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CBSE Class 12 Biology Chapter 10 Biotechnology and its Applications Worksheet with Answers

Chapter 10 Biotechnology and its Applications is among the most scoring chapters in CBSE Class 12 Biology, blending theory with real-world applications. This printable worksheet is tailored to the latest NCERT syllabus and includes diverse question types—MCQs, fill-in-the-blanks, short answers, long answers, and a case study—to mirror the board exam pattern. Students should attempt this under exam conditions within 90 minutes to build confidence and revision efficiency.

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Key takeaways

✓Chapter 10 Biotechnology and its Applications is a high-scoring, application-based chapter carrying 4-5 marks in CBSE Class 12 Biology board exams.
✓Genetically modified crops like Bt cotton and Golden Rice are crucial NCERT-based examples that appear frequently in short-answer questions.
✓Transgenic animals serve roles in research, medicine production (like alpha-1-antitrypsin), and disease modelling—a common long-answer topic.
✓Gene therapy techniques, especially ADA deficiency treatment using retroviral vectors, are favourite topics for case-study and HOTS questions.
✓Understanding applications in agriculture, medicine, and industry helps tackle diagram-based and scenario-driven questions in board exams.
✓Practising worksheet questions under timed conditions builds speed and accuracy for the 3-hour Biology board examination.
✓Answer keys with brief explanations reinforce conceptual clarity and prevent rote learning, crucial for scoring above 90 in Biology.

Quick Chapter Recap: Biotechnology and its Applications

Biotechnology and its Applications explores how recombinant DNA technology and genetic engineering are harnessed in agriculture, medicine, and industry. Key topics include genetically modified crops such as Bt cotton, Bt brinjal, and Golden Rice that improve yield, pest resistance, and nutritional value. Transgenic animals are engineered for biological product synthesis, organ transplantation research, vaccine safety testing, and disease modelling. Gene therapy offers hope for treating genetic disorders; the classic example is ADA deficiency, where functional genes are introduced via retroviral vectors into lymphocytes or bone marrow cells. The chapter also covers biosafety concerns, including the Cartagena Protocol on Biosafety, biopiracy issues, and ethical debates around genetically modified organisms. Students must distinguish between processes (gene cloning, vector design) and outcomes (pest-resistant crops, insulin production in bacteria). This recap sets the stage for tackling the diverse question formats in this worksheet, ensuring you approach each section with conceptual clarity and accurate NCERT terminology.

GM Crops: Bt cotton (cry genes), Golden Rice (beta-carotene), Bt toxin mechanism, pest resistance
Transgenic Animals: alpha-1-antitrypsin in milk, human proteins in eggs, disease models for cancer and Alzheimer's
Gene Therapy: ex vivo vs in vivo, ADA deficiency treatment, retroviral vectors, challenges and successes
Biosafety: GEAC (Genetic Engineering Approval Committee), bioethics, biopiracy, patent issues (Basmati rice case)

Section A: Multiple Choice Questions (1 mark each)

Multiple-choice questions test recall and understanding of specific facts from NCERT Class 12 Biology Chapter 10. Each MCQ is designed to assess your grasp of definitions, examples, mechanisms, and applications. Read each question carefully; note that distractors often use terms from other chapters or common misconceptions. For instance, distinguishing between Bt toxin's protoxin form in bacteria and its active form in insect gut pH is a frequent trap. Similarly, knowing the exact role of GEAC (approval and monitoring of GM research) versus other regulatory bodies helps eliminate wrong options. Attempt all six questions, mark your answers, and cross-check with the answer key provided at the end of this worksheet. Practising MCQs sharpens your speed for the board exam where quick, accurate selection is crucial. Remember, negative marking does not apply in CBSE boards, so always attempt every MCQ even if unsure. Use elimination techniques: rule out obviously incorrect options first, then choose the best fit from the remaining choices. This section forms the foundation for objective-type questions that now appear regularly in CBSE Class 12 Biology papers.

Section B: Fill in the Blanks (1 mark each)

Fill-in-the-blank questions require precise NCERT terminology and factual accuracy. Chapter 10 is rich in specific names of genes, proteins, organisms, and processes that must be recalled verbatim. For example, the gene introduced into Golden Rice is psy (phytoene synthase) alongside other carotenoid pathway genes, and the bacterial source is often Erwinia uredovora or daffodil genes. Similarly, the nematode that attacks tobacco plant roots is Meloidogyne incognitia, and the strategy to prevent infestation involves RNA interference (RNAi) technology. When filling blanks, pay attention to singular versus plural forms, correct spelling, and whether a common name or scientific name is expected. Do not leave blanks empty; even educated guesses based on chapter context can earn you marks in board exams. This section trains your memory for definitions and examples that frequently appear in 1-mark or 2-mark short-answer questions. After attempting, verify each answer against the answer key. If you made errors, revisit that NCERT section to reinforce the correct term. Consistent practice with such questions builds the factual backbone necessary for scoring high in CBSE Class 12 Biology board examinations.

Section C: Match the Following / True or False (1 mark each)

This section tests your ability to correctly pair concepts, examples, and applications or to identify the validity of statements based on NCERT Class 12 Biology Chapter 10. Matching questions often link GM crops to their specific traits, transgenic animals to their uses, or regulatory bodies to their functions. True/False questions require careful reading—statements may be partially correct but contain one factual error that makes them false. For instance, saying Bt toxin is active in bacterial cells is false; it becomes active only in the alkaline gut of insects. When attempting Match the Following, first match the pairs you are absolutely certain about, then use elimination for the rest. For True/False, if even one part of the statement is incorrect, mark it False. These question types appear in CBSE board exams to test nuanced understanding rather than rote memory. They reward students who have read NCERT carefully and can distinguish between similar-sounding concepts. After completing this section, cross-check your answers with the detailed answer key provided. If you missed any, revisit the relevant NCERT pages and make notes to avoid repetition of errors in future practice sessions or the actual board exam.

Section D: Short Answer Questions (2–3 marks each)

Short-answer questions form the backbone of the CBSE Class 12 Biology board exam, typically carrying 2 or 3 marks each. In Chapter 10, you must write concise, structured answers that directly address the question without unnecessary elaboration. Use bullet points or numbered steps where applicable to improve readability and ensure no key point is missed. For example, when asked about the role of transgenic animals, mention biological product synthesis, vaccine safety testing, disease modelling, and organ transplant research, providing one brief example for each. Always include NCERT-specific examples: Bt cotton for pest resistance, Golden Rice for vitamin A, rosie the transgenic cow for human protein-enriched milk. Define technical terms in your answer—like explaining that Bt toxin is an insecticidal protein encoded by cry genes. Avoid vague statements; instead of writing 'biotechnology helps agriculture', specify how: by reducing pesticide use, increasing yield, or enhancing nutritional content. Diagrams, if asked, should be neat and labelled; for instance, a simple flow chart of gene therapy steps scores well. This section mirrors typical board exam questions, so practising these five questions under timed conditions prepares you for the actual paper. After attempting, compare your answers with the model answers in the key to identify gaps in content, structure, or terminology.

Section E: Long Answer and HOTS Questions (5 marks each)

Long-answer questions demand comprehensive, well-organised responses covering multiple sub-topics within Chapter 10 Biotechnology and its Applications. A 5-mark question expects you to write around 150–200 words, structured in clear paragraphs or numbered points. Start with a crisp definition or introduction, then elaborate with examples, processes, and outcomes. For instance, if asked about applications of biotechnology in medicine, discuss insulin production in bacteria, gene therapy for genetic disorders, vaccine development, and diagnostic tools, dedicating 2–3 sentences to each application. Include NCERT diagrams where relevant—gene therapy flowcharts, mechanism of Bt toxin action, or the structure of a retroviral vector. HOTS (Higher Order Thinking Skills) questions test your ability to apply concepts to new scenarios, analyse data, or evaluate ethical issues. For example, you might be asked to assess the environmental risks of releasing GM crops or to compare ex vivo and in vivo gene therapy techniques. Always support your arguments with scientific reasoning and examples from the chapter. Use proper biological terminology: protoxin, alkaline gut pH, retroviral vector, lymphocytes, ADA enzyme, biopiracy, biosafety regulations. This section prepares you for the most challenging questions in the CBSE Class 12 Biology board exam, where depth of understanding and clarity of expression determine high scores.

Section F: Case-Study Question (4 marks)

Case-study questions have become a staple of CBSE Class 12 Biology board exams since 2020. These questions present a real-world scenario, a data table, or a passage describing an application of biotechnology, followed by 3–4 sub-questions testing comprehension, analysis, and application skills. In Chapter 10, a typical case study might describe a farmer using Bt cotton and observing reduced pest attacks, then ask you to identify the gene involved, explain the mechanism, and discuss environmental benefits. Another scenario could involve a patient receiving gene therapy for ADA deficiency, prompting questions on the vector used, the procedure, and its advantages over enzyme replacement therapy. Read the case carefully, underline keywords, and ensure your answers are rooted in the information provided as well as your NCERT knowledge. Each sub-question usually carries 1 mark, so keep answers brief and to the point—1 or 2 sentences suffice. Case studies reward students who can connect theoretical concepts to practical situations, a skill highly valued in modern CBSE assessments. Practising this section enhances your ability to interpret data, draw conclusions, and communicate scientific understanding clearly. After attempting, review the model answers to see how key points are concisely captured and how the answer directly addresses the question asked.

Answer Key: Section A (MCQs)

The answer key for Section A provides correct options along with brief explanations to reinforce learning and clarify any doubts. Each explanation references NCERT Class 12 Biology Chapter 10 content, ensuring alignment with board exam expectations. When reviewing your answers, do not just check if you got it right—read the explanation to understand why that option is correct and why others are not. This deepens conceptual clarity and prevents repeated mistakes. For instance, if you chose the wrong bacterium for Bt toxin production, the explanation reminds you that Bacillus thuringiensis is the source, not Agrobacterium (used for gene transfer). Similarly, understanding that GEAC is the regulatory body for GM research in India, not ICAR or CSIR, helps you tackle related questions confidently. If you scored less than 4 out of 6 in this section, revisit the NCERT chapter focusing on definitions, examples, and regulatory aspects. Use the CBSETUTOR.ai platform to upload a photo of any confusing question and receive step-by-step explanations from the AI tutor, available 24×7 at a flat ₹999/month for all classes 6–12, with a 3-day free trial to get started. Consistent practice with MCQs and immediate feedback loops significantly improve your objective question-solving speed and accuracy for the board exam.

Q1. (b) Bacillus thuringiensis — Bt toxin genes (cry genes) are isolated from this soil bacterium.
Q2. (a) Vitamin A (beta-carotene) — Golden Rice has been genetically modified to produce beta-carotene, addressing Vitamin A deficiency.
Q3. (c) Adenosine deaminase (ADA) deficiency — First gene therapy in 1990 for a 4-year-old girl with ADA deficiency using retroviral vectors.
Q4. (b) GEAC — Genetic Engineering Approval Committee under Ministry of Environment & Forests monitors GM research and approves releases.
Q5. (c) Direct human organ transplantation at present — Though research is ongoing, direct transplantation is not yet a clinical reality; pigs are studied for future xenotransplantation.
Q6. (b) Lepidopteran, coleopteran and dipteran insects — Cry proteins are insect group-specific; different cry genes target different insect orders.

Answer Key: Sections B, C, D, E and F

This consolidated answer key covers fill-in-the-blanks, match-the-following, true/false, short-answer, long-answer, and case-study questions. Each answer is crafted to match CBSE marking schemes, incorporating key terms, correct sequence, and sufficient detail for full marks. For fill-in-the-blanks, accept only NCERT-prescribed terms; for instance, the nematode is specifically Meloidogyne incognitia, not just 'a nematode'. In short answers, model responses demonstrate how to structure 2–3 mark answers concisely: define, explain mechanism, give example. Long answers show how to organise 5-mark responses into clear sub-headings or numbered points, ensuring comprehensive coverage without repetition. The case-study answers illustrate how to extract information from the passage and combine it with chapter knowledge to answer each sub-question precisely. True/False answers include explanations—knowing why a statement is false is as important as knowing it is false. Use this answer key as a self-assessment tool: award yourself marks honestly, noting where you lost marks due to incomplete answers, incorrect terminology, or missing examples. If your score is below 70%, schedule focused revision sessions using NCERT, make concise notes, and reattempt the worksheet after a week. For instant doubt resolution, CBSETUTOR.ai offers 24×7 AI-powered support where you can upload worksheet questions via photo and receive detailed solutions—all for ₹999/month across classes 6–12, with a 3-day free trial available. Regular worksheet practice combined with active answer-key review is the most effective strategy for mastering CBSE Class 12 Biology Chapter 10.

Q7. emphysema (caused by deficiency of alpha-1-antitrypsin, a protease inhibitor)
Q8. protoxin or inactive protoxin (activated by alkaline pH and proteases in insect gut)
Q9. Meloidogyne incognitia (tobacco-specific nematode; RNAi silences nematode genes)
Q10. retroviral (retrovirus used to insert functional ADA cDNA into patient lymphocytes)
Q11. living modified organisms or LMOs (protocol ensures safe transboundary movement)
Q12. Alzheimer's disease (or any other disease like cancer, cystic fibrosis, rheumatoid arthritis)
Q13–d, Q14–c, Q15–a, Q16–b
Q17. False (Bt toxin is inactive protoxin in bacteria; active only in insect gut)
Q18. True (GEAC indeed monitors GM research and release under Ministry of Environment & Forests)

How CBSETUTOR.ai Supports Chapter 10 Mastery

CBSETUTOR.ai is an AI-powered learning platform designed specifically for CBSE students in classes 6–12, offering 24×7 personalised tutoring at a flat ₹999 per month—one price for every class. For Chapter 10 Biotechnology and its Applications, students can upload photos of worksheet questions, NCERT exercises, or previous-year board questions and receive instant, step-by-step solutions. The AI tutor explains concepts like Bt toxin mechanism, gene therapy procedures, and transgenic animal applications in clear, simple language, adapting to each student's pace. Parents appreciate the platform's affordability and accessibility, eliminating the need for expensive home tuitions or coaching classes. The 3-day free trial allows students to explore the platform risk-free, experiencing how interactive Q&A, instant doubt clearing, and topic-wise practice can transform their preparation. Whether you struggle with memorising NCERT terminology, understanding application-based questions, or organising long answers, CBSETUTOR.ai provides targeted support exactly when needed. The platform also tracks progress, highlighting weak areas and suggesting focused revision. For a chapter as scoring and conceptually rich as Biotechnology and its Applications, having an on-demand AI tutor ensures no doubt remains unresolved and every question type is practised thoroughly. Visit CBSETUTOR.ai today, start your free trial, and experience how smart, personalised learning accelerates your journey toward board exam success.

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Tips for Scoring High in Chapter 10

Chapter 10 Biotechnology and its Applications is a high-scoring, application-oriented chapter in CBSE Class 12 Biology. To maximise marks, start by thoroughly reading NCERT, underlining key terms like Bt toxin, cry genes, ADA deficiency, retroviral vectors, GEAC, and RNAi. Make concise notes summarising each application—agriculture (Bt cotton, Golden Rice), medicine (gene therapy, insulin production), and transgenic animals. Practise drawing and labelling diagrams: gene therapy flowchart, mechanism of Bt toxin action, structure of a retroviral vector. These diagrams often carry 1–2 marks and are easy scoring opportunities. Memorise examples verbatim from NCERT—examiners reward precise terminology. For instance, write 'Bacillus thuringiensis' not just 'Bt bacteria', 'Meloidogyne incognitia' not 'nematode'. Solve previous years' board questions and sample papers to identify frequently asked topics; gene therapy, Bt crops, and transgenic animals appear almost every year. Time yourself while practising long answers—aim for 5-mark answers in 7–8 minutes. Use bullet points or numbered steps to structure answers clearly, making it easy for examiners to award marks. For case-study questions, underline key data in the passage and ensure your answers reference the passage while integrating NCERT knowledge. Revise regularly using flashcards for definitions and examples. Finally, use CBSETUTOR.ai for instant doubt resolution—upload tricky questions, get explanations, and reinforce learning through interactive AI support. Consistent, focused practice with this worksheet and similar resources will ensure you score confidently in Chapter 10.

Read NCERT Chapter 10 thoroughly; underline and note down all examples, definitions, and mechanisms.
Memorise exact terminology: Bacillus thuringiensis, Meloidogyne incognitia, adenosine deaminase, retroviral vector, GEAC.
Practise diagrams: gene therapy steps, Bt toxin mechanism, transgenic animal applications—label neatly for full marks.
Solve 5+ previous years' board questions; identify repeating topics like Bt crops, gene therapy, and ethical concerns.
Structure long answers using numbered points or subheadings; allocate 1 point per mark to ensure comprehensive coverage.
Attempt this worksheet under timed conditions (90 minutes) to build exam speed and identify weak areas for focused revision.

Frequently asked questions

How many marks does Chapter 10 Biotechnology and its Applications carry in CBSE Class 12 Biology board exam?+

Chapter 10 typically carries 4–5 marks in the CBSE Class 12 Biology board exam. Questions may include 1–2 MCQs (1 mark each), one short-answer question (2–3 marks), or part of a case-study question. Occasionally, a 5-mark long-answer question on applications of biotechnology in medicine or agriculture appears.

What are the most important topics in Chapter 10 for board exams?+

The most important topics are: Bt cotton and Bt toxin mechanism, Golden Rice and biofortification, transgenic animals and their uses, gene therapy (especially ADA deficiency treatment), RNA interference technology for nematode control, and biosafety concerns including the role of GEAC. These appear frequently in MCQs, short answers, and case studies.

How should I prepare diagrams for Chapter 10 Biotechnology and its Applications?+

Focus on three key diagrams: gene therapy procedure (vector, lymphocyte culture, reintroduction), mechanism of Bt toxin (protoxin, alkaline gut, pore formation), and transgenic animal applications (flowchart). Practise labelling neatly and writing brief explanatory notes alongside. Diagrams can fetch 1–2 marks and are often easy scoring opportunities if practised well.

Is the NCERT textbook enough for scoring full marks in Chapter 10?+

Yes, NCERT is sufficient for Chapter 10. All examples, definitions, and mechanisms asked in board exams are directly from NCERT Class 12 Biology. Read the chapter thoroughly, underline key terms, and practise NCERT exercise questions. Supplement with previous years' board questions and worksheets like this one for comprehensive practice and confidence building.

What is the difference between ex vivo and in vivo gene therapy?+

Ex vivo gene therapy involves removing cells (like lymphocytes or bone marrow) from the patient, introducing the functional gene using a vector in the lab, and returning corrected cells to the patient. In vivo gene therapy delivers the functional gene directly into the patient's body via vectors, without removing cells. Ex vivo is used for ADA deficiency treatment.

How can I remember the names of transgenic animals and their uses?+

Create a simple table: Rosie (cow) — human protein-enriched milk; transgenic mice — disease models for cancer, Alzheimer's; transgenic pig — organ transplant research; transgenic sheep — alpha-1-antitrypsin in milk. Use mnemonics: 'Rosie Makes Pretty Sheep' for Rosie-Mice-Pig-Sheep. Repeated writing and flashcard-based revision help lock these examples in memory for exam recall.

What is the role of GEAC mentioned in Chapter 10?+

GEAC (Genetic Engineering Approval Committee) functions under the Ministry of Environment and Forests, Government of India. It is responsible for approving activities involving large-scale use of genetically modified organisms, field trials, and releases into the environment. GEAC assesses safety and potential environmental impacts before granting permission, ensuring biosafety compliance.

How does Bt toxin remain inactive in the plant but become active in insects?+

Bt toxin is produced as an inactive protoxin in Bacillus thuringiensis and remains inactive in the plant. When an insect with an alkaline gut (pH ~9–10) ingests the plant tissue, gut proteases and alkaline pH convert the protoxin into its active form. The active toxin binds to specific receptors on the insect gut epithelium, forms pores, and kills the insect. Mammals have acidic guts and lack these receptors, so the toxin remains harmless.

Can I score full marks in long-answer questions without NCERT examples?+

No, CBSE examiners expect specific NCERT examples in long-answer questions. Generic statements like 'biotechnology helps agriculture' score poorly. You must cite Bt cotton for pest resistance, Golden Rice for vitamin A enrichment, or rosie the cow for human protein production. Including precise examples and terminology signals thorough preparation and aligns with the marking scheme, ensuring full marks.

How does CBSETUTOR.ai help with Chapter 10 preparation?+

CBSETUTOR.ai offers 24×7 AI-powered tutoring at ₹999/month for all classes 6–12. Upload photos of worksheet questions, NCERT exercises, or doubts from Chapter 10 and receive instant, step-by-step solutions. The AI tutor explains Bt toxin mechanism, gene therapy, transgenic animals, and biosafety in simple language. A 3-day free trial lets you explore the platform risk-free, making it ideal for doubt clearing and exam revision.

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