Re-NEET 2026 Biology Questions PDF: 50 Most Expected NCERT Questions, Chapter-Wise Weightage & Revision Plan

Re-NEET Biology 2026: Quick Highlights

Also Check: High-Weightage Biology Chapters

Re-NEET Biology 2026: What Has Changed After the Original Exam?

The original NEET 2026 Biology paper showed a noticeable shift towards statement-based questions, NCERT line interpretation, and concept application. Compared to previous years, students encountered more questions that tested understanding of NCERT statements, diagrams, examples, and biological processes rather than direct factual recall.

For Re-NEET 2026, aspirants should therefore focus on NCERT line-by-line revision, assertion-reason practice, diagram-based learning, and application-oriented Biology questions from Genetics, Human Physiology, Biotechnology, and Ecology. Students preparing for Re-NEET 2026 examination should therefore prioritise conceptual clarity, NCERT revision, and repeated practice of assertion-reason questions rather than relying solely on memorisation.

Download Re-NEET 2026 Biology Questions PDF (50 Most Expected NCERT Questions)

Re-neet 2026 most expected questions for biology are given below in downloadable form.

Check now:

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• NEET Re-Exam 2026: Important Chapters, Expected Difficulty & Strategy
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• Re-NEET Mock Test 2026 PDF

Biology Chapter-wise Weightage: Most Important Biology Chapters for Re-NEET 2026

Analysing chapter-wise weightage is one of the smartest ways to prioritise Biology preparation for Re-NEET 2026. Recent NEET papers show that a relatively small group of chapters consistently contributes a large share of questions. Students aiming for maximum marks should focus first on these high-weightage units before moving to lower-priority chapters.

Most Important Biology Chapters for Re-NEET 2026

The most important Biology chapters for Re-NEET 2026 are:

• Molecular Basis of Inheritance

• Principles of Inheritance and Variation

• Human Physiology

• Biotechnology

• Ecology and Environment

• Human Reproduction

• Animal Kingdom

• Cell Cycle and Cell Division

These chapters have consistently contributed the highest number of Biology questions in recent NEET examinations.

Re-NEET 2026 Most Expected Biology Questions

To help students strengthen their Re NEET preparation, we have provided a set of highly important and exam-oriented Biology questions based on NCERT trends, previous year questions, and NEET chapter-wise weightage analysis. These questions are prepared from the most scoring units of NEET Biology, including Genetics, Human Physiology, Biotechnology, Ecology, and Reproduction.

Students should first attempt the questions below in exam-like conditions and then practise additional questions using the downloadable PDF provided in the table for better revision and accuracy.

Q1. Which of the following is the correct unit of productivity in an ecosystem?

(1) $\text{KCal m}^{-2}\text{yr}^{-1}$

(2) $\text{g m}^{-2}$

(3) $\text{KCal m}^{-2}$

(4) $\text{KCal m}^{-3}$

Correct Answer: (1) $\text{KCal m}^{-2}\text{yr}^{-1}$

Explanation:

Productivity is measured as the rate of energy production per unit area per unit time. Therefore, its unit is:

$\text{KCal m}^{-2}\text{yr}^{-1}$

Q2. The first occurrence of menstruation in females is known as:

(1) Ovulation

(2) Menopause

(3) Menarche

(4) Diapause

Correct Answer: (3) Menarche

Explanation:

Menarche marks the beginning of the menstrual cycle in females and indicates reproductive maturity.

Q3. Genes $R$ and $Y$ assort independently. If $RRYY$ produces round yellow seeds and $rryy$ produces wrinkled green seeds, what is the phenotypic ratio in the $F_2$ generation?

(1) $9:7$

(2) $1:2:1$

(3) $3:1$

(4) $9:3:3:1$

Correct Answer: (4) $9:3:3:1$

Explanation:

This is a classic dihybrid cross demonstrating Mendel’s law of independent assortment.

Phenotypic ratio in the $F_2$ generation:

$9:3:3:1$

Q4. What is the main function of spindle fibres during mitosis?

(1) Regulate cell growth

(2) Separate chromosomes

(3) Synthesise DNA

(4) Repair DNA

Correct Answer: (2) Separate chromosomes

Explanation:

Spindle fibres attach to centromeres and pull sister chromatids toward opposite poles during cell division.

Q5. How many meiotic and mitotic divisions are required to form a mature female gametophyte from a megaspore mother cell in angiosperms?

(1) No meiosis and $2$ mitosis

(2) $2$ meiosis and $3$ mitosis

(3) $1$ meiosis and $2$ mitosis

(4) $1$ meiosis and $3$ mitosis

Correct Answer: (4) $1$ meiosis and $3$ mitosis

Explanation:

One meiotic division produces four megaspores. One functional megaspore then undergoes three mitotic divisions to form the embryo sac.

Q6. Which of the following statements about antibody structure is NOT correct?

(1) Constant regions are at the C-terminal

(2) Two heavy and two light chains are present

(3) Chains are linked by disulfide bonds

(4) Antigen-binding site is at the C-terminal

Correct Answer: (4) Antigen-binding site is at the C-terminal

Explanation:

The antigen-binding site is located at the variable region near the N-terminal end, not at the C-terminal end.

Q7. Who proposed that the genetic code consists of triplet nucleotides?

(1) Franklin Stahl

(2) George Gamow

(3) Francis Crick

(4) Jacques Monod

Correct Answer: (2) George Gamow

Explanation:

George Gamow proposed that the genetic code is made up of triplet nucleotides called codons.

Q8. Which equation represents logistic population growth?

(1) $\dfrac{dN}{dt} = N\left(\dfrac{r-K}{K}\right)$

(2) $\dfrac{dN}{dt} = r\left(\dfrac{K-N}{K}\right)$

(3) $\dfrac{dN}{dt} = rN\left(\dfrac{K-N}{K}\right)$

(4) $\dfrac{dN}{dt} = rN\left(\dfrac{N-K}{N}\right)$

Correct Answer: (3)

Explanation:

The logistic growth equation is:

$\dfrac{dN}{dt} = rN\left(\dfrac{K-N}{K}\right)$

where:

$N$ = population size

$r$ = intrinsic rate of increase

$K$ = carrying capacity

Q9. Which hormone is released by the pituitary gland but synthesised in the hypothalamus?

(1) ACTH

(2) LH

(3) ADH

(4) FSH

Correct Answer: (3) ADH

Explanation:

ADH (Antidiuretic Hormone) is synthesised in the hypothalamus and stored and released by the posterior pituitary gland.

Q10. Inhibition of succinic dehydrogenase enzyme by malonate is a classical example of:

(1) Competitive inhibition

(2) Enzyme activation

(3) Cofactor inhibition

(4) Feedback inhibition

Correct Answer: (1) Competitive inhibition

Explanation:

Malonate structurally resembles succinate and competes for the active site of the succinic dehydrogenase enzyme, thereby blocking substrate binding.

High-Value Re-NEET 2026 Study Resources for Maximum Score:

• NEET Question Paper
• NEET 2026 Answer with Solution PDF
• Formulas for Re-neet 2026
• Re-NEET Sample Paper 2026 PDF
• NEET 2026 Mock Test Series (Days 1-10)

Why NCERT Is Non-Negotiable for Re-NEET Biology

NCERT remains the single most important resource for Re-NEET Biology preparation. Analysis of recent NEET papers shows that most Biology questions originate directly or indirectly from NCERT definitions, diagrams, examples, tables, and conceptual statements. Students who thoroughly revise NCERT often gain a significant advantage over those relying heavily on reference books.

In recent NEET question papers, even the difficult questions were not “outside syllabus.” Instead, they tested how deeply students understood NCERT concepts. For example, a direct statement from Molecular Basis of Inheritance may appear in the exam as an assertion-reason or match-the-column question.

Why NCERT Matters So Much

• Around 80–85% of Biology questions are NCERT-based

• Diagrams are directly asked in exams

• Definitions and examples frequently appear

• NCERT tables and scientific names are highly important

• Statement-based questions now dominate the paper pattern

For Re-NEET preparation, students should focus on:

• NCERT line-by-line reading

• Chapter-wise NEET PYQ practice

• Diagram revision

• Statement and assertion-reason NEET biology MCQs

• Repeated revision instead of multiple books

Can Biology Alone Improve Your NEET Rank?

A 20–30 mark improvement in Biology can significantly affect overall NEET rank because Biology contributes 50% of the total paper. Students who strengthen NCERT-based chapters, reduce negative marking, and improve question accuracy often see substantial rank gains.

Why These Biology Questions Are Important for Re-NEET 2026

The questions provided above are selected after analysing previous NEET papers, NCERT line-based concepts, chapter-wise weightage trends, and commonly repeated topics. Students should not treat them as prediction questions alone. Instead, they should use them to identify important concepts, improve conceptual clarity, and revise NCERT facts frequently tested by NTA.

Many recent Biology questions have been statement-based, assertion-reason based, and diagram-oriented. Therefore, students should focus equally on understanding the explanation and revising the corresponding NCERT chapter.

Chapter-wise Most Expected NCERT Questions for Re-NEET Biology

Biology questions in Re-NEET are expected to remain heavily NCERT-focused, especially from high-weightage chapters that have consistently produced repeated questions over the years. Based on recent NEET trends, PYQ analysis, and NCERT line-based concepts, the following chapters are likely to dominate the Re-NEET Biology paper.

Molecular Basis of Inheritance (Class 12)

This is the highest-weightage chapter in NEET Biology and often contributes 5–6 questions.

Most Expected Topics

• DNA replication

• Semi-conservative replication

• Transcription and translation

• Genetic code

• Lac operon

• Human Genome Project

• DNA fingerprinting

Questions Highly Likely to Appear

• Enzymes involved in DNA replication

• Difference between coding and template strand

• Structure and function of tRNA

• Central dogma of molecular biology

• Steps of transcription in eukaryotes

• Coupled transcription and translation in prokaryotes

Important NCERT Focus Areas

• Diagrams of DNA replication

• Genetic code table

• Lac operon diagram

• Definitions highlighted in NCERT

Principles of Inheritance and Variation

Genetics is among the most repeated units in NEET Biology.

Most Expected Topics

• Mendel’s laws

• Codominance

• Incomplete dominance

• Blood group inheritance

• Pedigree analysis

• Sex-linked disorders

• Chromosomal disorders

• Important Disorders

• Down syndrome

• Turner syndrome

• Klinefelter syndrome

• Haemophilia

• Colour blindness

Important Question Types

• Assertion-reason questions

• Pedigree charts

• Ratio-based genetics questions

• Chromosomal abnormality identification

Human Physiology (Class 11)

Human Physiology contributes the highest number of Zoology questions in NEET.

Most Important Chapters

• Breathing and Exchange of Gases

• Body Fluids and Circulation

• Excretory Products and Their Elimination

• Neural Control and Coordination

• Chemical Coordination and Integration

Most Expected Questions

• Cardiac cycle

• ECG waves

• Nephron structure

• Hormone functions

• Respiratory volumes

• Sliding filament theory

• Reflex arc

• Diagrams to Revise Daily

• Human heart

• Nephron

• Synapse

• Neuron

• Muscle fibre

Biotechnology: Principles and Processes

This chapter is extremely NCERT-oriented and easy to score from.

Important Topics

• Restriction enzymes

• Cloning vectors

• PCR

• Gel electrophoresis

• Recombinant DNA technology

• Bioreactors

Most Expected Questions

• Steps of PCR

• Sticky ends vs blunt ends

• Functions of vectors

• Role of restriction enzymes

• Diagram-based biotechnology questions

• Animal Kingdom

Animal Kingdom questions are mostly direct NCERT factual questions.

Important Areas

• Basis of classification

• Symmetry

• Coelom

• Notochord

• Examples from each phylum

Common Question Pattern

NTA often asks questions like:

• “Which organism belongs to Phylum X?”

• “Identify the correct characteristic of a given phylum.”

Students must memorise NCERT organism examples carefully.

Ecology and Environment

Ecology has become increasingly important in recent NEET papers and remains one of the easiest scoring units.

Most Expected Topics

• Population interactions

• Ecological pyramids

• Food chains

• Ecological succession

• Biodiversity hotspots

• Nutrient cycles

Important NCERT Concepts

• 10% law

• Productivity units

• Ecological succession

• Carbon and nitrogen cycles

Ecology questions are usually direct and highly scoring if revised properly from NCERT.

How to Score 340+ Marks in Biology in Re-NEET 2026

Students targeting 340+ marks in Biology should prioritise NCERT revision over reference books, solve chapter-wise PYQs, revise all NCERT diagrams repeatedly, practise assertion-reason questions, and attempt full-length Biology mock tests regularly. Consistent revision of Genetics, Human Physiology, Biotechnology, and Ecology can significantly improve scoring potential.

Re-NEET Biology Preparation Checklist

Use this checklist during your final revision phase to ensure you cover all high-weightage Biology topics before the exam.

Final Biology Revision Checklist

• Revise NCERT Class 11 Biology at least twice

• Revise NCERT Class 12 Biology at least twice

• Solve NEET PYQs chapter-wise

• Practise assertion-reason questions regularly

• Revise all important diagrams daily

• Memorise scientific names and organism examples

• Focus repeatedly on Genetics and Human Physiology

• Solve full-length Biology mock tests

• Analyse mistakes after every mock test

• Revise Ecology and Biotechnology thoroughly

• Make short notes for definitions and important examples

• Revise NCERT tables, flowcharts, and highlighted points regularly

Access Other Preparation Resources:

• Top 100 Most Expected NCERT Questions for NEET 2026
• NEET PYQs Chapterwise
• NEET 2026 Biology: Top 50 Most Expected Questions with Solutions – Download PDF
• NEET Previous Year Question Papers (2016-2025) with Solution

Common Mistakes Students Make in Re-NEET Biology

Many students prepare hard for Re-NEET Biology but still lose marks because of avoidable mistakes during revision. Since NEET Biology is heavily NCERT-based, even small errors like skipping important NEET diagrams, ignoring examples, or relying too much on reference books can significantly affect the final score. Understanding these common mistakes can help students prepare smarter and improve accuracy in the exam.

Ignoring NCERT Diagrams

• Diagrams are among the most repeated question sources in NEET Biology.

• Many questions are directly based on labelled structures, flowcharts, and biological processes shown in NCERT.

Depending Too Much on Reference Books

• Most reference books add unnecessary information that wastes revision time.

• NCERT should remain the primary source for Re-NEET Biology preparation.

Skipping Class 11 Biology

• Class 11 contributes nearly half of the Biology paper. Chapters like Human Physiology, Cell Biology, Animal Kingdom, and Plant Physiology are highly important.

Ignoring NCERT Examples

• NTA often directly asks organism names, scientific examples, and applications mentioned in NCERT textbooks.

Not Practising Assertion-Reason Questions

• Assertion-reason and statement-based questions have become increasingly common in recent NEET papers.

Memorising Without Understanding

• Application-based Biology questions are increasing every year, especially in Genetics, Biotechnology, Ecology, and Human Physiology.

• Students should focus on conceptual clarity instead of rote learning alone.