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Tamil Nadu Class 12 Zoology Syllabus 2026-27 (TN HSC Plus Two) – PDF Download

The TN Class 12 Zoology syllabus 2026-27 has 5 units and 13 chapters. The exam is for 100 marks: 70 theory, 20 practical and 10 internal assessment. The theory paper is 3 hours long. The minimum pass mark is 35 out of 100.
authorImageNeha Tanna8 Oct, 2026
Tamil Nadu Class 12 Zoology Syllabus

 

Preparing for the TN HSC (Plus Two) board exam in March 2027? This page gives you the chapter-wise Zoology syllabus, exam pattern, passing marks and preparation tips. Once you know the syllabus, check the TN HSE 2nd year time table 2027 and plan your revision around the exam dates.

Quick Overview: TN 12th Zoology 2026-27

Particulars Details
Board Directorate of Government Examinations (DGE), Tamil Nadu
Examination HSE (+2) / TN HSC Public Exam
Class 12th (Plus Two)
Subject Zoology
Academic year 2026-27
Expected exam month March 2027
Total units 5
Total chapters 13
Total marks 100
Theory 70 marks
Practical 20 marks
Internal assessment 10 marks
Theory exam duration 3 hours
Question paper sections 4 (Section A to D)
Minimum pass marks 35 out of 100 (15 out of 70 in theory)

Tamil Nadu Class 12 Zoology Syllabus 2026-27: Chapter-wise

The Samacheer Kalvi Class 12 Zoology syllabus is divided into five units and 13 chapters.

Unit Chapter Key topics
Unit I: Reproduction Chapter 1: Reproduction in Organisms Modes of reproduction, asexual and sexual reproduction [add subtopics from PDF]
Unit I: Reproduction Chapter 2: Human Reproduction Male and female reproductive systems, gametogenesis, fertilisation, pregnancy [add subtopics]
Unit I: Reproduction Chapter 3: Reproductive Health Birth control, infertility, assisted reproductive technologies [add subtopics]
Unit II: Genetics and Evolution Chapter 4: Principles of Inheritance and Variation Mendelian inheritance, linkage, chromosomal disorders [add subtopics]
Unit II: Genetics and Evolution Chapter 5: Molecular Genetics DNA structure, replication, transcription, translation, gene regulation [add subtopics]
Unit II: Genetics and Evolution Chapter 6: Evolution Origin of life, evidences of evolution, theories, human evolution [add subtopics]
Unit III: Human Health and Microbiology Chapter 7: Human Health and Diseases Pathogens, common diseases, cancer, drug and alcohol abuse [add subtopics]
Unit III: Human Health and Microbiology Chapter 8: Immunology Immune system, types of immunity, antigens and antibodies [add subtopics]
Unit III: Human Health and Microbiology Chapter 9: Microbes in Human Welfare Microbes in food, industry, sewage treatment, biogas [add subtopics]
Unit IV: Biotechnology Chapter 10: Applications of Biotechnology Biotechnology in health and agriculture, transgenic organisms, ethical issues [add subtopics]
Unit V: Ecology and Environment Chapter 11: Organisms and Populations Organism and environment, population attributes and interactions [add subtopics]
Unit V: Ecology and Environment Chapter 12: Biodiversity and its Conservation Levels of biodiversity, loss of biodiversity, conservation [add subtopics]
Unit V: Ecology and Environment Chapter 13: Environmental Issues Pollution, waste management, climate change, ozone depletion [add subtopics]

Download the TN 12th Zoology Syllabus 2026-27 PDF 

Studying other subjects too? You can find them all in the Tamil Nadu HSC syllabus guide, and Botany students can start with the Tamil Nadu 12th Botany PYQs to see how the two papers compare.

Is the Syllabus Changed or Reduced in 2026-27?

No, the Tamil Nadu HSE +2 (Class 12) Zoology and Bio-Zoology syllabus has not been changed or reduced for the 2026–27 academic year.
The curriculum remains stable and is based on the standard Tamil Nadu State Board Textbooks. According to the Directorate of Government Examinations (TNDGE), the full Samacheer Kalvi syllabus is expected to be tested for the upcoming board exams with no major reductions or cuts announced for the senior secondary classes.

TN 12th Zoology Exam Pattern 2026-27

Zoology carries 100 marks, split into theory, practical and internal assessment. The theory paper is 3 hours long. The other subjects follow a similar structure, which you can compare in the TN Class 12 exam pattern.

Component Marks
Theory 70
Practical 20
Internal assessment 10
Total 100
Theory exam duration 3 hours

TN HSE+2 Zoology Question Paper Pattern

The 70-mark theory paper has four sections.

Section Question type Marks per question
Section A Objective / MCQs 1 mark
Section B Very Short Answer 3 marks
Section C Short Answer 5 marks
Section D Long Answer 10 marks

Approximate Unit-wise Marks Weightage

In the Tamil Nadu HSE (+2) State Board Exam, the Biology paper is divided equally into Bio-Botany (35 marks) and Bio-Zoology (35 marks), making the total theory component 70 marks. The remaining 30 marks are split between Practicals (20 marks) and Internals (10 marks). 
Because the Directorate of Government Examinations (DGE) allows flexibility in question choice across sections (Part I to Part IV), the aggregate marks allotted per unit including options typically totals around 58 to 60+ marks, from which you must write answers for exactly 35 marks.
Topic group Chapters Approx. marks Focus areas
Genetics, Evolution and Reproduction 1–6 18–22 Principles of Inheritance, Molecular Genetics, Human Reproduction
Biotechnology and Human Welfare 7–10 16–21 Applied biotechnology, human health, immunology, microbes
Ecology and Environment 11–13 9–12 Organisms and populations, biodiversity, environmental issues

Passing Marks in Tamil Nadu 2nd Year Zoology

To pass TN HSE +2 (Class 12) Zoology you need at least 35 marks out of 100 overall.

  • Overall minimum: 35 marks across theory, practical and internal assessment combined.

  • Theory minimum: at least 15 out of 70 in the written paper.

  • Practical and internal: no separate minimum, but appearing for the practical exam is mandatory.

Practical and Internal Assessment (30 Marks)

Practical (20 marks) and internal assessment (10 marks) together make up 30 of the 100 marks, so they are an easy place to score. [Add the list of experiments, spotters and record-work marking from the official practical scheme.]

How to Prepare for the TN HSE+2 Zoology Exam 2026-27

1. Study unit by unit

Finish one unit completely before starting the next. Genetics and Evolution is the heaviest conceptual unit, so give it the most time. If you prefer guided classes, the Tamil Nadu Class 12 batches cover the full syllabus unit by unit.

2. Understand concepts instead of memorising

Learn how the steps connect, for example from DNA to protein or from infection to immune response. This makes answers easier to recall and write.

3. Make short notes

Keep concise notes of definitions, processes, classifications, examples and key terms. They are most useful in the last two weeks before the exam.

4. Practise every question type

Solve 1-mark MCQs, short answers and long answers separately. Notice how much detail each mark category needs, then test yourself with the TN 12th model papers, which follow the board’s paper format.

5. Practise diagrams

Practise the labelled diagrams in the Reproduction, Human Health and Genetics chapters. Neat, correctly labelled diagrams help you score well in long answers.

6. Start practical preparation early

Practical and internal marks are worth 30 of the 100 marks. Revise experiments and spotters along with theory.

7. Solve previous year papers

Attempt a few full 3-hour papers from the TN 12th previous year question papers. They show which topics repeat and help you improve your speed.

 

FAQs on Tamil Nadu Class 12 Zoology Syllabus 2027

What are the major topics in the Tamil Nadu Class 12 Zoology Syllabus 2027?

The syllabus covers Reproduction, Genetics and Evolution, Human Health and Microbiology, Biotechnology, and Ecology and Environment.

What is the exam pattern for Tamil Nadu Class 12 Zoology 2027?

The subject carries 100 marks, including 70 marks for theory, 20 marks for practicals, and 10 marks for internal assessment. The theory exam is of 3 hours.

How many marks are allotted to the Tamil Nadu Class 12 Zoology theory paper?

The theory examination carries 70 marks. The paper includes MCQs, very short-answer questions, short-answer questions, and 5-mark essay questions with internal choices.

How should I prepare for TN 12th Zoology in the last month?

Revise your short notes, practise labelled diagrams, solve previous year and model papers under timed conditions, and revise practical work alongside theory.

Which chapters are the most important in TN 12th Zoology?

Every unit is part of the exam, so cover all of them. Students usually spend extra time on Molecular Genetics, Human Reproduction, Human Health and Diseases, Immunology and Applications of Biotechnology because they involve many processes and diagrams.
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