📖 11th Zoology Score 90+ Important 2, 3 & 5 Mark Questions – Public Exam 2025

📚 Ace Your Public Exam with Top-Scoring Zoology Questions!
The 11th Zoology Important Questions 2025 guide is designed to help Tamil Nadu 11th Public Exam students score 90+ marks. It contains chapter-wise, frequently asked 2, 3, and 5-mark questions based on previous year public exams, model tests, and textbook exercises. These repeated questions are

Important Diagram

  1. Draw and label LS of Kidney?Ln8 Pg135
  2. Structure of long bone
  3. Draw the LS of the human eye and label the parts?Ln10 Pg183
  4. Human digestive system?Ln5 Pg75
  5. Draw an ornithine cycle?Ln8 Pg137
  6. Draw the different types of wbc?Ln7 pg112
  7. Draw a neat labeled diagram of the digestive system of frog?Ln4 Pg65
  8. Draw and label the structure of human brian?Ln10 Pg183

Important Two Marks

  1. Mention the basic need of classification?Ln1 Pg2
  2. Give 2 examples for automated species identification tools?Ln1
  3. What are flame cells?Ln1
  4. What is the role of charles darwin in relation of concept of species?Ln1 BB12
  5. What are the differences between a zoo and a wild life sanctuary?Ln1 BB14
  6. Why mule is sterile in nature?Ln1 BB10
  7. What is cladogram?Ln1 Pg4
  8. What is pentamerous radial symmetry?Give example?Ln2
  9. Differentiate polyp and medusa?Ln2
  10. Give examples for economically important insects?Ln2 Pg24
  11. Classify the animals based on the body cavity?Ln 2 Pg17
  12. List three features that characterise bony fishes?Ln2 BB36
  13. What are the rules of cnidocytes?Ln2 Pg20
  14. Liat the functions of air bladder?Ch2 BB37
  15. Name the flight muscles in birds?Ans pectoralis major and pectoralis minor
  16. Why blood is considered as a typical connective tissue?Ln3 BB8
  17. What is autopsy?Ln3
  18. Differentiate Biopsy and Autopsy?Ln3 Pg45
  19. Write about exocrine gland?Ln3 Pg40
  20. What are earthworm casts?Ln4 BB15
  21. What is clitellum?Ln4
  22. Differntiate between tergum and a sternum?Ln4 BB24
  23. How do earthworms breathe?Ln4 BB16
  24. What characteristics are used to identify the earthworms?BB14
  25. What is clitellum?Mention its functions?Ln4 Pg48
  26. Head of cockroach is called hypognathous?why?Ln4 Pg55
  27. What are the components of blood in frog?BB26
  28. Why are villi present in the intestine and not in the stomach?Ln5 BB17
  29. Write the enzymes present in succus entericus?Ln5 Pg81
  30. What is gastro oesophagus reflex disorder?Ln5 Pg75
  31. Explain liver cirrhosis?Ln5 Pg86
  32. What is obesity?How calculate BMI?LN5 Pg 87
  33. Name the enzymes in the intestinal juices?Ln5 PG81
  34. Which structure seals the larynx when we swallow?Ln6 BB20
  35. Resistance in the airways is typically low.why give two reasons?Ln6 Q21
  36. What is Methaemoglobin?Ln6 Pg99
  37. Air moving from the nose to the trachea passes through a number of structures.List in order of the structures?Ln6 BB19
  38. Write the mechanism of breathing?Ln6
  39. Right ventricular is thinner than the left ventricular wall.why?Ln7 BB18
  40. What are anastomoses?Ln7 Pg116
  41. Why protein molecules of larger size can pass through the lymph vessels?Ln7 Pg115
  42. Define Atherosclerosis?Ln7 Pg124
  43. What does a pacemaker do?Ln7
  44. Mention the uses of surfactants?Ln7 Pg97
  45. If a person’s breath and heart – Beat had stpped abruptly due to electric shock how will you save the person at that time of emergency?LN7 Pg129
  46. Note on stroke?Ln7 Pg127
  47. Name the three hormones involved in the regulation of the renal function?BB33 Ln 8
  48. List out the various waste products of protein metabolism?Ln8 Pg137
  49. What is meant by juxta medullary nephrons?LN8 Pg140
  50. What is micturition?Ln8 pg146
  51. What is physiotherapy?Ln9 Pg172
  52. Name the bones of the skull?Ln9 BB27 Pg162
  53. When describing a skeletal muscle,what does “striated” means?Ln9 BB24
  54. Name the contractile proteins present in the skeletal muscle?Ln9 Pg157
  55. Why is the blind spot so called?Ln10 Pg192 BB15
  56. What is otolith?Ln10 Pg195
  57. The action potential occurs in response at threshold stimulus;but not at sub threshold stimulate.Name the principle involved?Pg181 Ln10 BB17
  58. Write the functions of cholecystokinin(cck)?Ln11 Pg213 BB24
  59. Harmones are known as chemical messengers.Justify?Ln11 Pg203
  60. Name the three zones which are present in adrenal gland?Ln11 Pg210
  61. Write the symptoms of cretinism?Ln11 Pg214
  62. Cornea transplant in human is almost never rejected.state the reason.Ln11 BB19
  63. Name the hormones responsible for circadian rhythm?Ln11 Pg207
  64. What are the types of Sphygmomanometer?Ln12 Pg223
  65. Write the advantages of composite fish farming?Ln13 Pg252
  66. Write the advantages of vermi composting?Ln13 Pg240
  67. Explain : using vermicompost?Ln13 Pg239?
  68. What are the various types of prawn fishery?LN13 Pg253
  69. What are the various types of hearing loss?
  70. What happens to the drones after mating flight? BB19
  71. What is called sericulture?Ch13

Important Three Marks

  1. Differentiate incomplete and complete digestive system?Pg15 Ln1
  2. Compare schizocoelom with enterocoelom?Ln1 PG17
  3. Differentiate between probiotics and pothogenic bacteria?Ln1 Pg5
  4. List any five salient features of the family Felidae?Ln1 BB11
  5. What is monotypic and polytypic genus.Give Examples?Pg7
  6. What is coelom?write its types?Ln2 Pg17
  7. Differentiate chordates and Non-chordates?Ln2 Pg27
  8. What are the four characteristics common to most animals?Ln2 BB23
  9. List the characteristic features that distinguish cartilagenous fishes with living jawless fishes?Ln2 Pg35
  10. Write any 3 characteristic features of class mammalia?Ln2 Pg31
  11. Differentiate between diploblastic and triploblastic?Ln2 Pg16
  12. Differentiate white adipose tissue from brown adipose tissue?Ln3 Pg42
  13. Some epithelia are pseudostratified what does this mean?Ln3 Pg39
  14. Write notes on any two connective tissue disorders?Ln3 Pg44
  15. What is brown adipose tissue?Mention their significance?Ln3 Pg42
  16. What are cell junction.write its types?Ln3 Pg41
  17. How are earth worms classified based on ecological strategies- give examples?Ln4 Pg48
  18. Why do we call cockroach a pest?Ln4 Pg61 BB17
  19. Write the economic importance of frog?Ln4 Pg69
  20. Write the Types of respiration seen in frogs?Ln4 Pg65
  21. Write note on appendicitis?Ln4 Pg84
  22. Explain frog metamorphosis?Ln4 Pg69
  23. Write the classification of frog?Pg62
  24. Write the differences between a frog and toad?Ln4 Pg63
  25. Describe about reproductive system of cockroach?Ln4 Pg60
  26. bile juice contains no digestive enzymes yet it is important for digestion?whyLn5 BB18
  27. Name the ducts present in salivary glands?Ln5 pg77
  28. Name the salivary glands present in the buccal cavity of human?Ln5
  29. What is succus entericus?write about its role in digestion?Ln5 Pg81
  30. Write about Protein energy malnutrition?Ch5 Pg86
  31. Write about Human dental formula?Ch5 Pg74
  32. Why do some people snore?Ln6 Pg98
  33. Why is pneumonia considered a dangerous disease?Ln6 Pg102 BB23
  34. Write short notes on “Dead space” in respiration?Ln6 Pg99
  35. Write down the conditions that favours the formation of oxyhaemoglogin?Ln6 pg100
  36. Explain haemoglobin?Ln6 Pg99
  37. What is Emphysema?Ln6Pg 105
  38. What is acute mountain sickness? Ln6 Pg104
  39. What are the primary functions of respiratory system?Ln6 Pg95
  40. Write a note on Aneurysm?Ln7 Pg125
  41. Distinguish between mitral valve and semilunar valve?Ln7 BB17
  42. What is lymph?write its functions?Ln7 Pg114
  43. Define Laplace law?what do you infer from this?Ln7 Pg117
  44. What is cardio pulmonary resuscitation?when it is done?Ln7 Pg125
  45. Distinguish between arteries and veins.Ln7 BB15
  46. What is erythroblastosis foetalis?Ln7 Pg117
  47. Diferentiate cortical from medullary nephrons?Ln8 Pg136
  48. Compare – Ammonoteles,Uricoteles and Ureoteles?Ln8 Pg113
  49. Write about the ornithine cycle?Ln8 Pg137
  50. How is urea formed in the human body?Ch8 BB152
  51. How is tetany caused?Ln9 Pg165
  52. What are the different types of rib bones that form the rib cage?Ln9 BB32
  53. Write about different types of movement?Ln9 Pg151
  54. What are the bones present in middle ear?Ln9 Pg163
  55. Why the limbic system is called the emotional brain?name its parts?Ln10 Pg177
  56. Pleasant smell of food urged a person to rush into the kitchen.Name the parts of the brain involved in the identification of food and emotional response to odour?Ln10 BB18
  57. What is presbyopia?Ln10 Pg185
  58. Note on reflex action and reflex arc?Ln10 Pg180
  59. Functions of brain lobes?Ln10 Pg183
  60. Specify the symptoms of acromegaly?Ln11 Pg206
  61. Pituitary gland is commonly called”Master Gland” of the body.why?Ln11 Pg200
  62. Comment on homeostasis?pg204
  63. What are the advantages of articifial insemination?Ln12 Pg234
  64. Enumerate the benefits of poultry farming?Ln12 Pg238
  65. Write any three uses of silk?Ln12 Pg222
  66. Write the clinical significance of ultrasound imaging?
  67. Government insists that wearing helmet is compulsory for two – wheeler rides.List down the biological reasons for favouring this decision?
  68. Compare the anatomical features between phylum annelida and arthropoda?

Important Five Marks

  1. List out the rules of nomenclature?Ln1 Pg10
  2. Write notes on the domain archaea?Ln1 Pg5
  3. Write the scematic diagram of systamatics of human being?Ln1 Pg8
  4. Explain the Taxnonomical hierarchy?Ln1 Pg7
  5. Write notes about classical taxonomical tools?Ln1 Pg11
  6. Write notes on the fundamental distinct features of chordates?Ln2 Pg26
  7. List out the biological characters of class chondrichthyes?Ln2 Pg29
  8. Compare chordates and non – chordates?Ln2 Pg27
  9. List out the salient features/ general characteristics of phylum arthropoda?Ln2 Pg24
  10. Classification of kingdom animalia based on common fundamental features?Ln2 Pg14
  11. Write the characteristics features of phylum chordata?Ln2 Pg26
  12. Write the characteristic features of Mammalia?Ch2
  13. What is epithelium?Enumerate the characteristics features of different epithalia?Ln3 Pg38
  14. Give the schematic representation of glandular epithelium?Ln3 Pg40
  15. Write the classification of connective tissue and their functions?Ln3 41
  16. Explain the male reproductive system of frog?Ln4 Pg68
  17. Expalin the digestive system of frog with suitable diagram?Ln4 Pg65
  18. Differentiate male and female cockroach?Ln4 Pg57
  19. Explain the life cycle of Lampito mauritii(Earth Worm) with diagram?Ch 4Pg54
  20. Lampito maruitti – Explain Nephridia and Excretory system?Ch4
  21. List the chemical changes that starch molecules undergoes from the time it reahes the small intestine?Ln5 BB19
  22. Write the functions of liver?Ln5 Pg78
  23. Describe in detail,the process of digestion in the small intestine?Ln5 Pg80
  24. Sketch the flow chart to show the path way of air flow during respiration?Ln6 Pg96 BB25
  25. Explain how carbondioxide is transported in lungs?Ln6 Pg100
  26. How does blood transport o2 from the lungs to the tissue cells?Ln6 Pg100
  27. Write the effects of smoking in detail?Ln6 Pg103
  28. Explain events in inspiration and expiration in human?Ln6 Pg96
  29. Describe the mechanism by which the human heart beat is initiated and controlled?Ln7 BB20
  30. Explain the various types white blood cells?Ln7 Pg112
  31. Explain the origin and conduction of heart beat?n7 pg119
  32. In our heart the four chambers are completely partioned.it results in non-mixing of oxygenated blood with deoxygenated blood.Explain the double circulation related to it?Ln7 Pg123
  33. How will you identify the compatibility between donar and recipient in ABO blood group prior to transfusion of blood?Explain it?Ln7 Pg113
  34. Explain ABO blood groups in man?Ln7 Pg113
  35. Explain how urine is formed in the human body?Ln8 Pg137
  36. A person is suffering from chronic renal failure.what are the treatment measures you will suggest?Explain?Ln8 pg144
  37. Explain the structure of nephrons?Ln8 Pg136
  38. Write the functions of skeletal system?Ln9 Pg162
  39. Explain the sliding theory of muscle- contraction?Ln9 Pg158
  40. List the disorders of the muscular system.Explain?Ln9 Pg169 BB34
  41. What are the types of movement?Ch9
  42. Differentiate between rod and cone cells?Ln10 Pg195
  43. Explain the various types of refractive errors of eye?comment on its corrective measuresLn10 Pg192
  44. Explain the structure of neuron with a labelled diagram?Ln10 Pg170
  45. Classify receptors based on type of stimuli.Ch10 BB24
  46. Comment on the functions of adrenalin?Ln11 BB27
  47. Write short notes on :1)Myxodema 2)Addison’s disease 3)Hypoglycemia?Ln11 Pg 214
  48. Why adrenalin is a hormone of flight,fright and fight?Ln11 Pg203
  49. Explain the structure of pancreas.Write about the hormones secreted by pancreas and their functions?Ln11 Pg204
  50. Describe thyroid gland and its secretion?Ln11 Pg201
  51. Discuss the various techniques adopted in cattle breeding?Ln12 Pg223 BB27
  52. What is called artificial insemination? What are the advantages of artificial insemination?Ln12 Pg234
  53. Tabulate the different types of silkworm?Ln12 Pg219
  54. Write notes on economically important byproducts of fishes?Ln13 Pg253
  55. Economic importance of fish?Ch13 Pg253
  56. Mention the advantages of MOET?Ch13 Pg256
  57. Write fat soluble vitamines and their functions and symptoms of deficiency?
  58. Explain the different types of bone fracture?(Only for bio Zoology)
  59. What is ct scanning?Write the significance of CT scan?
  60. List the primary functions of sympathetic and para sympathetic nervous system?
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