Disclaimer: This data is intended solely for overall trend analysis. It has been compiled by Crispr Learning to help students understand chapter-wise trends in the IAT over the years. It does not reflect or represent the official IISER exam pattern and should be viewed purely as statistical information. Since many IAT questions involve multiple concepts, each question has been mapped to the most dominant chapter. This data is for reference only. Students are strongly advised to study the complete IAT syllabus prescribed by IISERs to achieve the best possible rank.
*Click on the table header to sort columns
IAT Biology 2017-2025
Chapter ↕
2017 ↕
2018 ↕
2019 ↕
2020 ↕
2021 ↕
2022 (W) ↕
2022 (O) ↕
2023 ↕
2024 ↕
2025 ↕
Total ↕
4. Principles of Inheritance and Variation
1
1
1
0
0
3
1
1
1
2
11
9. Biotechnology: Principles and Processes
1
2
1
0
1
1
1
1
2
1
11
5. Molecular Basis of Inheritance
0
1
1
1
2
1
1
1
1
1
10
7. Human Health and Disease
2
1
1
1
1
1
0
1
2
0
10
9. Biomolecules
1
2
1
0
1
0
0
2
0
1
8
10. Cell Cycle and Cell Division
1
1
0
1
1
1
2
1
0
0
8
11. Photosynthesis in Higher Plants
0
0
1
1
2
0
1
0
1
1
7
1. Sexual Reproduction in Flowering Plants
0
0
1
1
1
0
0
1
2
1
7
*Deleted topic
1
1
0
2
1
0
0
2
0
0
7
4. Animal Kingdom
1
1
0
1
0
1
0
0
1
1
6
6. Evolution
1
0
1
1
1
1
0
1
0
0
6
11. Organisms and Populations
1
0
0
1
2
0
1
0
1
0
6
7. Structural Organisation in Animals
1
0
1
0
1
0
1
1
0
0
5
12. Respiration in Plants
1
0
0
0
0
2
0
0
1
1
5
15. Body Fluids and Circulation
1
1
1
0
0
1
1
0
0
0
5
16. Excretory Products and their Elimination
0
2
0
1
0
1
0
0
0
1
5
12. Ecosystem
0
0
0
1
0
1
0
1
0
1
4
8. Cell: The Unit Life
1
1
0
0
0
1
0
0
0
1
4
17. Locomotion and Movement
0
0
0
1
0
0
1
0
1
1
4
5. Morphology of Flowering Plants
0
0
1
1
1
0
0
0
0
0
3
2. Human Reproduction
1
0
0
0
0
0
1
1
0
0
3
13. Biodiversity and Conservation
0
1
1
0
0
0
0
1
0
0
3
6. Anatomy of Flowering Plants
0
0
0
0
0
0
0
1
1
0
2
14. Breathing and Exchange of Gases
0
0
0
0
0
0
0
0
1
1
2
18. Neural Control and Coordination
0
0
1
0
0
1
0
0
0
0
2
2. Biological Classification
0
0
1
0
0
0
0
0
0
0
1
3. Plant Kingdom
0
0
0
0
0
0
1
0
0
0
1
13. Plant Growth and Development
0
0
0
0
0
0
1
0
0
0
1
19. Chemical Coordination and Integration
0
0
0
0
0
0
1
0
0
0
1
8. Microbes in Human Welfare
0
0
1
0
0
0
0
0
0
0
1
10. Biotechnology and its Applications
0
0
0
0
1
0
0
0
0
0
1
1. The Living World
0
0
0
0
0
0
0
0
0
0
0
3. Reproductive Health
0
0
0
0
0
0
0
0
0
0
0
IAT Chemistry 2017-2025
Chapter ↕
2017 ↕
2018 ↕
2019 ↕
2020 ↕
2021 ↕
2022 (W) ↕
2022 (O) ↕
2023 ↕
2024 ↕
2025 ↕
Total ↕
5. The Coordination Compounds
4
0
2
2
2
2
3
0
2
1
18
*Deleted topic
0
2
2
2
1
2
1
5
0
0
15
4. Chemical Bonding and Molecular Structure
1
1
2
1
2
0
2
1
2
2
14
8. Aldehydes Ketones and Carboxylic Acids
4
0
0
2
2
0
2
0
0
2
12
2. Electrochemistry
1
1
1
1
1
1
1
0
1
2
10
6. Haloalkanes and Haloarenes
0
2
1
1
1
2
1
2
0
0
10
2. Structure of Atom
1
1
0
1
1
1
0
1
1
1
8
5. Thermodynamics
1
1
1
1
0
0
1
1
1
1
8
3. Chemical Kinetics
1
0
1
1
2
0
1
0
1
1
8
9. Amines
1
2
2
0
0
1
0
0
1
1
8
9. Hydrocarbons
1
1
0
0
0
2
0
1
1
1
7
8. Organic Chemistry-Some basic principles and techniques
0
0
1
0
2
1
1
1
1
0
7
10. Biomolecules
0
0
1
1
0
0
0
1
1
1
5
3. Classification of Elements and Periodicity in Properties
