Biotechnology NEET Previous Year Questions with Answers & Analysis (2021–2025)

Biotechnology NEET PYQs Highlights

Before practising the Biotechnology NEET previous year questions, candidates should be familiar with the key details of the unit, including its weightage, chapters, expected number of questions, and difficulty level. The table below provides a quick overview to help students plan their NEET 2027 preparation effectively.

Download Biotechnology PYQs PDF for NEET 2027

Practising Biotechnology NEET previous year questions (PYQs) is one of the most effective ways to prepare for NEET UG 2027. Aspirants can check the Biotechnology NEET PYQs PDF given below in the table to understand repeated concepts, question patterns, and the level of difficulty asked in the exam.

Biotechnology NEET Previous Year Questions

Practising Biotechnology NEET Previous Year Questions helps students understand the latest exam pattern, frequently asked concepts, and high-weightage topics. Below are Biotechnology questions from the RE-NEET 2026 question paper, along with the correct answers and concise explanations to help aspirants strengthen their NEET 2027 preparation.

1. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: In recombinant DNA technology, lysozyme is used for disrupting bacterial cells while cellulase is for plant cells.

Reason R: Isolation of genetic material needs disruption of cells.

In the light of the above statements, choose the most appropriate answer from the options given below:

(1) A is not correct but R is correct

(2) Both A and R are correct and R is the correct explanation of A

(3) Both A and R are correct but R is NOT the correct explanation of A

(4) A is correct but R is not correct

Correct Answer: (3) Both A and R are correct but R is NOT the correct explanation of A

Explanation: Lysozyme digests the bacterial cell wall, while cellulase breaks down the cellulose cell wall of plant cells. Although isolation of genetic material requires cell disruption, this does not explain why different enzymes are used for bacterial and plant cells.

2. The inactive form of Bt toxin is converted to the active form in the insect gut ________.

(1) by nucleases

(2) due to alkaline pH

(3) due to acidic pH

(4) by proteases

Correct Answer: (2) due to alkaline pH

Explanation: The inactive Bt toxin (protoxin) is activated in the alkaline environment of the insect gut, where it becomes toxic and damages the gut epithelial cells.

3. Match List-I with List-II.

Choose the correct answer from the options given below:

(1) A-IV, B-I, C-III, D-II

(2) A-II, B-I, C-IV, D-III

(3) A-I, B-II, C-IV, D-III

(4) A-III, B-IV, C-II, D-I

Correct Answer: (2) A-II, B-I, C-IV, D-III

Explanation: Transformation involves transferring DNA into host bacteria, the cloning site contains restriction enzyme recognition sites, selection is carried out using antibiotic resistance markers, and the origin of replication (Ori) is responsible for DNA replication.

4. Given below are two statements:

Statement I: Plasmids are autonomously replicating DNA.

Statement II: Plasmids are extrachromosomal DNA.

In the light of the above statements, choose the most appropriate answer from the options given below:

(1) Statement I is incorrect but Statement II is correct

(2) Both Statement I and Statement II are correct

(3) Both Statement I and Statement II are incorrect

(4) Statement I is correct but Statement II is incorrect

Correct Answer: (2) Both Statement I and Statement II are correct

Explanation: Plasmids are small circular DNA molecules that exist outside the bacterial chromosome and replicate independently, making both statements correct.

5. During PCR, primers bind to the DNA strands in the ________ step.

(1) ligation

(2) denaturation

(3) extension

(4) annealing

Correct Answer: (4) annealing

Explanation: During the annealing step of PCR, primers bind (anneal) to their complementary DNA sequences. DNA polymerase then extends these primers during the extension step to synthesize new DNA strands.

Biotechnology NEET PYQs: Important Chapters

Biotechnology is an important unit in NEET, and questions from important concepts are often repeated from previous years. Focusing on high-yield chapters can help students score well and save time during the exam. There are two important chapters under the biotechnology unit that every NEET aspirant must prepare well:

Chapter – Principles and Processes of Biotechnology

This chapter focusses on biotech principles such as genetic and bioprocess engineering. It also covers the tools and processes used in recombinant DNA technology.

Key Concepts to Focus

• Tools of Recombinant DNA Technology: Learn the roles of restriction enzymes, ligases, and vectors like plasmids and bacteriophages. Understand how each tool works to introduce a foreign gene into host organisms.

• Processes: Isolation of DNA, cutting and joining, inserting into a host, and cloning vectors.

• Bioreactors and Downstream Processing: Understand bioreactor design and working principle.

Chapter 2 – Biotechnology and Its Applications

This chapter includes the applications of biotechnology in the fields of agriculture and medicine. It includes various products that are made with the help of rDNA technology. These products are useful for human health and sustainable agriculture. It also discusses the formation of transgenic animals and the ethical issues related to them.

Key Concepts to Focus

• Agricultural Applications: Bt crops, RNA interference, transgenic plants
• Medical Applications: Insulin production, gene therapy, techniques like PCR, ELISA
• Transgenic Animals: Examples and their application in various fields
• Ethical Issues: Biopiracy, biosafety, patents laws

Most Important Biotechnology Topics for NEET 2027

Biotechnology is a high-scoring unit in NEET, with several concepts being tested repeatedly over the years. The table below highlights the most important topics that candidates should prioritise while preparing for NEET 2027.

Biotechnology NEET Weightage Analysis (2021–2026)

The table given below gives NEET weightage analysis of questions from the two chapters of the unit Biotechnology from 2021 to 2026:

From the above table, it can be observed that on average, there are 6-10 questions from the Biotechnology unit every year, accounting for approximately 32-36 marks. This contributes to a significant 9.4% of the total NEET biology syllabus, showing its importance for the students who aim to score good marks.

How to Prepare Biotechnology for NEET 2027?

The unit of Biotechnology is quite scoring and easy if proper steps are followed. Here is a list of smart NEET preparation tips that students can follow to have a clear understanding of the unit.

Thorough NCERT Reading

Every NEET question comes directly or indirectly from the NCERT lines or diagrams. As a result, it is critical to begin by reading the NCERT textbook line by line and highlighting the most important points and definitions.

Concept Maps and Flowcharts

Concept maps and flowcharts are very helpful in learning the steps of a process. For example, steps of recombinant DNA technology, PCR, ELISA and insulin synthesis.

Mnemonics

Mnemonics make learning easy and fun. Processes that include several steps can be learned in minutes, for example, the steps of rDNA technology or PCR.

Solving PYQs and Concept-Based MCQs

Many of the MCQs in biotechnology are conceptual in nature. Therefore, it becomes essential to practice the NEET MCQs. Mastering PYQs ensures high accuracy and boosts confidence during the exam.