forms a cocoon during reproduction.

Q13. Identify the structure.
Ans: Clitellum.

Case 8

Gas exchange occurs through moist skin in a soil-dwelling organism.

Q14. Name the type of respiration.
Ans: Cutaneous respiration.

Case 9

Blood flows through vessels and contains haemoglobin dissolved in plasma.

Q15. Name the type of circulatory system.
Ans: Closed circulatory system.

Case 10

Nitrogenous wastes are removed by numerous tubular structures.

Q16. Identify these structures.
Ans: Nephridia.

Section C: Cockroach – Morphology and Anatomy (Case-Based Questions 16–20)

Case 11

An insect has a hard outer covering made of chitin.

Q17. Name this covering.
Ans: Exoskeleton.

Case 12

Oxygen reaches body tissues directly without blood involvement.

Q18. Name the respiratory system.
Ans: Tracheal system.

Case 13

A fluid circulates in body cavity but does not carry oxygen.

Q19. Identify the fluid.
Ans: Haemolymph.

Case 14

Excretory organs open into the hindgut and remove wastes from blood.

Q20. Name these organs.
Ans: Malpighian tubules.

Case 15

Segmentally arranged ganglia control movement and coordination.

Q21. Name the nervous system type.
Ans: Ventral nerve cord with segmental ganglia.

Section D: Frog – Morphology and Anatomy (Case-Based Questions 21–25)

Case 16

An animal lives both on land and in water during its life cycle.

Q22. What is such an animal called?
Ans: Amphibian.

Case 17

Respiration occurs through skin, lungs, and buccopharyngeal cavity.

Q23. Name this mode of respiration.
Ans: Dual or amphibious respiration.

Case 18

The heart has two atria and one ventricle.

Q24. Name the type of heart.
Ans: Three-chambered heart.

Case 19

Webbed feet help in propulsion in water.

Q25. State the function of this adaptation.
Ans: Efficient swimming.

Case 20

Urine and faeces are expelled through a common chamber.

Q26. Name the chamber.
Ans: Cloaca.

Learning Outcomes (CBSE Focus)

• Strengthens application-based understanding
• Enhances structure–function correlation
• Aligns with new CBSE assessment pattern
• Ideal for case-based and competency-based questions