GATE Life Sciences Syllabus, Exam Pattern, Eligibility

XL doesn't follow the 15/13/72 split of the engineering papers. Its 100 marks are General Aptitude 15, XL0 Chemistry 25 and two optional sections at 30 each. XE, XH, AR, GE, GG and RA also use optional parts.

Question types

MSQ gives no partial credit: you need every correct option and no wrong one. An on-screen virtual calculator is provided; physical calculators aren't allowed.

Two papers

You can sit two papers from a published list of pairs. With XL as the first, the second can only be BT, CY or EY.

Each XL section has its own syllabus PDF on the GATE 2027 site. The opening topics of each are below; the full lists are in the official XL syllabus.

XL0 Chemistry (compulsory, 25 marks)

Atomic structure and periodicity: Planck's quantum theory, wave-particle duality, the uncertainty principle, Bohr's model and the quantum mechanical hydrogen atom, electronic configuration, Hund's rule, the Pauli exclusion principle, and periodic properties (ionization energy, electron affinity, electronegativity, atomic size).

Structure and bonding: ionic and covalent bonding; MO and VB approaches for diatomic molecules; VSEPR and molecular shape; hybridization; resonance; dipole moment; bond length, angle and energy; hydrogen bonding and van der Waals interactions; ionic solids, ionic radii and lattice energy. Further topics follow in the XL0 document.

XL1 Biochemistry

Biomolecules (water, carbohydrates, lipids, proteins, nucleic acids); protein structure, folding and misfolding; myoglobin, haemoglobin, lysozyme, ribonuclease A, carboxypeptidase and chymotrypsin. Enzymes: catalysis, specificity, regulation, kinetics up to two substrates, inhibitors, vitamins and coenzymes, hormonal regulation, ATP. Metabolic pathways: glycolysis, TCA cycle, pentose phosphate pathway, oxidative phosphorylation, gluconeogenesis and more.

XL2 Botany

Plant systematics: nomenclature, the APG system, major families (Apiaceae, Apocynaceae, Asteraceae, Lamiaceae, Myrtaceae, Solanaceae, Verbenaceae, Poaceae, Orchidaceae), phylogenetics and cladistics, DNA barcoding, herbaria in India. Plant anatomy: meristems, stelar organization, xylem and phloem, secondary growth and wood anatomy, plant versus animal cells. Then plant development and the rest of the XL2 document.

XL3 Microbiology

History of microbiology and spontaneous generation. Methods: pure culture, disinfection and sterilization, microbial nutrition, enrichment culture, antigen and antibody detection, light, phase contrast, fluorescence and electron microscopy, PCR and real-time PCR, CRISPR-Cas. Then microbial taxonomy and diversity (bacteria, archaea) and the rest of the XL3 document.

XL4 Zoology

Animal diversity and phylogeny. Evolution: origin of life, natural selection, adaptation, speciation. Genetics: inheritance, sex determination, linkage and gene mapping, population genetics, genetic disorders, model organisms. Biochemistry and molecular biology: replication, transcription, translation, Krebs cycle, glycolysis, enzyme catalysis, and the rest of the XL4 document.

XL5 Food Technology

Food chemistry and nutrition: carbohydrates (starch gelatinization and retrogradation, pectic substances, dietary fibre), proteins and denaturation, lipids and rancidity, pigments (carotenoids, chlorophylls, anthocyanins, myoglobin, curcumin, betalains), flavours, enzymes and browning. Further topics follow in the XL5 document.

General Aptitude (15 marks, common to every paper)

Verbal: grammar, vocabulary, reading comprehension, narrative sequencing. Quantitative: data interpretation, ratios, percentages, logarithms, permutations, series, mensuration, statistics and probability. Analytical: deduction, induction, analogy, numerical reasoning. Spatial: transformation of shapes, paper folding and cutting, patterns in 2 and 3 dimensions.

Qualification

You must be in the 3rd or higher year of any undergraduate degree, or already hold a government-approved degree in Engineering, Technology, Architecture, Science, Commerce, Arts or Humanities.

That includes B.E., B.Tech., B.Pharm., B.Arch., three-year B.Sc./B.A./B.Com., M.Sc./M.A./MCA, professional degrees such as MBBS, BDS and B.V.Sc., and professional society exams recognised as equivalent to B.E./B.Tech./B.Arch. With an international degree you must be in the 3rd year or higher, or hold a bachelor's degree of at least three years.

Not required

• No age limit.
• No limit on attempts.
• Your degree doesn't have to match the paper.

Fee, per paper

Two papers cost double: Rs 2,000 / Rs 4,000 in the regular window, Rs 2,500 / Rs 4,500 in the extended one. Every woman pays the concessional fee, whatever her category.

The portal

Apply through GOAPS, linked from gate2027.iitm.ac.in. GATE 2027 adds live facial verification and DigiLocker to registration. A paid rectification window after the closing date lets you correct details already submitted; it isn't a second chance to register.

Admission

GATE scores are used for M.Tech, M.E., M.S. and direct PhD admission at the IITs, IISc, NITs, IIITs and many central and state institutions, and for MoE assistantships.

The IITs and IISc admit through COAP; NITs and IIITs through CCMT. Each needs its own registration. A GATE score alone doesn't admit you anywhere.

Recruitment

GATE Life Sciences is used mainly for M.Sc., M.Tech. and PhD admission. PSU advertisements that recruit on GATE usually name engineering papers, so check each advertisement's eligibility list before assuming XL is accepted.

GATE runs at centres across India and a few abroad. You list preferred cities in the application; the allotted city is announced on 4 January 2027, before the admit card. Preference is followed where capacity allows but isn't guaranteed. The centre address is on the admit card.

GATE 2027, organised by IIT Madras.

The opening date moved twice, from 14 August 2026 to 27 August and then to 2 September, so check the official dates page. There are six exam days this time against four in GATE 2026, because of 30 papers and the new Robotics and Automation paper.

Download it from GOAPS with your enrolment ID or email and password. The exam city comes first, on 4 January 2027; IIT Madras hasn't fixed the admit card date yet.

Bring the admit card and the original photo ID whose details you entered in the application. A different ID or a photocopy isn't accepted.

• Marks out of 100: what you scored in your session.
• GATE Score out of 1000: normalised against the qualifying mark and the top scorers. This is the number institutes and employers compare.

Papers held in more than one session are normalised across sessions. The score is valid for three years from the result.

The response sheet and provisional answer key come out before the result, with a paid challenge window. The final key can differ from the provisional one.

GATE publishes a qualifying mark for each paper and category, set each year from that year's results. It gets you a scorecard, nothing more.

The score needed for an IIT M.Tech seat or a PSU call is far higher, and each institute or PSU sets its own in its admission round or advertisement.

1. Start with the chemistry section. XL0 is 25 marks, compulsory, and for most XL candidates the furthest from their degree.
2. Pick your two optional sections early. They're 60 of the 100 marks. Sampling three and deciding late means preparing 90 marks of syllabus to sit 60.
3. Pick sections that overlap. Biochemistry shares ground with Zoology's molecular biology and parts of Microbiology; Food Technology's food chemistry overlaps with XL0.
4. Answer every MSQ and NAT. No penalty. A wrong 1-mark MCQ costs 1/3 and a 2-mark one 2/3.
5. Don't give up General Aptitude. 15 marks, and no biology needed.
6. Work from the section PDFs. They're detailed, and a summary will mislead you on depth.
7. Solve the past XL papers. IIT Madras posts papers back to 2007 and keys for recent years on its downloads page.
8. Think before adding CY. XL pairs only with BT, CY and EY. CY looks natural given XL0, but it's a full postgraduate chemistry paper and the fee doubles.

• GATE 2027, IIT Madras
• XL syllabus (PDF)
• All papers and syllabi
• Previous papers (2007 to 2026) and answer keys (2021 to 2026)
• Question paper pattern
• Two-paper combinations
• Eligibility
• Application fees
• Important dates

Which IIT is conducting GATE 2027?

IIT Madras. The organising institute rotates each year among IISc Bangalore and the seven older IITs.

Is chemistry compulsory in the Life Sciences paper?

Yes. XL0 Chemistry carries 25 marks for every XL candidate.

How many optional sections do I choose?

Two, from XL1 Biochemistry, XL2 Botany, XL3 Microbiology, XL4 Zoology and XL5 Food Technology, at 30 marks each.

Is there an age limit or a limit on attempts?

Neither, and your degree doesn't have to match the paper.

Which questions carry negative marking?

Only MCQs: 1/3 for a wrong 1-mark question, 2/3 for a wrong 2-mark one. MSQ and NAT have no penalty.

Can I sit two papers?

Yes. With XL first, the second can be BT, CY or EY. The fee doubles.

Are previous XL papers available?

Yes, on the GATE 2027 downloads page, with answer keys for recent years.

How long is a GATE score valid?

Three years from the result.

Does qualifying GATE get me a seat?

No. It gets you a scorecard. Admission runs through COAP or CCMT, each a separate registration, and seats go at scores well above the qualifying mark.

Can third-year students apply?

Yes, from the 3rd year of any undergraduate degree.