Where GATE BT's marks have come from

This shows what was asked, not what will be asked: how many marks GATE BT's seven papers of 2019, 2020 and 2022–2026 gave to each subject the study library has published for BT, for a GATE BT candidate working out the subject component of a study plan. The GATE 2027 Information Brochure fixes the paper at 65 questions and 100 marks, with General Aptitude a constant 15 marks outside the subject syllabus. The remaining 85 marks, Engineering Mathematics plus the subject questions, are the subject component this post counts (GATE 2027 Information Brochure, printed page 4).

Where GATE BT's 85 subject marks have come from, paper by paper

Each of the three published subjects appeared in all seven papers. Fundamentals of Biological Engineering — Section 4 of the syllabus, which includes bioreaction engineering, upstream and downstream processing, and measurement and control — carried the most marks of the three in five of the seven papers: 2019, 2022, 2024, 2025 and 2026. Genetics, Cell and Molecular Biology carried the most in the other two, 2020 and 2023. Fundamentals of Biological Engineering also had the widest range, from 8 marks in 2020 to 29 in 2022; Genetics, Cell and Molecular Biology had the narrowest, 14 to 23. Recombinant DNA Technology and Tools ranged from 4 marks (2026) to 18 (2020).

The 'Not in a library subject yet' row is the largest row in every one of the seven papers: 30 to 40 marks a paper, 35.7 on average. These are marks on questions that are not under any of the library's published subjects. They include the three sections of the BT syllabus the library has not covered yet (Engineering Mathematics, General Biology, and Plant, Animal and Microbial Biotechnology) and can include a question from a covered section that we did not place under its subject. This post does not say what those marks were made of. (The library's Engineering Mathematics subject is built from the EC, EE and IN papers, so for BT, Engineering Mathematics is one of the sections not covered yet.)

GATE BT subjects in order of average marks per paper

By average marks per paper, the order runs Fundamentals of Biological Engineering at 20.4, Genetics, Cell and Molecular Biology at 16.7 and Recombinant DNA Technology and Tools at 12.1, with no ties. A plan that follows these marks would take Fundamentals of Biological Engineering first, Genetics, Cell and Molecular Biology second and Recombinant DNA Technology and Tools third. Three things limit that order. It is an order of averages, and the three subjects' paper-by-paper ranges overlap: 8–29, 14–23 and 4–18 marks. It ranks only the three subjects the library has published. The marks in the 'Not in a library subject yet' row, larger than any one of the three in every paper, sit outside it, and in the GATE 2027 brochure's pattern Engineering Mathematics alone carries 13 marks, more than Recombinant DNA Technology and Tools' 12.1-mark average, while the library has not covered it for BT. And a single paper can turn it round: in 2020, Fundamentals of Biological Engineering carried 8 marks against 23 for Genetics, Cell and Molecular Biology.

The GATE BT syllabus, section by section, against the study library

Three of the six sections of the official GATE 2027 BT syllabus are not covered by a published study subject yet: Engineering Mathematics (Section 1), General Biology (Section 2), and Plant, Animal and Microbial Biotechnology (Section 5). Their questions are in the papers but not in the library. Their marks are part of the first table's 'Not in a library subject yet' row, 30 to 40 marks a paper. That row can also include a question from a covered section that we did not place, so it is not made up of these three sections alone, and this post does not split it between them. Sections 3, 4 and 6 each correspond to one published subject. The papers themselves are at GATE BT previous-year papers; the GATE BT paper pages list every question of each paper in printed order with its official key; and the GATE BT syllabus-to-question map sets each line of the 2027 syllabus against the GATE 2026 questions we placed under it.