๐Ÿ“– 12th Bio Zoology Important Questions 2025 โ€“ 2,3 & 5 Marks

๐Ÿ“– 12th Bio Zoology Important Questions 2025 โ€“ 2,3 & 5 Marks

๐Ÿ“š Boost Your Exam Preparation with Important Questions!
This 12th Bio Zoology Important Questions Guide is carefully designed for Tamil Nadu 12th Public Exam 2025 students. It includes chapter-wise 2-mark, 3-mark, and 5-mark questions, selected from previous year question papers, model exams, and textbook exercises.

โœ” Latest Tamil Nadu Board Exam Pattern & Syllabus
โœ” Chapter-wise 2, 3 & 5 Mark Important Questions
โœ” Includes Key Diagrams, Definitions & Functions
โœ” Previous Year Public Exam Questions with Answers

Biology Zoology Two Marks

NOTE : THIS IS TOP 20 IMPORTANT QUESTIONS BUT FOR 90+ REFER ADDITIONAL 2 & 3 MARKS FROM PURE SCIENCE BOTANY

  1. What is Apolysis?ch1
  2. Differentiate Spermiogenesis and Spermatogenesis.Ch2
  3. What is Ectopic pregnancy?Pg22
  4. Amniocentesis, the foetal sex determination test, is banned in our country. Is it necessary? Comment.Ch3
  5. How can Erythroblastosis foetalis be prevented?Ch4
  6. explain vasectomy and Tubectomy?Ln3 Pg35
  7. What is Thelytoky? Give an example.what is Amphitoky?PgCh1
  8. Expand the following:Ch3
  9. i) ZIFT
  10. ii) ICSI
  11. What is Lyonisation?Ch4
  12. What was the experimental proof of Meselson and Stahl?Ch5
  13. Define Hardy-Weinberg law.Ch6
  14. What is genetically engineered Insulin?Ch9
  15. What are biological products? Give an example.Ch9
  16. What is migration? Give an example.Ch10
  17. Differentiate between predator and prey.Ch10
  18. What is pedogenesis?Ch10
  19. Which are called Nonsense Codon in Genetic Code?Ch5
  20. Define Haematopoiesis.Ch7 Pg118
  21. What do you mean by Gene Knock Out?Ch9 pg158
  22. Give the characters of Biome.Ch10 Pg167
  23. Define BOD.Ch12

Biology Zoology Three Marks

  1. What is Parthenogenesis? Give two examples.Ch1
  2. Give a schematic representation of Spermatogenesis.Ch2
  3. How is polyspermy avoided in humans?Ch2
  4. Differentiate foeticide and infanticide.
  5. Write any three applications of Karyotyping.Ch4
  6. Differentiate between Divergent evolution and Convergent evolution with one example for each.Ch6
  7. Give the reasons for color blindness.Ch4
  8. How to prevent STDs?Ch3
  9. Diagrammatic view of the Female Reproductive system showing Uterus, Ovary, and Fallopian Tube.Ch2
  10. Distinguish between monocistronic and polycistronic conditions of the structural gene.Ch5
  11. What are transgenic animals? Give examples.Ch9
  12. What are interferons? Write about their role?Ch7
  13. Differentiate between somatic cell gene therapy and germ line gene therapy?ch10
  14. Give the diagnostic characters feature of a Biome.
  15. Define Natality and Mortality.Ch11
  16. Differentiate Monozygotic and Dizygotic Twins.Ch2
  17. How is sex determined in human beings?Ch4
  18. Draw and label the structure of Lymph Node.Ch8
  19. Mention the advantages / disadvantages of cloning.?Ch9
  20. Describe any three methods of disposal of radioactive wastes.ch12

Biology Zoology Five Marks

  1. What is parthenogenises?Explain the types of parthenogenesis?Ln1  Pg7
  2. Explain the various phases of the Menstrual cycle. Ch2
  3. Describe the structure of the human ovum with a neat labeled diagram.Ch2
  4. Write about any two sexually transmitted (STD) bacterial diseases.Ch3
  5. Tabulate any four viral STIs and their causative agents and two symptoms each.Ch3
  6. Explain various intrauterine devices?Ln3
  7. Explain the various technologies used for detecting foetal disorders during early pregnancy?Ln3 Pg40
  8. Explain the experimental approach to the origin of life by Urey and Miller with a suitable diagram.Ch6
  9. Explain the major reproductive events in human beings. Ch1
  10. What is Karyotyping? Write the applications of Karyotyping. Ch4
  11. List out the salient features of genetic code?Ln5
  12. Explain the Lac operon model with neat diagram?Ln5 Pg82
  13. Write the salient features of Human Genome Project?Ln5 Pg83
  14. What are recombinant vaccines? Explain the types.Ch10
  15. List the adaptations seen in terrestrial animals/Aquatics.Ch11
  16. Tabulate any five Human viral diseases?Ln7 Pg115
  17. Explain the structure of immunoglobin with a neat labelled diagram?Ln7 Pg124 Pg137
  18. Describe the structure of Uterus.Ch2
  19. What are the applications of Polymerase chain Reaction(PCR)?Ln10 Pg165
  20. Explain PCR (Polimer chain Reaction) in clinical Diagnosis?Ln10 Pg165
  21. Describe the preparation of human insulin from Recombinant DNA Technology?Ln10 Pg158
  22. Explain the structure of Hiv with suitable diagram and label the parts?Ln8 pg 141
  23. Give a schematic representation of inheritance of colour blindness by way of marriage between colour blind man and normal visioned women?Ln4
  24. Alien species invasion is a threat to endemic species – substantiate this statement?Ln12 BB20
  25. In E-Coli, three enzymesโ€”ฮฒ-galactosidase, permease, and transacetylaseโ€”are produced in the presence of lactose. Explain why the enzymes are not produced in the absence of lactose.Ch5
  26. Mention the major threats to biodiversity caused by human activities. Explain.Ch12
  27. Differences between r-selected and K-selected species.Ch10
  28. Explain the structure of HIV with a neat labeled diagram.Ch8
  29. Mention the salient features of the genetic code.Ch5
  30. Give an account of the properties of soil.Ch10
  31. Explain three stages of wastewater treatment?Ln13
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