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GATE 2026 Life Sciences Syllabus, Exam Pattern, Marking Scheme, Preparation Tips & Books

OverviewXL Syllabus▾Application Process▾Preparation Tips▾Result▾Question Papers▾Cut OffCollege PredictorNewsQ&A

Content Writer | Updated On - Jul 29, 2025

IISc Bangalore will officially releasethe syllabus for Life Science (XL) for the year 2026 on its website gate2026.iisc.ac.in. Life Science comprises various subjects which are named XL - P to U, where the letters from P-U represent, P - Chemistry, Q - Biochemistry, R - Botany, S- Microbiology, T - Zoology, and U - Food technology. These subjects have a weightage of 85 % in total, while the remaining 15% is constituted by the General Aptitude section.

General aptitude and XL [P] sections are compulsory for all the candidates appearing for GATE 2026 XL, while candidates can opt for any 2 subjects from the remaining subjects i.e. XL [Q] to XL [U].
Each of the optional sections of the XL paper (Sections Q through U) contains 19 questions carrying a total of 30 marks: 8 questions carrying 1 mark each and 11 questions carrying 2 marks each.
There will be negative marking of MCQs which include -⅓ for 1 mark questions and -⅔ for 2 mark questions.
Some of the best books to prepare for GATE Lifescience include Microbiology (5th edition) by Michael Pelczar, Noel R. Kreig, Prescott's Microbiology by Christopher J. Woolverton, Linda M. Sherwood, Smart Studies Series for Microbiology by Ankit Gupta, Prafulla Songara, Biochemistry by Satyanarayana.

Table of Content

GATE Life Sciences Syllabus for 2026
GATE 2026 Life Sciences Exam Pattern

GATE Life Science 2026: Marking Scheme

GATE Life Science 2026: Important Books

GATE Life Science Previous Year Papers

GATE 2026: Preparation Tips

FAQs

GATE Life Sciences Syllabus for 2026

GATE 2026 Chemistry Syllabus [XL - P]
Section		Subtopics
Section 1: Atomic Structure and Periodicity		Planck’s quantum theory Wave particle theory Uncertainty principle Quantum mechanical model of hydrogen atom Electronic configuration Periodic table and properties Ionisation energy Electron affinity Electronegativity and atomic size
Section 2: Structure and Bonding		Covalent and ionic bond MO and VB approach for diatomic molecules VSEPR theory Shape of molecules Hybridisation Resonance Dipole moment Structure parameters Vander Waals interaction Ionic solids Ionic radii Lattice energy - Born-Haber cycle HSAB Principle
Section 3: s, p, and d block elements		Oxides, halides, and hydrides of alkali Alkaline earth metals General characteristics of 3d elements Coordination complexes- valence bond and crystal field theory, color, geometry, magnetic properties, and isomerism
Section 4: Chemical equilibria		Colligative properties of solutions Ionic equilibria in solution Solubility product Common ion effect Hydrolysis of salts pH Equilibrium constants - Kc, Kp, and Kx. Homogeneous reactions
Section 5: Electrochemistry		Conductance Kohlrausch law Cell potentials Emf Nernst equation Galvanic cells Thermodynamic aspects and their applications
Section 6: Reaction kinetics		Rate constant Order of reaction Molecularity Activation energy Zero, first, and second order kinetics Catalysis Elementary enzyme reactions
Section 7: Thermodynamics		First law reversible and irreversible processes internal energy enthalpy Kirchoff equation heat of reaction Hess’s law heat of formation Second law free energy and work function GibbsâHelmholtz equation ClausiusâClapeyron equation free energy change equilibrium constant and Trouton’s rule Third law of thermodynamics
Section 8: Structure reactivity correlations and organic reaction mechanisms		Acids and bases electronic and steric effects optical and geometrical isomerism Tautomerism Conformers and concept of aromaticity Elementary treatment of SN1, SN2, E1 and E2 reactions Hoffmann and Saytzeff rules Addition reactions Markownikoff rule and Kharash effect Aromatic electrophilic substitutions Orientation effect DielsâAlder, Wittig and hydroboration reactions Identification of functional groups by chemical tests
Section 9: Chemistry of Biomolecules		Amino acids Proteins, nucleic acids and nucleotides Peptide sequencing by chemical and enzymatic proteolytic methods DNA sequencing by chemical and enzymatic methods Carbohydrates (upto hexoses only) Lipids (triglycerides only) Principles of biomolecule Purification-Ion exchange and gel filtration chromatography Identification of these biomolecules and Beer-Lambert’s law
GATE 2026 XL - Q Syllabus
Section 1		Organisation of life Importance of water Structure and function of biomolecules: Amino acids, Carbohydrates, Lipids, Proteins and Nucleic acids Protein structure, folding and function: Myoglobin, Haemoglobin, Lysozyme, Ribonuclease A, Carboxypeptidase and Chymotrypsin
Section 2		Enzyme kinetics including regulation and inhibition Vitamins and Coenzymes Metabolism and bioenergetics Generation and utilisation of ATP Metabolic pathways including the regulation: glycolysis, TCA cycle, pentose phosphate pathway, oxidative phosphorylation, gluconeogenesis, glycogen and fatty acid metabolism Metabolism of Nitrogen containing compounds: nitrogen fixation, amino acids and nucleotides Photosynthesis Calvin cycle
Section 3		Biochemical separation techniques Characterization of biomolecules Mass spectrometry
Section 4		Cell structure and organelles Biological membranes Transport across membranes Signal transduction Hormones Neurotransmitters
Section 5		DNA replication, transcription and translation Biochemical regulation of gene expression DNA technology (Recombinant) and applications PCR, site directed mutagenesis and DNA-microarray
Section 6		Immune system: Active and passive immunity Complement system Antibody structure, function and diversity Cells of the immune system T and B cell activation Major histocompatibility complex T cell receptor Immunological techniques: Immunodiffusion, immunoelectrophoresis, RIA and ELISA
GATE 2026 Botany [XL - R] Syllabus
Section 1: Plant Systematics		Botanical nomenclature history of plant taxonomy diversity and classification of plants APG system of plant classification phylogenetics and cladistics molecular taxonomy and DNA barcoding Centres for plant taxonomy
Section 2: Plant Anatomy		Anatomy of root, stem and leaves floral organs embryo and young seedlings Primary and secondary meristems stellar organization vascular system and their ontogeny xylem and phloem structure secondary growth in plants and wood anatomy plant cell structure differences from animal cells
Section 3: Plant development		Life cycle of an angiosperm development of male and female gametophyte cell fate determination and tissue patterning spacing mechanisms in trichomes and stomata Embryogenesis organization and function of shoot and root apical meristems Transition to flowering: photoperiodism and vernalization ABC model of floral organ patterning pollen germination double fertilisation seed development Xylem and phloem cell differentiation Photomorphogenesis phytochrome, cryptochrome, phototropin. Role of auxin, cytokinin, gibberellins, and brassinosteroids on plant development
Section 4: Plant physiology and biochemistry		Plant water relations mechanisms of uptake and transport of water, ions, solutes from soil to plants Apoplastic and symplastic transport mechanisms Mechanism of stomatal movements nitrogen metabolism Photosynthesis C3, C4 and CAM cycles Photorespiration Respiration Plant responses and mechanisms of abiotic stresses including drought, salinity, freezing and heat stress, metal toxicity role of abscisic acid in abiotic stresses Structure and function of biomolecules enzymes. Structure and biosynthesis of major plant secondary metabolites Biosynthesis mechanism of action Physiological effects of auxin, cytokinin, gibberellic acids, brassinosteroid, ethylene, strigolactone, abscisic acid, salicylic and jasmonic acid Senescence and programmed cell death
Section 5: Genetics and Genomics		Cell cycle and cell division Principles of Mendelian inheritance, linkage, recombination, genetic mapping extra chromosomal inheritance Introduction to epigenetics gene silencing: transgene silencing, post transcriptional gene silencing, miRNA and siRNA Evolution and organization of eukaryotic genome structure gene expression gene mutation chromosomal aberrations Transposons Model organisms for functional genetics and genomics Introduction to transcriptomics proteomics and metabolomics
Section 6: Plant Breeding, genetic modification, and genome editing		Principles, methods – selection, hybridization, heterosis Male sterility genetic maps molecular markers embryo rescue haploid plant tissue culture: micropropagation, embryo culture and in vitro regeneration somatic embryogenesis cryopreservation somaclonal variation somatic cell hybridization marker-assisted selection gene transfer methods generation of transgenic plants Introduction to genome editing: CRISPR/Cas9, Cre-Lox system to generate chimaeras plastid transformation chemical mutagenesis
Section 7: Economy and applied Botany		A general account of economically and medicinally important plants Economic importance of algae, fungi, lichen and bacteria Major Indian cash crops Effect of industrialization on agricultural botany such as plastic on fiber economy Genetically modified crops
Section 8: Plant Pathology		Nature and classification of plant diseases diseases of important crops caused by fungi, bacteria, nematodes and viruses, and their control measures Mechanism of pathogenesis, resistance Molecular detection of pathogens plant-microbe interactions: symbionts and mycorrhiza, pathogens and pests Signalling pathways in plant defence response salicylic acid (SA) and jasmonic acid (JA) Host-parasitic plant interaction
Section 9: Ecology and Environment		Ecosystems – types, dynamics, degradation, biogeochemical cycles, ecological succession food webs and energy flow through ecosystem vegetation types of the world, Indian vegetation types and biogeographical zones climate and flora endemism pollution and global climate change speciation and extinction biodiversity and conservation strategies ecological hotspots Afforestation Habitat restoration plant interactions with other organisms: epiphytes, parasites and endophytes
GATE 2026 Microbiology [XL - S] Syllabus
Section 1: Historical Perspective		Discovery of microbial world Landmark discoveries related to microbiology Controversy over spontaneous generation Role of microorganisms in transformation of organic matter and in the causes of diseases
Section 2: Methods in Microbiology		Pure culture techniques Principles of microbial nutrition Enrichment culture techniques for isolation of microorganisms Antigen and antibody detection methods for microbial diagnosis Light-phase contrast, fluorescence- and electron-microscopy real-time PCR for quantified results sequencing technologies of the next generation
Section 3: Microbial taxonomy and diversity		Bacteria, Archaea and their broad classification Eukaryotic microbes Viruses and their classification Molecular approaches to microbial taxonomy and phylogeny
Section 4: Structure and function of Prokaryotic cells		Prokaryotic Cells: cell walls, cell membranes and their biosynthesis mechanisms of solute transport across membranes Flagella and Pili Capsules Cell inclusions like endospores and gas vesicles Bacterial locomotion including positive negative chemotaxis
Section 5: Microbial Growth		Definition of growth Growth curve Mathematical expression of exponential growth phase Measurement of growth and growth yields Synchronous growth Continuous culture Effect of environmental factors on growth Bacterial biofilm and biofouling
Section 6: Control of Microorganisms		Disinfection Sterilisation
Section 7: Microbial Metabolism		Energetics: redox reactions and electron carriers Electron transport and oxidative phosphorylation Glycolysis Pentose-phosphate pathway Entner-Doudoroff pathway Glyoxylate pathway The citric acid cycle Fermentation Aerobic and anaerobic respiration Chemolithotrophy Photosynthesis Calvin cycle Biosynthetic pathway for fatty acids synthesis Common regulatory mechanisms in synthesis of amino acids Regulation of major metabolic pathways
Section 8: Microbial Diseases and Host Pathogen interaction		Normal microbiota Classification of infectious diseases Reservoirs of infection Nosocomial infection Opportunistic infections Emerging infectious diseases Mechanism of microbial pathogenicity Nonspecific defense of host Antigens and antibodies Humoral and cell mediated immunity Vaccines passive immunisation Immune deficiency Human diseases caused by pathogenic fungi, bacteria, and viruses
Section 9: Chemotherapy/ Antibiotics		General characteristics of antimicrobial drugs Antibiotics: Classification Molecular mechanism of mode of action and resistance Antifungal and antiviral drugs
Section 10: Microbial Genetics		Types of mutation UV and chemical mutagens Selection of mutants Ames test for mutagenesis Bacterial genetic system: transformation, conjugation, transduction, recombination, plasmids, transposons DNA repair Regulation of gene expression Operon model Bacterial genome with special reference to E.coli Phage λ and its life cycle RNA Mutation in virus genomes, virus recombination and reassortment Basic concept of microbial genomics
Section 11: Microbial Ecology		Microbial interactions Carbon, sulphur and nitrogen cycles Soil microorganisms associated with vascular plants Bioremediation Uncultivable microorganisms basic concepts of metagenomics and metatranscriptomics
GATE 2026 Zoology [XL - T] Syllabus
Section 1: Animal diversity		Distribution systematics and classification of animals phylogenetic relationships
Section 2: Evolution		Origin and history of life on earth Theories of evolution Natural selection Adaptation Speciation
Section 3: Genetics		Basic Principles of inheritance Molecular basis of heredity Sex determination and sex-linked characteristics Cytoplasmic inheritance, linkage, recombination and mapping of genes in eukaryotes Population genetics Genetic disorders Roles of model organisms in understanding genetic principles
Section 4: Biochemistry and Molecular Biology		Nucleic acids Proteins Lipids Carbohydrates Replication Transcription and translation Krebs cycle Glycolysis Enzyme catalysis Hormones and their actions Roles of vitamins and minerals
Section 5: Cell Biology		Basic principles of cellular microscopy structure of cell cytoskeletal organization cellular organelles: their structure and function cell cycle cell division chromosomes & chromatin structure
Section 6: Gene expression in Eukaryotes		Eukaryotic genome organization Regulation of gene expression Transposable elements
Section 7: Animal Anatomy and Physiology		Comparative physiology the respiratory system Muscular system circulatory system digestive system nervous system excretory system endocrine system reproductive system skeletal system
Section 8: Parasitology and Immunology		Nature of parasite Host-parasite relation Protozoan and helminthic parasites, the immune response, cellular and humoral immune response
Section 9: Development Biology		Gametogenesis Embryonic development Cellular differentiation Organogenesis Metamorphosis Model organisms used in developmental biology Genetic and molecular basis of development Stem cells
Section 10: Ecology		The ecosystem Animal distribution Ecological niche and its contribution to ecological diversity The food chain Population dynamics Species diversity Zoogeography Biogeochemical cycles Conservation biology Ecotoxicology
Section 11: Animal Behavior		Type of behaviours Courtship Mating Territoriality Instinct Learning Memory Social behaviour across the animal taxa Communication Pheromones Evolution of behavior in animals
GATE 2026 Food Technology [XL - U] Syllabus
Section 1: Food Chemistry and Nutrition		Carbohydrates: structure and functional properties of mono-, oligo-, & poly- saccharides including starch Cellulose Pectic substances Dietary fibre Gelatinization Retrogradation of starch Proteins: classification and structure of proteins in food, biochemical changes in post mortem and tenderization of muscles Lipids: classification and structure of lipids, rancidity, polymerization and polymorphism Pigments: carotenoids, chlorophylls, anthocyanins, tannins and myoglobin Food flavours: terpenes, esters, aldehydes, ketones and quinones Enzymes: specificity, simple and inhibition kinetics, coenzymes, enzymatic and non- enzymatic browning Nutrition: balanced diet, essential amino acids and essential fatty acids, protein efficiency ratio, water soluble and fat soluble vitamins, role of minerals in nutrition, co-factors, anti-nutrients, nutraceuticals, nutrient deficiency diseases Chemical and biochemical changes: changes occur in foods during different processing
Section 2: Food microbiology		Characteristics of microorganisms: morphology of bacteria, yeast, mold and actinomycetes, spores and vegetative cells, gram-staining Microbial growth: growth and death kinetics, serial dilution technique Food spoilage: spoilage microorganisms in different food products including milk, fish, meat, egg, cereals and their products Toxins from microbes: pathogens and non-pathogens including Staphylococcus, Salmonella, Shebelle, Escherichia, Bacillus, Clostridium, and Aspergillus genera Fermented foods and beverages: curd, yoghurt, cheese, pickles, soya-sauce, sauerkraut, idly, dose, vinegar, alcoholic beverages and sausage
Section 3: Food Products Technology		Processing principles: thermal processing, chilling, freezing, dehydration, addition of preservatives and food additives, irradiation, fermentation, hurdle technology, intermediate moisture foods Food packaging and storage: packaging materials, aseptic packaging, controlled and modified atmosphere storage Cereal processing and products: milling of rice, wheat, and maize, parboiling of paddy, bread, biscuits, extruded products and ready to eat breakfast cereals Oil processing: expelling, solvent extraction, refining and hydrogenation Fruits and vegetables processing: extraction, clarification, concentration and packaging of fruit juice, jam, jelly, marmalade, squash, candies, tomato sauce, ketchup, and puree, potato chips, pickles Plantation crops processing and products: tea, coffee, cocoa, spice, extraction of essential oils and oleoresins from spices Milk and milk products processing: pasteurisation and sterilization, cream, butter, ghee, ice- cream, cheese and milk powder Processing of animal products: drying, canning, and freezing of fish and meat Waste utilization: pectin from fruit astes, uses of by-products from rice milling Food standards and quality maintenance: FPO, PFA, A-Mark, ISI, HACCP, food plant sanitation and cleaning in place (CIP)
Section 4: Food Engineering		Mass and energy balance: Momentum transfer: Flow rate and pressure drop relationships for Newtonian fluids flowing through pipe, Reynolds number Heat transfer: heat transfer by conduction, convection, radiation, heat exchangers Mass transfer: molecular diffusion and Flick’s law, conduction and convective mass transfer, permeability through single and multilayer films Mechanical operations: size reduction of solids, high pressure homogenization, filtration, centrifugation, settling, sieving, mixing & agitation of liquid Thermal operations: thermal sterilization, evaporation of liquid foods, hot air drying of solids, spray and freeze-drying, freezing and crystallization Mass transfer operations: psychometric, humidification and dehumidification operations

GATE 2026 Life Sciences Exam Pattern

Candidates appearing for GATE 2026 Life Sciences paper should know the paper pattern and the marking system to decide the number of questions to be attempted in the exam.

Particulars	Details
Exam duration	3 hours
Exam mode	Online
Total number of questions	65
Total marks	100
Total questions - section wise	General aptitude - 10 Chemistry - 15 Optional subjects - 40

GATE Life Science 2026: Marking Scheme

Here, the marking scheme for GATE Life Science 2026 has been mentioned for better understanding:

Particulars	Details
Marking Scheme - MCQs	+1 for every 1 mark question attempted correctly +2 for every 2 marks question attempted correctly -⅓ for every 1 mark question answered incorrectly -⅔ for every 2 mark question answered incorrectly
Marking Scheme - NAT	No negative marking

GATE Life Science 2026: Important Books

Candidates can refer to these important books for better preparation for GATE 2026 Life Science Paper, however, the resources are not limited and candidates can refer to other books as per their convenience:

Microbiology (5th edition) by Michael Pelczar, Noel R. Kreig
Presscott’s Microbiology by Christopher J. Woolverton, Linda M. Sherwood
Smart Studies Series for microbiology by Ankit Gupta, Prafulla Songara
Biochemistry by Satyanarayana

GATE Life Science Previous Year Papers

Previous Year’s papers are one of the best ways to check one’s preparation level. Candidates can refer to these papers to analyze the types of questions being asked in the GATE exam and prepare accordingly.

Year	Question Paper	Answer Key
2021	Download	Download
2020	Download	Download
2019	Download	Download
2018	Download	Download
2017	Download	Download

GATE 2026: Preparation Tips

Make short notes of all the important points and formulas for instant references.
Make sure to go through the complete GATE 2026 Metallurgy syllabus at least once.
Refer to the Sample Papers / Previous year papers provided by various sources.
Make sure to avoid last-moment hustles.
Solve at least 2 sample / mock papers every week at least for a month before the exam.
Make sure to revise the sections that you are strong at.
Try to solve the sample papers with a timer as per the exam conditions.
Get sound sleep of at least 7 - 8 hours the day before the examination.
Have a regular and healthy diet.
Get some refreshments for staying calm, such as a good walk, run, etc

FAQs

Ques. What are some good reference books for GATE Life Sciences 2026?

Ans. Candidates can refer to the following important reference books to prepare strategically for GATE 2026 Life Sciences:

Biochemistry by Satyanarayana
Damodaran Geetha’s Practical Biochemistry
Principles and Techniques of the Biochemistry by Wilson and Walker

Ques. What is the total number of questions asked in the optional sections for GATE Life Sciences?

Ans. Candidates have to opt for any 2 sections from the subjects from Q to U and a total of 40 questions are asked in these sections.

Ques. Are the questions repeated in the GATE Life Sciences Paper?

Ans. GATE is known for the unique questions every time. Question types can be similar in some cases, however, it is very rare to find an identical question in the GATE exam.

Ques. Where can a candidate download the previous year's question papers?

Ans. Candidates can download the previous year's question papers from the official website of GATE. Also, the section for the previous year's papers in the article above provides links for the previous year's question papers.

Ques: Will there be a negative marking in the GATE 2026 Life Science paper?

Ans: Yes, there will be negative markings for MCQ-type questions only and not for NAT-type questions. For every 1 mark question attempted incorrectly, -⅓ marks will be deducted, and for every 2 mark questions attempted incorrectly, -⅔ marks will be deducted.

*The article might have information for the previous academic years, please refer the official website of the exam.

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GATE 2026 Life Sciences Syllabus, Exam Pattern, Marking Scheme, Preparation Tips & Books

GATE Life Sciences Syllabus for 2026

GATE 2026 Life Sciences Exam Pattern

GATE Life Science 2026: Marking Scheme

GATE Life Science 2026: Important Books

GATE Life Science Previous Year Papers

GATE 2026: Preparation Tips

FAQs

Ask your question

Answered Questions

What are the eligibility criteria for different engineering programs?

Zollege Team

What is the fee structure for b.tech computer science and engineering at VIT University?

Zollege Team

What interdisciplinary research opportunities are available for graduate students at PRSU?

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