CBSE Class 11 Biology MCQs with Answers & Explanations: 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: Multiple Choice Questions (MCQs)

Total Questions: 50

Syllabus: Strictly as per NCERT

Exam Relevance: CBSE Class 11 Annual & School Examinations

Section A: Animal Tissues (MCQs 1–20)

Epithelial Tissue

Q1. Which feature is characteristic of epithelial tissue?
A. Abundant intercellular matrix
B. Presence of blood vessels
C. Cells tightly packed with minimal space
D. Presence of nerve fibres

Correct Answer: C
Explanation: Epithelial tissue consists of closely packed cells with negligible intercellular space, forming protective coverings and linings.

Q2. Simple squamous epithelium is best suited for:
A. Protection
B. Secretion
C. Diffusion
D. Mechanical support

Correct Answer: C
Explanation: Its thin, flat cells reduce diffusion distance, facilitating rapid diffusion and filtration.

Q3. Cuboidal epithelium is commonly found in:
A. Alveoli
B. Kidney tubules
C. Skin
D. Blood vessels

Correct Answer: B
Explanation: Cuboidal cells with ample cytoplasm are suited for secretion and absorption in kidney tubules.

Q4. Cilia are mainly involved in:
A. Absorption
B. Protection
C. Movement of substances
D. Secretion of enzymes

Correct Answer: C
Explanation: Cilia beat rhythmically to move substances like mucus or ova along epithelial surfaces.

Q5. Stratified epithelium primarily functions in:
A. Diffusion
B. Protection
C. Secretion
D. Absorption

Correct Answer: B
Explanation: Multiple cell layers protect underlying tissues from mechanical stress and injury.

Connective Tissue

Q6. Which connective tissue acts as a packing tissue?
A. Adipose
B. Areolar
C. Bone
D. Cartilage

Correct Answer: B
Explanation: Areolar tissue fills spaces between organs and supports blood vessels and nerves.

Q7. Adipose tissue mainly functions in:
A. Protection and insulation
B. Transport
C. Muscle attachment
D. Impulse conduction

Correct Answer: A
Explanation: Adipose tissue stores fat, provides insulation, and cushions organs.

Q8. Tendons connect:
A. Bone to bone
B. Muscle to muscle
C. Muscle to bone
D. Cartilage to bone

Correct Answer: C
Explanation: Tendons are dense connective tissues that transmit muscular force to bones.

Q9. Ligaments differ from tendons because they:
A. Are inelastic
B. Connect muscles
C. Contain more elastic fibres
D. Lack fibres

Correct Answer: C
Explanation: Ligaments have elastic fibres, allowing flexibility at joints.

Q10. The matrix of cartilage is called:
A. Ossein
B. Chondrin
C. Plasma
D. Keratin

Correct Answer: B
Explanation: Chondrin provides flexibility and support to cartilage.

Muscular & Nervous Tissue

Q11. Which muscle is involuntary but striated?
A. Skeletal
B. Smooth
C. Cardiac
D. Voluntary

Correct Answer: C
Explanation: Cardiac muscle shows striations but functions involuntarily.

Q12. Intercalated discs are found in:
A. Smooth muscle
B. Skeletal muscle
C. Cardiac muscle
D. Nervous tissue

Correct Answer: C
Explanation: Intercalated discs ensure coordinated contraction of heart muscles.

Q13. Smooth muscles are found in:
A. Limbs
B. Heart
C. Intestine
D. Tongue

Correct Answer: C
Explanation: Smooth muscles control involuntary movements like peristalsis.

Q14. The functional unit of nervous tissue is:
A. Nephron
B. Neuron
C. Sarcomere
D. Axon

Correct Answer: B
Explanation: Neurons receive and transmit nerve impulses.

Q15. Which part of neuron transmits impulses away from cell body?
A. Dendrite
B. Cyton
C. Axon
D. Synapse

Correct Answer: C
Explanation: Axon conducts impulses away from the neuron cell body.

Q16. Neuroglial cells function to:
A. Conduct impulses
B. Support neurons
C. Produce hormones
D. Digest food

Correct Answer: B
Explanation: Neuroglia support, nourish, and protect neurons.

Q17. Blood is classified as:
A. Loose connective tissue
B. Dense connective tissue
C. Fluid connective tissue
D. Skeletal tissue

Correct Answer: C
Explanation: Blood has a fluid matrix and transports materials.

Q18. Haemoglobin in earthworm is:
A. Absent
B. In red blood cells
C. Dissolved in plasma
D. In lymph

Correct Answer: C
Explanation: Earthworm haemoglobin is dissolved directly in plasma.

Q19. Which tissue lacks blood vessels?
A. Muscle
B. Bone
C. Epithelium
D. Connective

Correct Answer: C
Explanation: Epithelial tissue is avascular and depends on diffusion.

Q20. Which tissue shows maximum regenerative capacity?
A. Muscle
B. Nervous
C. Epithelial
D. Bone

Correct Answer: C
Explanation: Epithelial tissue regenerates rapidly due to frequent cell division.

Section B: Earthworm (MCQs 21–30)

Q21. Scientific name of earthworm is:
A. Rana tigrina
B. Periplaneta americana
C. Pheretima posthuma
D. Lumbricus terrestris

Correct Answer: C
Explanation: NCERT specifies Pheretima posthuma as the common earthworm.

Q22. Metamerism refers to:
A. Jointed appendages
B. Repeated body segments
C. Radial symmetry
D. Internal organs

Correct Answer: B
Explanation: Earthworm body is divided into repeated segments.

Q23. Locomotion in earthworm is aided by:
A. Parapodia
B. Cilia
C. Setae
D. Pseudopodia

Correct Answer: C
Explanation: Setae anchor the body to soil during movement.

Q24. The clitellum is involved in:
A. Respiration
B. Locomotion
C. Reproduction
D. Excretion

Correct Answer: C
Explanation: Clitellum secretes cocoon during reproduction.

Q25. Earthworm respiration occurs through:
A. Lungs
B. Tracheae
C. Gills
D. Skin

Correct Answer: D
Explanation: Earthworm respires cutaneously through moist skin.

Q26. Excretory organs of earthworm are:
A. Kidneys
B. Malpighian tubules
C. Nephridia
D. Flame cells

Correct Answer: C
Explanation: Nephridia remove nitrogenous wastes.

Q27. Earthworm circulatory system is:
A. Open
B. Closed
C. Absent
D. Double

Correct Answer: B
Explanation: Blood flows through vessels in a closed system.

Q28. Gizzard in earthworm helps in:
A. Absorption
B. Grinding food
C. Respiration
D. Excretion

Correct Answer: B
Explanation: Gizzard mechanically grinds ingested food.

Q29. Earthworm is hermaphrodite because it:
A. Changes sex
B. Has both sexes in one body
C. Lacks sex organs
D. Reproduces asexually

Correct Answer: B
Explanation: Male and female organs are present in the same individual.

Q30. Ventral nerve cord in earthworm helps in:
A. Circulation
B. Excretion
C. Coordination
D. Respiration

Correct Answer: C
Explanation: It controls movement and responses.

Section C: Cockroach (MCQs 31–40)

Q31. Scientific name of cockroach is:
A. Blatta orientalis
B. Periplaneta americana
C. Locusta migratoria
D. Musca domestica

Correct Answer: B
Explanation: NCERT specifies Periplaneta americana.

Q32. Cockroach body is divided into:
A. Head and trunk
B. Cephalothorax and abdomen
C. Head, thorax and abdomen
D. Head and abdomen

Correct Answer: C
Explanation: Typical insect body division.

Q33. Cockroach exoskeleton is made of:
A. Keratin
B. Chitin
C. Cellulose
D. Calcium

Correct Answer: B
Explanation: Chitin provides protection and rigidity.

Q34. Respiratory system of cockroach is:
A. Gill system
B. Lung system
C. Tracheal system
D. Skin respiration

Correct Answer: C
Explanation: Tracheae deliver oxygen directly to tissues.

Q35. Circulatory system in cockroach is:
A. Closed
B. Double
C. Open
D. Absent

Correct Answer: C
Explanation: Haemolymph flows in haemocoel.

Q36. Cockroach blood does not transport oxygen because:
A. Lacks vessels
B. Lacks haemoglobin
C. Is colourless
D. Has no heart

Correct Answer: B
Explanation: Oxygen is transported via tracheae.

Q37. Excretory organs of cockroach are:
A. Kidneys
B. Nephridia
C. Malpighian tubules
D. Flame cells

Correct Answer: C
Explanation: They remove nitrogenous wastes.

Q38. Antennae in cockroach function as:
A. Respiratory organs
B. Sensory organs
C. Locomotory organs
D. Digestive organs

Correct Answer: B
Explanation: They detect touch and smell.

Q39. Compound eyes provide:
A. Binocular vision
B. Tunnel vision
C. Mosaic vision
D. Night vision

Correct Answer: C
Explanation: Image formed from many ommatidia.

Q40. Gastric caeca help in:
A. Respiration
B. Digestion
C. Excretion
D. Circulation

Correct Answer: B
Explanation: They secrete digestive enzymes.

Section D: Frog (MCQs 41–50)

Q41. Scientific name of frog is:
A. Rana tigrina
B. Bufo bufo
C. Hyla arborea
D. Xenopus laevis

Correct Answer: A
Explanation: NCERT mentions Rana tigrina.

Q42. Frog belongs to class:
A. Reptilia
B. Amphibia
C. Pisces
D. Mammalia

Correct Answer: B
Explanation: Frog lives both on land and in water.

Q43. Frog skin is:
A. Dry and scaly
B. Moist and glandular
C. Hairy
D. Keratinised

Correct Answer: B
Explanation: Moist skin aids respiration.

Q44. Number of heart chambers in frog is:
A. Two
B. Three
C. Four
D. Five

Correct Answer: B
Explanation: Two atria and one ventricle.

Q45. Frog respiration occurs through:
A. Lungs only
B. Skin only
C. Gills only
D. Skin, lungs and buccopharynx

Correct Answer: D
Explanation: Multiple respiratory modes support amphibious life.

Q46. Frog circulatory system is:
A. Open
B. Closed
C. Absent
D. Single

Correct Answer: B
Explanation: Blood flows within vessels.

Q47. Webbed feet in frog help in:
A. Jumping
B. Respiration
C. Swimming
D. Digestion

Correct Answer: C
Explanation: Webbing increases surface area for swimming.

Q48. Excretory organs of frog are:
A. Nephridia
B. Malpighian tubules
C. Kidneys
D. Flame cells

Correct Answer: C
Explanation: Kidneys filter nitrogenous wastes.

Q49. Cloaca in frog is:
A. Respiratory chamber
B. Digestive gland
C. Common opening
D. Sensory organ

Correct Answer: C
Explanation: Common chamber for excretion, reproduction, digestion.

Q50. Frog digestion is completed in:
A. Stomach
B. Oesophagus
C. Small intestine
D. Cloaca

Correct Answer: C
Explanation: Enzymatic digestion completes in intestine.

Targeting Exams 

This MCQ set is specially designed to support preparation for:

• CBSE Class 11 Annual Examinations

• CBSE School-Based Unit & Term Tests

• NCERT-Based Objective Assessments

• Biology Olympiad (Foundation Level)

• NEET Foundation / Pre-Medical Concept Building

The questions emphasize structure–function relationships, a core focus of the CBSE assessment pattern.

Related Keyphrases 

• CBSE Class 11 Biology Chapter 7 MCQs

• Structural Organisation in Animals MCQ Questions

• NCERT Class 11 Biology MCQs with Explanations

• Animal Tissues MCQs Class 11

• Earthworm Cockroach Frog MCQs

• CBSE Biology Objective Questions Class 11

• Chapter 7 Structural Organisation in Animals Test Questions