GATE Life Science Syllabus 2027
The GATE Life Science
Syllabus is an essential resource for candidates preparing under the XL paper
code in the Graduate Aptitude Test in Engineering conducted by the Indian
Institute of Technology on behalf of the Indian Institute of Science and other
IITs. If you are planning to appear for GATE 2027 in Life Sciences,
understanding the GATE exam syllabus for Life Science is the first and most
important step. Along with the syllabus, staying updated about the GATE 2027
exam date is equally important for planning your preparation timeline
effectively. This guide provides a complete breakdown of the GATE XL Life
Science syllabus 2027, including section-wise topics, paper pattern,
preparation strategy, key updates regarding the GATE 2027 exam date, and details
about the GATE Life Science syllabus PDF download. GATE Life Science Syllabus
2027 (Chapter Wise) Below is the detailed syllabus for GATE Life Science under
the XL paper.
Chemistry
Section 1:
Atomic Structure and Periodicity: Planck’s
quantum theory, wave particle duality, uncertainty principle, comparison
between Bohr’s model and quantum mechanical model of hydrogen atom, electronic
configuration of atoms and ions. Hund’s rule and Pauli’s exclusion principle. Periodic
table and periodic properties: ionization energy, electron affinity,
electronegativity and atomic size.
Section 2:
Structure and Bonding: Ionic
and covalent bonding, MO and VB approaches for diatomic molecules, VSEPR theory
and shape of molecules, hybridization, resonance, dipole moment, structure
parameters such as bond length, bond angle and bond energy, hydrogen bonding
and van der Waals interactions. Ionic solids, ionic radii and lattice energy
(Born‐Haber cycle). HSAB principle.
Section 3: s,
p and d Block Elements: Oxides,
halides and hydrides of alkali, alkaline earth metals, B, Al, Si, N, P, and S.
General characteristics of 3d elements. Coordination complexes: valence bond
and crystal field theory, color, geometry, magnetic properties and isomerism.
Section 4:
Chemical Equilibria: Osmotic pressure,
elevation of boiling point and depression of freezing point, ionic equilibria in
solution, solubility product, common ion effect, hydrolysis of salts, pH,
buffer and their applications. Equilibrium constants (Kc, Kp and Kx) for
homogeneous reactions.
Section 5:
Electrochemistry: Conductance,
Kohlrausch law, cell potentials, EMF, Nernst equation, thermodynamic aspects and
their applications.
Section 6:
Reaction Kinetics: Rate constant, order
of reaction, molecularity, activation energy, zero, first and second order kinetics,
catalysis and elementary enzyme reactions. Reversible and irreversible
inhibition of enzymes.
Section 7:
Thermodynamics: Qualitative treatment
of state and path functions, First law, reversible and irreversible processes,
internal energy, enthalpy, Kirchoff equation, heat of reaction, Hess’s law,
heat of formation. Second law, entropy and free energy. Gibbs‐Helmholtz
equation, free energy change and spontaneity, Free energy changes from
equilibrium constant.
Section 8:
Structure-Reactivity: Correlations and
Organic Reaction Mechanisms: Acids and bases, electronic and steric effects,
Stereochemistry, optical and geometrical isomerism, tautomerism, conformers and
concept of aromaticity. Elementary treatment of SN1, SN2, E1, E2 and radical
reactions, Hoffmann/Saytzeff rules, addition reactions, Markownikoff rule and
Kharasch effect. Elementary hydroboration reactions. Grignard’s reagents and
their uses. Aromatic electrophilic substitutions, orientation effect as
exemplified by various functional groups. Identification of common 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.
BIOCHEMISTRY
Section 1: Organization of life; Importance of water;
Structure and function of biomolecules: Amino acids, Carbohydrates, Lipids,
Proteins and Nucleic acids; Protein structure, folding/misfolding and function;
Myoglobin, Haemoglobin, Lysozyme, Ribonuclease A, Carboxypeptidase and Chymotrypsin.
Section 2: Enzyme kinetics, regulation and inhibition;
Vitamins and Coenzymes; Bioenergetics and metabolism; Generation and
utilization of ATP; Metabolic pathways and their 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: ion
exchange, size exclusion and affinity chromatography, centrifugation;
Characterization of biomolecules by electrophoresis; DNA- protein and protein–
protein interactions; UV-visible and fluorescence spectroscopy; Mass
spectrometry.
Section 4: Cell structure and organelles; Biological
membranes; Action potential; Transport across membranes; Membrane assembly and
Protein targeting; Signal transduction; Receptor-ligand interaction; Hormones
and neurotransmitters
Section 5: DNA replication, transcription and translation;
DNA damage and repair; Biochemical regulation of gene expression; Recombinant
DNA technology and applications: PCR, site directed mutagenesis,
DNA-microarray; Next generation sequencing; Gene silencing and editing.
Section 6:
Immune system: Innate and adaptive;
Cell of the immune system; Active and passive immunity; Complement system;
Antibody structure, function and diversity; B cell and T Cell receptors; B cell
and T cell activation; Major histocompatibility complex; Immunological techniques:
Immuno diffusion, immune-electrophoresis, RIA and ELISA, flow cytometry; monoclonal
antibodies and their applications.
BOTANY
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 and herbaria
in India.
Section 2:
Plant Anatomy: Anatomy of root, stem
and leaves, floral organs, embryo and young seedlings, Primary and secondary
meristems, stellar organisation, vascular system and their ontogeny, xylem and phloem
structure, secondary growth in plants and wood anatomy, plant cell structure
and differences from animal cells
Section 3: Plant development; cell and tissue
morphogenesis 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
fertilization, 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, 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: glycolysis, TCA cycle and electron transport
chain. 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 (proteins, carbohydrates,
lipids, nucleic acid), enzyme kinetics. Structure and biosynthesis of major
plant secondary metabolites (alkaloids, terpenes, phenylpropanoids,
flavonoids). Biosynthesis, mechanism of action and physiological effects of
auxin, cytokinin, gibberellic acids, brassino steroid, 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 and repair, chromosomal aberrations
(numerical: euploidy and aneuploidy and structural: deletion, duplication,
inversion, translocation), transposons. Model organisms for functional genetics
and genomics; Introduction to transcriptomics, proteomics and metabolomics.
Section 6: Plant Breeding, Genetic Modification, Genome
Editing Principles, methods – selection, hybridization, heterosis; male
sterility, genetic maps and molecular markers, embryo rescue, haploid and
doubled haploids, plant tissue culture: micropropagation, embryo culture and in
vitro regeneration, somatic embryogenesis, artificial seed, cryopreservation,
soma clonal variation, somatic cell hybridization, marker-assisted selection,
gene transfer methods viz. direct and vector-mediated, generation of transgenic
plants; Introduction to genome editing: CRISPR/Cas9, Cre-Lox system to generate
chimeras; plastid transformation; chemical mutagenesis.
Section 7:
Economic and applied: Botany A general
account of economically and medicinally important plants- cereals, pulses,
plant syielding fibers, timber, sugar, beverages, oils, rubber, pigments, dyes,
gums, drugs and narcotics. 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 and its
regulation eg. Bt cotton, Bt-brinjal golden rice etc.
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 (chemical and biological) mechanism(s)
of pathogenesis, resistance: basal, systemic, induced systemic resistance,
gene-for-gene concept. Molecular detection of pathogens; plant-microbe
interactions: symbionts and mycorrhiza, pathogens and pests. Signaling pathways
in plant defence response; salicylic acid (SA) and jasmonic acid (JA) in
plant-pathogen and plant-herbivore interaction, necrosis; host-parasitic plant
interaction (such as Cuscuta).
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.
MICROBIOLOGY
Section 1:
Historical Perspective: Discovery
of microbial world; Landmark discoveries relevant to the field of microbiology;
Controversy over spontaneous generation; Role of microorganisms in
transformation of organic matter and in the causation 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; PCR, real-time PCR for quantitation of microbes; Next
generation sequencing technologies in microbiology.
Section 3:
Microbial Taxonomy and Diversity Bacteria, Archea and their
broad classification; Eukaryotic microbes: Yeasts, molds and protozoa; Viruses
and their classification; Molecular approaches to microbial taxonomy and phylogeny.
Section 4:
Prokaryotic Cells: Structure and
Function, 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 and 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 Micro-organisms: Disinfection
and sterilisation: principles, methods and assessment of efficacy.
Section 7:
Microbial Metabolism: Energetics: redox
reactions and electron carriers; Electron transport and oxidative phosphorylation;
An overview of metabolism; Glycolysis; Pentose-phosphate pathway; Entner-Doudoroff
pathway; Glyoxalate 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 defence of host; Antigens and antibodies; Humoral and cell-mediated
immunity; Vaccines; passive immunisation; Immune deficiency; Human diseases caused
by viruses, bacteria, and pathogenic fungi.
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: repression and
induction; 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 concept of metagenomics and
metatranscriptomics
ZOOLOGY
Section 1:
Animal Diversity: Distribution,
systematics and classification of animals, phylogenetic relationships (based on
classical and molecular phylogenetic tools).
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 and 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
and their structure and function, cell cycle, cell division, chromosomes and chromatin
structure.
Section 6:
Gene expression in Eukaryotes: Eukaryotic genome
organization and regulation of gene expression, transposable elements.
Section 7:
Animal Anatomy and Physiology: Comparative
physiology, the respiratory system, Muscular system, circulatory system, digestive
system, the nervous system, the excretory system, the endocrine system, the reproductive
system, the 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 Behaviour: Type of behaviours,
courtship, mating and territoriality, instinct, learning and memory, social behaviour
across the animal taxa, communication, pheromones, evolution of behaviour in
animals.
FOOD TECHNOLOGY
Section 1:
Food Chemistry and Nutrition: Carbohydrates:
structure and functional properties of mono-, oligo-, & poly-saccharides,
including starch, cellulose, pectic substances and dietary fiber;
gelatinization and 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, chlorophyll,
anthocyanins, tannins and myoglobin. Food flavours: terpenes, esters,
aldehydes, ketones, and quinines. 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; and 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 pack aging 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: pasteurization and sterilization, cream, butter, ghee,
ice- cream, cheese and milk powder. Processing of animal products: drying,
canning, and freezing of fish and meat; production of egg powder. 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 a pipe, Reynolds number. Heat transfer: heat
transfer by conduction, convection, radiation, heat exchangers. Mass transfer:
molecular diffusion andFlick'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 ope
GATE 2027 XL Syllabus – Important Highlights
|
Particulars |
Details |
|
Paper
Code |
XL |
|
Total
Marks |
100 |
|
Sections |
GA
+ Chemistry + 2 Optional Sections |
|
Mode
of Exam |
Computer-Based
Test |
|
Negative
Marking |
Applicable |
The GATE XL syllabus 2027 is
ideal for candidates from Life Sciences, Biotechnology, Microbiology,
Biochemistry, Botany, Zoology, and related backgrounds.
Overview of GATE XL Life
Science Paper
The GATE XL syllabus is
structured differently from other engineering papers. It includes:
- General Aptitude (Compulsory – 15 Marks)
- Chemistry (Compulsory – 25 Marks)
- Two Optional Life Science Sections (Each
30 Marks)
Total Marks: 100
Duration: 3 Hours
Candidates must carefully
select two optional sections based on their academic background.
Candidates looking for the
GATE Life Science syllabus PDF download or GATE XL 2027 syllabus PDF download
should check the official GATE portal once the notification is released.
The official GATE 2027 Life
Science syllabus PDF will contain:
- Detailed topic-wise weightage
- Updated paper pattern
- Official instructions
- Marking scheme
It is highly recommended to
download and keep the latest GATE Life Science syllabus PDF for structured
preparation.
How To Prepare As Per GATE
Life Sciences Syllabus?
Here is a structured
approach:
Step 1: Download
the Official Syllabus : Start with the latest GATE Life Science
syllabus 2027 and mark important topics.
Step 2: Choose
Optional Sections Wisely : Select sections aligned with your
graduation subject.
Step 3: Focus on Chemistry
: Chemistry is compulsory and scoring if prepared
systematically.
Step 4: Solve Previous
Year Papers : Analyze trends based on the GATE syllabus
Life Science.
Step 5: Revise with
Conceptual Clarity : The GATE exam tests conceptual
understanding more than rote learning.
Why Understanding the GATE
Exam Syllabus for Life Science is Important?
- Helps in time management
- Prevents irrelevant preparation
- Clarifies optional subject selection
- Improves scoring strategy
- Aligns preparation with exam pattern
A clear understanding of the
Life Science GATE syllabus ensures focused preparation and better results.
GATE Life Science Exam
Pattern 2027
Understanding the GATE
Life Science exam pattern is as crucial as knowing the GATE XL syllabus
2027.
|
Section |
Marks |
Question
Type |
|
General
Aptitude |
15 |
MCQ,
MSQ, NAT |
|
Chemistry
(P) |
25 |
MCQ,
MSQ, NAT |
|
Optional
Sections (Q–U) |
60 |
MCQ,
MSQ, NAT |
|
Total |
100
Marks |
3
Hours |
GATE Life Science Science Cut-Off
The GATE 2026
examination is being conducted by the Indian Institute of Technology. Students
preparing for GATE should thoroughly check the last year's GATE Life Science
cutoff to understand the required score to qualify. The previous year’s GATE
Life Science cut-off was declared by the Indian Institute of Science. To review
the previous year's cut-off for GATE Life Science, students can visit the
official website at GATE 2024 IISc Bengaluru. The institute announced the GATE
Life Science cut-off based on different categories, including General, OBC/EWS,
and SC/ST/PwD. By analyzing the GATE Life Science previous year cut-off,
aspirants can better understand the exam’s difficulty level and set a clear
target score. Checking the 2024 cut-off marks will help you gauge competition
and set realistic preparation goals for 2026. Additionally, students can review
the GATE Life Science Syllabus to ensure comprehensive preparation.
Life science
cut-off 2014-2025
|
Year |
General |
OBC |
SC/ST/PwD |
|
2025 |
31.3 |
28.1 |
20.8 |
|
2024 |
29.3 |
26.3 |
19.5 |
|
2023 |
42.6 |
38.3 |
28.4 |
|
2022 |
33.34 |
30.5 |
20.5 |
|
2021 |
35.5 |
32.1 |
23.8 |
|
2020 |
42.2 |
37.9 |
28.1 |
|
2019 |
37.1 |
33.4 |
24.7 |
|
2018 |
49.3 |
44.3 |
32.8 |
|
2017 |
34.33 |
29.8 |
25.5 |
|
2016 |
32 |
28.5 |
25.6 |
|
2015 |
38.59 |
34.54 |
25.72 |
|
2014 |
42.89 |
38.6 |
28.59 |
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