NEET 2026 Re-Exam Date Announcement: Expected Schedule, New Rules & What Every Student Must Know<\/a><\/li>\n<\/ul>\n\n\n\nBOTANY \u2014 High-Weightage Chapters<\/h2>\n\n\n\n1. Molecular Basis of Inheritance (Class 12) \u2b50\u2b50\u2b50<\/h3>\n\n\n\n
This is consistently one of the highest-scoring chapters in the entire Biology section, contributing approximately 14\u201316% of Biology marks<\/strong> in recent NEET papers. If you are serious about Re-NEET 2026 biology preparation, this chapter alone deserves 3\u20134 dedicated days.<\/p>\n\n\n\nWhat to focus on:<\/strong><\/p>\n\n\n\n\n- Structure of DNA and RNA (differences, types of RNA)<\/li>\n\n\n\n
- Replication \u2014 semi-conservative model, enzymes involved<\/li>\n\n\n\n
- Transcription in prokaryotes vs eukaryotes<\/li>\n\n\n\n
- Translation \u2014 codons, anticodons, ribosomes<\/li>\n\n\n\n
- Regulation of gene expression \u2014 Lac operon (diagram is essential)<\/li>\n\n\n\n
- Human Genome Project \u2014 key facts and outcomes<\/li>\n\n\n\n
- DNA fingerprinting \u2014 principle and applications<\/li>\n<\/ul>\n\n\n\n
NCERT tip:<\/strong> Read the chapter twice, not once. Many questions come from lines that appear only once in the chapter \u2014 statements about enzymes, specific base pairs, or HGP statistics.<\/p>\n\n\n\n2. Principles of Inheritance and Variation (Class 12) \u2b50\u2b50\u2b50<\/h3>\n\n\n\n
Genetics is where toppers score big and average students lose marks unnecessarily. Questions here are predictable \u2014 the same types of problems repeat across years, just with different numbers or crosses.<\/p>\n\n\n\n
What to focus on:<\/strong><\/p>\n\n\n\n\n- Mendel’s laws \u2014 monohybrid and dihybrid crosses<\/li>\n\n\n\n
- Incomplete dominance and co-dominance<\/li>\n\n\n\n
- Multiple alleles \u2014 ABO blood grouping<\/li>\n\n\n\n
- Chromosomal theory of inheritance<\/li>\n\n\n\n
- Linkage and crossing over<\/li>\n\n\n\n
- Sex determination \u2014 XX\/XY, ZW\/ZZ, haplodiploidy<\/li>\n\n\n\n
- Mutation \u2014 types, causes<\/li>\n\n\n\n
- Genetic disorders \u2014 haemophilia, colour blindness, Down syndrome, Turner’s, Klinefelter’s<\/li>\n<\/ul>\n\n\n\n
Practice tip:<\/strong> Solve at least 50 genetics problems from PYQs. Pattern recognition is everything here.<\/p>\n\n\n\n3. Biotechnology: Principles and Processes (Class 12) \u2b50\u2b50\u2b50<\/h3>\n\n\n\n
This chapter carries around 12\u201313% of Biology marks<\/strong> and is almost entirely fact-based, which means it rewards students who read NCERT carefully. Do not skip it.<\/p>\n\n\n\nWhat to focus on:<\/strong><\/p>\n\n\n\n\n- Tools of recombinant DNA technology \u2014 restriction enzymes, vectors, host organisms<\/li>\n\n\n\n
- PCR \u2014 steps and applications<\/li>\n\n\n\n
- Gel electrophoresis<\/li>\n\n\n\n
- Cloning vectors \u2014 plasmids, bacteriophages<\/li>\n\n\n\n
- Expression of recombinant proteins<\/li>\n<\/ul>\n\n\n\n
4. Biotechnology and Its Applications (Class 12) \u2b50\u2b50<\/h3>\n\n\n\n
The applied side of Biotechnology is equally important and often tested alongside the principles chapter.<\/p>\n\n\n\n
What to focus on:<\/strong><\/p>\n\n\n\n\n- Genetically modified organisms \u2014 Bt cotton, Bt brinjal, Golden Rice<\/li>\n\n\n\n
- Gene therapy \u2014 ADA deficiency<\/li>\n\n\n\n
- Molecular diagnostics \u2014 PCR, ELISA<\/li>\n\n\n\n
- Transgenic animals and their applications<\/li>\n\n\n\n
- Biopiracy and patents<\/li>\n<\/ul>\n\n\n\n
5. Plant Physiology \u2014 Photosynthesis and Respiration (Class 11) \u2b50\u2b50<\/h3>\n\n\n\n
These two chapters together carry significant weightage and are deeply interconnected. Questions often test specific steps, enzyme names, and the location within the cell where reactions occur.<\/p>\n\n\n\n
Photosynthesis \u2014 focus on:<\/strong><\/p>\n\n\n\n\n- Light reactions vs dark reactions (Calvin cycle)<\/li>\n\n\n\n
- Photosystems I and II \u2014 pigments, wavelengths<\/li>\n\n\n\n
- Z-scheme of electron transport<\/li>\n\n\n\n
- C3, C4, and CAM plants \u2014 differences and examples<\/li>\n\n\n\n
- Photorespiration<\/li>\n<\/ul>\n\n\n\n
Respiration \u2014 focus on:<\/strong><\/p>\n\n\n\n\n- Glycolysis \u2014 complete step-by-step<\/li>\n\n\n\n
- Krebs cycle \u2014 products and enzymes<\/li>\n\n\n\n
- Electron transport chain<\/li>\n\n\n\n
- ATP yield calculations (a common question type)<\/li>\n\n\n\n
- Fermentation \u2014 types and products<\/li>\n<\/ul>\n\n\n\n
6. Reproduction in Flowering Plants (Class 12) \u2b50\u2b50<\/h3>\n\n\n\n
What to focus on:<\/strong><\/p>\n\n\n\n\n- Structure of flower \u2014 male and female parts<\/li>\n\n\n\n
- Microsporogenesis and megasporogenesis<\/li>\n\n\n\n
- Double fertilization \u2014 the logic and significance<\/li>\n\n\n\n
- Development of endosperm and embryo<\/li>\n\n\n\n
- Apomixis and polyembryony<\/li>\n\n\n\n
- Outbreeding devices<\/li>\n<\/ul>\n\n\n\n
7. Strategies for Enhancement in Food Production (Class 12) \u2b50<\/h3>\n\n\n\n
A relatively short chapter but questions come every year. Spend one focused day on it.<\/p>\n\n\n\n
What to focus on:<\/strong><\/p>\n\n\n\n\n- Plant breeding steps and objectives<\/li>\n\n\n\n
- Mutation breeding \u2014 examples<\/li>\n\n\n\n
- Biofortification \u2014 examples (Golden Rice, iron-rich crops)<\/li>\n\n\n\n
- Single cell protein<\/li>\n\n\n\n
- Tissue culture \u2014 totipotency, somatic hybridization<\/li>\n<\/ul>\n\n\n\n
ZOOLOGY \u2014 High-Weightage Chapters<\/h2>\n\n\n\n8. Human Physiology \u2014 The Biggest Zoology Chapter (Class 11) \u2b50\u2b50\u2b50<\/h3>\n\n\n\n
Human Physiology is arguably the single most important chapter group in NEET Biology. Across all sub-topics, it can contribute 10\u201314 questions<\/strong> \u2014 which is 40\u201356 marks. Strong Re-NEET 2026 biology preparation absolutely requires mastering this unit.<\/p>\n\n\n\nDigestion and Absorption:<\/strong><\/p>\n\n\n\n\n- Digestive enzymes \u2014 source, substrate, product<\/li>\n\n\n\n
- Absorption in different parts of intestine<\/li>\n\n\n\n
- Disorders \u2014 constipation, vomiting, jaundice, diarrhoea<\/li>\n<\/ul>\n\n\n\n
Breathing and Exchange of Gases:<\/strong><\/p>\n\n\n\n\n- Mechanism of breathing \u2014 muscles involved<\/li>\n\n\n\n
- Tidal volume, IRV, ERV, residual volume<\/li>\n\n\n\n
- Haemoglobin \u2014 oxygen dissociation curve<\/li>\n\n\n\n
- Respiratory disorders \u2014 asthma, emphysema, occupational diseases<\/li>\n<\/ul>\n\n\n\n
Body Fluids and Circulation:<\/strong><\/p>\n\n\n\n\n- Composition of blood and lymph<\/li>\n\n\n\n
- Structure of heart \u2014 diagram with all parts<\/li>\n\n\n\n
- Cardiac cycle \u2014 systole, diastole, heart sounds<\/li>\n\n\n\n
- ECG \u2014 what each component represents<\/li>\n\n\n\n
- Blood groups \u2014 ABO and Rh<\/li>\n\n\n\n
- Disorders \u2014 hypertension, coronary artery disease<\/li>\n<\/ul>\n\n\n\n
Excretory Products and Their Elimination:<\/strong><\/p>\n\n\n\n\n- Structure of nephron \u2014 diagram is essential<\/li>\n\n\n\n
- Urine formation \u2014 filtration, reabsorption, secretion<\/li>\n\n\n\n
- Regulation \u2014 ADH, renin-angiotensin<\/li>\n\n\n\n
- Disorders \u2014 renal failure, kidney stones, dialysis<\/li>\n<\/ul>\n\n\n\n
Locomotion and Movement:<\/strong><\/p>\n\n\n\n\n- Types of muscles \u2014 skeletal, smooth, cardiac<\/li>\n\n\n\n
- Structure of sarcomere<\/li>\n\n\n\n
- Sliding filament theory \u2014 step by step<\/li>\n\n\n\n
- Disorders \u2014 myasthenia gravis, muscular dystrophy, arthritis, gout<\/li>\n<\/ul>\n\n\n\n
Neural Control and Coordination:<\/strong><\/p>\n\n\n\n\n- Structure of neuron<\/li>\n\n\n\n
- Resting and action potential \u2014 ionic basis<\/li>\n\n\n\n
- Synapse \u2014 types and mechanism<\/li>\n\n\n\n
- Reflex arc<\/li>\n\n\n\n
- Parts of brain \u2014 functions of each<\/li>\n<\/ul>\n\n\n\n
Chemical Coordination:<\/strong><\/p>\n\n\n\n\n- Endocrine glands and their hormones<\/li>\n\n\n\n
- Hypothalamus-pituitary axis<\/li>\n\n\n\n
- Feedback mechanisms<\/li>\n\n\n\n
- Disorders \u2014 diabetes mellitus, diabetes insipidus, goitre, Addison’s disease<\/li>\n<\/ul>\n\n\n\n
9. Human Reproduction (Class 12) \u2b50\u2b50\u2b50<\/h3>\n\n\n\n
Consistently 5\u20137 questions per NEET paper, almost entirely from NCERT.<\/p>\n\n\n\n
What to focus on:<\/strong><\/p>\n\n\n\n\n- Male reproductive system \u2014 structure and function of each part<\/li>\n\n\n\n
- Female reproductive system \u2014 ovary, uterus, fallopian tube<\/li>\n\n\n\n
- Gametogenesis \u2014 spermatogenesis vs oogenesis (comparison diagram)<\/li>\n\n\n\n
- Menstrual cycle \u2014 phases, hormonal control<\/li>\n\n\n\n
- Fertilization and implantation<\/li>\n\n\n\n
- Placenta \u2014 functions<\/li>\n\n\n\n
- Parturition and lactation<\/li>\n<\/ul>\n\n\n\n
10. Reproductive Health (Class 12) \u2b50\u2b50<\/h3>\n\n\n\n
Short chapter, easy marks if you read NCERT carefully.<\/p>\n\n\n\n
What to focus on:<\/strong><\/p>\n\n\n\n\n- Contraceptive methods \u2014 types, examples, failure rates<\/li>\n\n\n\n
- STIs \u2014 names, causative organisms<\/li>\n\n\n\n
- Amniocentesis \u2014 purpose and controversy<\/li>\n\n\n\n
- Infertility treatments \u2014 IVF, IUI, GIFT, ZIFT<\/li>\n<\/ul>\n\n\n\n
11. Animal Kingdom (Class 11) \u2b50\u2b50<\/h3>\n\n\n\n
This chapter trips up many students because it requires memorizing classification features. The trick is to learn the distinguishing feature of each phylum \u2014 not every detail.<\/p>\n\n\n\n
What to focus on:<\/strong><\/p>\n\n\n\n\n- Basis of classification \u2014 symmetry, coelom, segmentation, notochord<\/li>\n\n\n\n
- Distinguishing features of each phylum \u2014 Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata, Chordata<\/li>\n\n\n\n
- Sub-phyla of Chordata \u2014 Urochordata, Cephalochordata, Vertebrata<\/li>\n\n\n\n
- Class-level features \u2014 Cyclostomata, Chondrichthyes, Osteichthyes, Amphibia, Reptilia, Aves, Mammalia<\/li>\n<\/ul>\n\n\n\n
12. Evolution (Class 12) \u2b50\u2b50<\/h3>\n\n\n\n
Questions from this chapter are concept-based and relatively straightforward once you understand the flow.<\/p>\n\n\n\n
What to focus on:<\/strong><\/p>\n\n\n\n\n- Origin of life \u2014 Miller and Urey experiment<\/li>\n\n\n\n
- Darwin’s theory vs Hugo de Vries<\/li>\n\n\n\n
- Evidences of evolution \u2014 palaeontological, embryological, biochemical<\/li>\n\n\n\n
- Hardy-Weinberg principle \u2014 equilibrium conditions<\/li>\n\n\n\n
- Types of natural selection<\/li>\n\n\n\n
- Human evolution \u2014 Homo habilis to Homo sapiens<\/li>\n<\/ul>\n\n\n\n
13. Ecology \u2014 Organisms and Populations + Ecosystem (Class 12) \u2b50\u2b50<\/h3>\n\n\n\n
Ecology is underestimated by most students but carries consistent weightage.<\/p>\n\n\n\n
What to focus on:<\/strong><\/p>\n\n\n\n\n- Population attributes \u2014 natality, mortality, age distribution<\/li>\n\n\n\n
- Population growth \u2014 logistic vs exponential, carrying capacity<\/li>\n\n\n\n
- Population interactions \u2014 mutualism, commensalism, parasitism, predation, competition<\/li>\n\n\n\n
- Ecosystem \u2014 components, food chains, food webs<\/li>\n\n\n\n
- Energy flow \u2014 10% law, ecological pyramids<\/li>\n\n\n\n
- Nutrient cycles \u2014 Carbon and Phosphorus cycle<\/li>\n\n\n\n
- Succession \u2014 primary vs secondary<\/li>\n\n\n\n
- Biodiversity \u2014 types, hotspots, threats<\/li>\n\n\n\n
- Environmental issues \u2014 ozone depletion, biomagnification, eutrophication<\/li>\n<\/ul>\n\n\n\n
The NCERT Rule \u2014 Non-Negotiable<\/h2>\n\n\n\n
One thing every serious NEET topper will tell you: 85% of Biology questions come directly from NCERT.<\/strong> Not from coaching modules, not from reference books \u2014 from the exact lines, diagrams, and tables in your NCERT textbook.<\/p>\n\n\n\nFor Re-NEET 2026 biology preparation, this means:<\/p>\n\n\n\n
![\"Re-NEET](\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/05\/re-neet-2026-biology-preparation-high-weightage-chapters-1024x572.png\")
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