This page lists GATE BT previous year question papers for 9 years, 2016 to 2026, with 17 official PDFs (question papers and answer keys). GATE BT (GATE Biotechnology) is conducted by IISc Bangalore or one of the IITs, in rotation, and covers General Aptitude, Engineering Mathematics and BT core. Pick a year below for the paper, answer key and a timed practice plan; confirm dates and pattern on gate2027.iitm.ac.in.
Year-wise question papers
GATE BT 2026
GATE BT 2026 paper and answer key from IIT Guwahati, 20 NAT and 31 MCQ, 14 MSQ.
GATE BT 2025
GATE BT 2025 paper and answer key from IIT Roorkee, 17 NAT and 33 MCQ, 15 MSQ.
GATE BT 2024
GATE BT 2024 paper and answer key from IISc Bangalore, 15 NAT and 40 MCQ, 10 MSQ.
GATE BT 2023
GATE BT 2023 paper and answer key from IIT Kanpur, 26 NAT and 32 MCQ, 7 MSQ.
GATE BT 2022
GATE BT 2022 answer key from IIT Kharagpur, 20 NAT and 37 MCQ, 8 MSQ.
GATE BT 2019
GATE BT 2019 paper and answer key from IIT Madras, 18 NAT and 47 MCQ.
GATE BT 2018
GATE BT 2018 paper and answer key from IIT Guwahati, 20 NAT and 45 MCQ.
GATE BT 2017
GATE BT 2017 paper and answer key from IIT Roorkee, 20 NAT and 45 MCQ.
GATE BT 2016
GATE BT 2016 paper and answer key from IISc Bangalore, 18 NAT and 47 MCQ.
Not hosted: 2020, 2021. We could not retrieve a complete BT PDF from an official GATE site or its Internet Archive capture for those years, so no page is shown rather than a partial file.
Answer first
For GATE BT (BT), solve paper-code-specific previous year questions under timed conditions, keep General Aptitude alive weekly, and build a subject-weight tally from every BT paper you can get. Mixed-branch PDF dumps destroy the signal you need.
Why BT-only PYQs matter
- Official structure: Biotechnology has its own subject mix: Engineering Mathematics, Biochemistry and Cell Biology, Microbiology and Immunology, Molecular Biology and Genetics and more.
- NAT precision: Typed-answer questions reward unit discipline and the rounding range printed in the key. Log a correct setup with a wrong unit as a silly miss.
- MSQ logic: From 2021 the keys include multi-select questions, which score only when every correct option, and no wrong one, is chosen. Practise them with a written option audit.
- M.Tech, PhD and PSU alignment: The same BT papers feed several goals, with different cut-off arithmetic.
Pattern snapshot (verify brochure)
Single paper, computer-based, three hours. 65 questions for 100 marks: 10 General Aptitude (15 marks) and 55 Biotechnology questions (85 marks, with Engineering Mathematics inside the core). Question types are MCQ, NAT and, from 2021, MSQ. Wrong MCQ answers lose 1/3 or 2/3 of the question’s marks; MSQ and NAT have no negative marking.
| Block | Role in BT prep |
|---|---|
| General Aptitude | Fixed short daily or weekly block; high ROI marks |
| Engineering Mathematics | Weekly NAT pairs from sticky chapters |
| Core BT | Subjects chosen from your own paper tally; MSQ option audits |
Core topic map for GATE BT
Engineering Mathematics
Linear algebra, calculus, differential equations, probability and statistics, numerical methods.
Biochemistry and Cell Biology
Biomolecules, enzymes and kinetics, metabolism, cell structure, membrane transport, signalling.
Microbiology and Immunology
Microbial growth and genetics, bacteria and viruses, immune system, antibodies, vaccines.
Molecular Biology and Genetics
DNA replication, transcription, translation, gene regulation, Mendelian and population genetics.
Recombinant DNA Technology
Vectors, cloning, PCR, sequencing, expression systems, gene editing basics.
Plant and Animal Biotechnology
Tissue culture, transgenics, stem cells, cell-culture practice.
Bioprocess Engineering and Process Biotechnology
Fermentation kinetics, bioreactors, mass and heat transfer, downstream processing, process control.
Bioinformatics
Sequence alignment, databases, phylogeny, structure prediction basics.
Pareto guidance: Mark counts per subject are not tabulated on this hub, so build your own tally. After each paper, count how many questions each subject contributed and let the running average decide your order of study.
Prep timelines using BT PYQs
3-month plan
In month 1, sit one full BT paper to see where you stand, and work on your three weakest areas. In month 2, practise BT PYQs subject by subject, starting with the ones that carry the most marks in your tally. In month 3, alternate full papers with revising the formulas from your error log.
6-month plan
Finish the syllabus with weekly BT PYQ tagging. In the second half, sit one full paper most weeks plus subject revision from misses only. Use older papers for topic drills and keep the latest two years for timed mocks.
12-month plan
Syllabus, then subject-wise BT PYQs, then full papers, then revision cycles. Keep GA alive all year. Common weak spots to watch: Molecular biology, immunology, recombinant DNA technology and bioprocess engineering.
Common mistakes
- Solving mixed-paper dumps from other GATE codes.
- Ignoring the latest official BT syllabus PDF.
- No NAT re-entry practice.
- Skipping GA because core feels endless.
FAQ
Where can I find GATE BT previous year question papers?
On this hub: the official Biotechnology papers and answer keys for 9 of the 11 years from 2016–2026, from the organising institutes’ sites. Each year page links the original source.
How many years of GATE BT PYQs should I solve?
Aim for 8-10 recent years of paper code BT for subject weightage, with every recent year timed at least once.
Are GATE BT PYQs enough?
They are the best practice available, but they do not replace the official syllabus, studying the concepts, and keeping up General Aptitude and Engineering Mathematics.
Should I mix other GATE paper codes with BT?
No for core subject practice. GA can be cross-practised and mathematics templates transfer, but core questions should stay BT-only.
How should I use an error log?
Same day: tag each miss by block (GA, mathematics, core), subject, and miss type (concept, silly, time or misread). Next sessions repair logged items only.
Where to get the official papers
GATE BT question papers, answer keys and notifications are published by the IISc or IIT organising that year’s exam on its own GATE website (IIT Madras for GATE 2027: gate2027.iitm.ac.in). Download them from there. We link to the official files and add practice notes, but the latest official notification is the final word on dates, pattern and eligibility.