NEET 2026 Biology: Most Repeated Topics & Weightage (10-Year Analysis)

Introduction: The Pareto Principle (80/20 Rule)

Biology constitutes 50% of your NEET score. If you mess this up, no amount of Physics can save you.

But here is the secret: You don't need to memorize every single line with equal intensity.

Analysis of the last decade shows that 80% of the questions come from 20% of the topics.

To help you study smarter, not just harder, we have compiled the NEET 2026 Biology most repeated topics list. These are the specific concepts that examiners love to ask year after year. Master these, and you are guaranteed a 340+ baseline.

1. The "Super Heavyweights" (40-50 Marks Each)

These units are non-negotiable. They are the backbone of the NEET paper.

A. Genetics & Evolution (The King)

• Average Questions: 12-15

• Repeated Themes:

  • Molecular Basis: Lac Operon (Asked almost every year), DNA Fingerprinting steps, Transcription/Translation machinery.

  • Mendelian Genetics: Linkage & Recombination (Morgan’s experiments), Genetic Disorders (Color blindness, Haemophilia pedigree analysis).

  • Evolution: Hardy-Weinberg Principle (Numerical), Homologous vs Analogous organs.

B. Biotechnology (High ROI)

• Average Questions: 6-8

• Why it's Gold: Only 2 small chapters, but huge weightage.

• Repeated Themes:

  • Process: PCR (Steps and Temp), Restriction Enzymes (EcoRI naming), Gel Electrophoresis.

  • Applications: Bt Cotton (Cry genes), RNA Interference (RNAi), Insulin production.

2. NEET 2026 Biology Most Repeated Topics: The "Hidden Gems"

These are small chapters that take 2 hours to read but guarantee 8-12 marks.

1. Microbes in Human Welfare:

   • Theme: Sewage Treatment (primary vs secondary), Bioactive molecules (Cyclosporin A, Statins - match the column questions are frequent).

2. Reproductive Health:

   • Theme: Contraceptive methods (IUDs examples), ART techniques (GIFT vs ZIFT distinction).

3. Cell Cycle & Cell Division:

   • Theme: Prophase I stages (Leptotene to Diakinesis - match the events), Metaphase features.

3. Human Physiology: Specific Focus Areas

Don't read the whole book blindly. Focus here:

Chapter	Most Repeated Concept
Digestion	Deleted in new NCERT (Check updated syllabus)
Breathing	Transport of Gases ($O_2$ dissociation curve), Volumes & Capacities.
Body Fluids	Cardiac Cycle (0.8s breakdown), ECG Graph interpretation.
Excretion	Counter Current Mechanism (Loop of Henle), RAAS mechanism.
Neural Control	Generation of Nerve Impulse, Structure of Ear/Eye parts.
Chemical Coord.	Hormones of GI Tract, Thyroid disorders.

4. Plant Physiology: The "Confusing" Block

Most students skip this. If you master these themes, you win.

• Photosynthesis: $C_3$ vs $C_4$ Cycle differences, Chemiosmotic Hypothesis.

• Respiration: Glycolysis steps (ATP usage), Krebs Cycle enzymes.

• Plant Growth: Hormones (Auxin vs Gibberellins functions - highly repeated).

5. 10-Year Weightage Analysis Table

Unit	Approx Weightage	Difficulty Level
Diversity in Living World	10-12%	Moderate (Memory heavy)
Structural Org. (Plants/Animals)	8-10%	Moderate
Cell Structure & Function	12-14%	Easy (High Scoring)
Plant Physiology	15%	Hard (Conceptual)
Human Physiology	20%	Moderate
Reproduction	10%	Easy
Genetics & Evolution	22%	Hard (Conceptual)
Biology in Human Welfare	8%	Easy
Biotechnology	10%	Easy
Ecology	12-14%	Easy (Memory heavy)

Conclusion: The Strategy

To hit that 360/360, your sequence of study should be:

1. Biotech & Ecology (Easiest marks).

2. Genetics (Highest weightage).

3. Human Physiology (Most interesting).

4. Plant Physiology (The rank decider).

Focus on the NEET 2026 Biology most repeated topics listed above first. Master the diagrams and the summary tables in NCERT.

Frequently Asked Questions (FAQs)

1. Which unit has the highest weightage in NEET Biology?

Genetics & Evolution consistently has the highest weightage, accounting for roughly 12-15 questions (50-60 marks). Ecology is the second highest with 10-12 questions.

2. Is NCERT enough for NEET Biology 2026?

Yes, 98% of the paper is directly from NCERT lines. For the remaining 2%, you need to understand the application of concepts (especially in Genetics and Physiology). Do not waste time on Trueman's or heavy reference books.

3. What are the 'Do or Die' chapters for NEET 2026?

The 'Do or Die' chapters are: Molecular Basis of Inheritance, Principles of Inheritance, Biotechnology (Principles & Processes), Sexual Reproduction in Flowering Plants, and Cell Cycle.

4. How many questions come from Human Physiology?

Usually, around 12 to 14 questions come from Human Physiology. However, the questions are now more statement-based and assertion-reason type, requiring deep conceptual clarity.

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