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CBSE Class 11 Biology Chapter 12 Respiration in Plants Worksheet with Answers
Respiration in Plants is a cornerstone chapter in CBSE Class 11 Biology that explores how plants harvest energy stored in glucose. This printable worksheet provides structured practice across all question types—MCQs, fill-in-the-blanks, matching, short and long answers—covering glycolysis, Krebs cycle, electron transport chain, and respiratory quotient. Designed for students aiming to master NCERT Class 11 Biology Chapter 12, this resource helps reinforce metabolic pathways and prepares learners for board exams and competitive tests like NEET.
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Key takeaways
- ✓Worksheet contains 40+ NCERT-aligned questions covering glycolysis, Krebs cycle, ETC, and respiratory quotient from Chapter 12
- ✓Difficulty level: Moderate to Challenging; Suggested time: 90 minutes for complete worksheet
- ✓Section-wise practice includes 8 MCQs, 6 fill-in-the-blanks, 8 matching pairs, 5 short answers, and 3 long-answer HOTS questions
- ✓One case-study question integrates real-world application of respiration concepts for deeper understanding
- ✓Complete answer key with explanations provided for every question to enable self-assessment
- ✓Questions follow latest CBSE pattern and emphasise metabolic pathway mechanisms tested in board exams
- ✓Ideal for revision before unit tests, term exams, and NEET preparation for Plant Physiology section
Chapter 12 Quick Recap: Respiration in Plants
Respiration in Plants is the biochemical process through which plants oxidise organic compounds to release energy in the form of ATP. Unlike photosynthesis, respiration occurs continuously in all living cells, day and night. The chapter covers aerobic respiration in detail—glycolysis (cytoplasmic breakdown of glucose to pyruvate), Krebs cycle (mitochondrial oxidation of acetyl CoA), and electron transport chain (ETC, the major ATP-generating phase). Anaerobic respiration, fermentation, and the concept of respiratory quotient (RQ = CO₂ evolved / O₂ consumed) are also explained. The amphibolic nature of respiration, involvement of alternate substrates like fats and proteins, and the energetics (net gain of 36-38 ATP per glucose molecule) form the conceptual core. Understanding enzyme roles, coenzymes like NAD⁺ and FAD, and mitochondrial structure is essential for mastering this chapter.
- Glycolysis: Occurs in cytoplasm, converts one glucose to two pyruvate molecules, net gain of 2 ATP and 2 NADH+H⁺
- Krebs cycle: Matrix of mitochondria, acetyl CoA oxidised to CO₂, produces 3 NADH, 1 FADH₂, 1 GTP per turn
- ETC: Inner mitochondrial membrane, electron carriers transfer electrons, chemiosmotic ATP synthesis yields ~34 ATP
- Respiratory Quotient (RQ): Carbohydrates RQ=1, Fats RQ~0.7, Proteins RQ~0.9; useful in diet analysis
Section A: Multiple Choice Questions (MCQs)
This section contains 8 NCERT-aligned multiple-choice questions testing core concepts from Respiration in Plants. Each MCQ has four options with one correct answer. These questions mirror the pattern seen in CBSE Class 11 term exams and NEET, focusing on glycolysis, Krebs cycle, electron transport chain, and respiratory quotient. Students should attempt these in 12-15 minutes. Carefully read each stem and eliminate incorrect options systematically. Check your answers against the answer key provided at the end of the worksheet to identify knowledge gaps and revise accordingly.
Section B: Fill in the Blanks
This section includes 6 fill-in-the-blank statements that test recall of specific terms, enzymes, and numerical values from NCERT Class 11 Biology Chapter 12. Blanks cover key vocabulary such as coenzymes, substrates, products, and locations of metabolic reactions. Students should complete this section in 8-10 minutes. Use your NCERT textbook terminology precisely. After completion, verify each answer in the answer key and revisit the relevant NCERT page if you made an error. This exercise strengthens memory and prepares you for definition-based questions in board exams.
Section C: Match the Following
Match the items in Column A with the most appropriate option in Column B. This section has 8 pairs designed to test your understanding of enzymes, intermediates, and stages of respiration. Matching questions are common in CBSE practicals and theory exams. Allocate 10 minutes for this section. Write the correct letter corresponding to each number. Cross-check your answers with the answer key and note any mismatches for targeted revision. Understanding these associations deepens comprehension of the sequential nature of respiratory pathways.
Section D: Short Answer Questions (3 marks each)
This section contains 5 short-answer questions, each carrying 3 marks and requiring 40-60 word answers. These questions test conceptual clarity, ability to explain processes, and recall of pathway details. Students should spend around 20-25 minutes on this section. Write in points wherever possible for clarity. Use NCERT terminology such as 'substrate-level phosphorylation', 'oxidative decarboxylation', and 'chemiosmotic hypothesis'. After attempting, compare your answers with the answer key to check completeness and accuracy. Practice writing concise, structured answers to maximise marks in board exams.
Section E: Long Answer and HOTS Questions (5 marks each)
This section features 3 long-answer and higher-order thinking skills (HOTS) questions, each worth 5 marks. Answers should be 120-150 words with labelled diagrams where applicable. Expect to spend 25-30 minutes here. These questions assess your ability to integrate information across glycolysis, Krebs cycle, and ETC, explain energetics, and apply concepts to novel scenarios. Structure your answers with an introduction, body in points, and a concluding statement. Use flow charts or schematic diagrams to illustrate pathways. Compare your responses with the detailed answer key to refine explanation skills essential for scoring full marks in CBSE board exams.
Section F: Case Study Question
This case-study question presents a real-world or experimental scenario followed by 4 sub-questions (1 mark each). Case studies test your ability to apply Chapter 12 concepts to interpret data, predict outcomes, and justify reasoning. Allocate 10-12 minutes for this section. Read the passage carefully, underline key information, and answer each sub-question precisely. Such questions are increasingly common in CBSE board papers and NEET to assess analytical and interpretive skills. The answer key provides the rationale for each sub-question, helping you understand the application of theory to practical contexts.
Complete Answer Key with Explanations
Below is the full answer key for all sections of the worksheet. Each answer includes a brief explanation or rationale to help you understand the correct response and learn from mistakes. Use this key only after attempting all questions independently. For MCQs and objective questions, note the reasoning behind each answer. For short and long answers, compare your structure and content with the model answers. If you score below 70 percent, revisit the relevant NCERT sections and your Class 11 Biology notes. Regular practice with such worksheets builds confidence and ensures thorough preparation for CBSE board exams and entrance tests like NEET.
How CBSETUTOR.ai Supports Class 11 Biology Mastery
Mastering Respiration in Plants and other Class 11 Biology chapters requires consistent practice, doubt resolution, and access to quality resources. CBSETUTOR.ai offers a 24×7 AI-powered tutor that helps students clarify doubts instantly by uploading photos of questions from worksheets, NCERT exercises, or reference books. Whether you are stuck on the mechanism of the Krebs cycle or calculating net ATP yield, the AI tutor provides step-by-step explanations aligned with CBSE and NCERT guidelines. At a flat fee of ₹999 per month covering all subjects for classes 6-12, it is an affordable alternative to expensive coaching. Students also get access to curated worksheets, chapter-wise tests, and performance analytics. A 3-day free trial allows you to experience the platform before committing. With CBSETUTOR.ai, you gain a personalised learning companion that adapts to your pace and strengthens conceptual understanding across Biology, Chemistry, Physics, and Mathematics.
- Upload photo of any Biology question and receive detailed, NCERT-aligned solutions within seconds
- Access topic-wise worksheets, MCQ quizzes, and previous years' board question papers for Chapter 12
- Track progress with performance analytics highlighting strong and weak areas in Plant Physiology
- ₹999/month flat fee covers all subjects (classes 6-12); 3-day free trial with no payment details required
Tips for Using This Worksheet Effectively
To maximise learning from this Respiration in Plants worksheet, follow a structured approach. First, set a timer for 90 minutes and attempt the worksheet in exam-like conditions without referring to notes or NCERT. This simulates board exam pressure and builds time-management skills. After completion, take a 10-minute break, then review your answers against the answer key section by section. For each mistake, write a one-line reason why you got it wrong—conceptual gap, careless reading, or incomplete NCERT coverage. Revisit those specific NCERT pages and make concise notes. Reattempt incorrect questions after two days to check retention. Use different coloured pens to mark first attempt, corrections, and final reattempt. Share your scores with a study group or teacher for feedback. Regular worksheet practice, combined with NCERT reading and diagram drawing, ensures thorough preparation for both board exams and competitive entrance tests like NEET, where Plant Physiology carries significant weightage.
- Attempt the worksheet in one sitting under timed conditions to build exam stamina and speed
- Review answers immediately after attempting and categorise errors—concept, silly mistake, or incomplete knowledge
- Create a 'mistake log' notebook and write correct answers with brief explanations for future quick revision
- Reattempt wrong questions after 48 hours to test retention and reinforce learning
- Draw and label diagrams for glycolysis, Krebs cycle, and ETC from memory to strengthen visual recall
Frequently asked questions
What is the difficulty level and suggested time for this Respiration in Plants worksheet?+
The worksheet is moderate to challenging, designed for CBSE Class 11 students who have completed NCERT Chapter 12. The suggested time is 90 minutes for all sections. Allocate approximately 15 minutes for MCQs, 10 minutes for fill-in-the-blanks, 10 minutes for matching, 25 minutes for short answers, 30 minutes for long answers, and 10 minutes for the case study.
How many questions are included in this Class 11 Biology Chapter 12 worksheet?+
The worksheet contains over 40 questions across six sections: 8 MCQs, 6 fill-in-the-blanks, 8 matching pairs, 5 short-answer questions (3 marks each), 3 long-answer or HOTS questions (5 marks each), and 1 case study with 4 sub-questions. This variety ensures comprehensive coverage of all question types seen in CBSE board exams.
Is an answer key provided with explanations for every question?+
Yes, a complete answer key with brief explanations is included at the end of the worksheet. Each MCQ, fill-in-the-blank, and matching answer is explained with reasoning. Model answers for short and long questions are provided to guide you on structure, content, and NCERT terminology, enabling effective self-assessment and learning from mistakes.
Which topics from NCERT Class 11 Biology Chapter 12 are covered in this worksheet?+
The worksheet covers all major topics from Respiration in Plants: glycolysis (pathway, enzymes, ATP yield), Krebs cycle (intermediates, decarboxylation steps), electron transport chain and oxidative phosphorylation, respiratory quotient (RQ values for different substrates), anaerobic respiration and fermentation, and the amphibolic nature of respiration. Questions are aligned with NCERT content and CBSE exam patterns.
Can I use this worksheet for NEET preparation along with CBSE board exam practice?+
Absolutely. This worksheet is ideal for both CBSE Class 11 board exam preparation and NEET. The Plant Physiology section, including Respiration in Plants, is important in NEET Biology. The MCQs, case study, and HOTS questions mirror the analytical and application-based format of NEET, while short and long answers prepare you for board descriptive questions.
How should I approach the case study question in Section F?+
Read the case study passage carefully and underline key numerical data or observations. Each sub-question tests your ability to interpret the scenario using Chapter 12 concepts. For example, identifying substrate type from RQ values or predicting anaerobic pathways. Answer each sub-question independently, referring back to the passage. Check the answer key for reasoning and ensure you understand the application of theory.
What is the importance of the respiratory quotient (RQ) covered in this worksheet?+
Respiratory quotient (RQ) is the ratio of the volume of CO₂ evolved to the volume of O₂ consumed during respiration. It indicates the type of substrate being oxidised: RQ = 1.0 for carbohydrates, ~0.7 for fats, and ~0.9 for proteins. Understanding RQ helps analyse metabolic states, diet composition, and energy yield. Multiple questions in the worksheet test RQ calculations and interpretation.
How can I improve my answers for long-answer questions in Section E?+
For 5-mark long answers, structure your response with an introductory statement, body in numbered points or sub-headings, and a conclusion if relevant. Use NCERT terminology precisely (for example, 'substrate-level phosphorylation', 'chemiosmotic hypothesis'). Include labelled diagrams wherever possible—such as the steps of glycolysis or a schematic of ETC. Compare your answers with the answer key to identify gaps in explanation or missing key points.
Where does glycolysis occur and what is the net ATP yield?+
Glycolysis occurs in the cytoplasm of the cell. One molecule of glucose is broken down into two molecules of pyruvate. The gross ATP production is 4 ATP, but 2 ATP are consumed in the preparatory phase, giving a net gain of 2 ATP. Additionally, 2 NADH+H⁺ molecules are produced, which can yield more ATP in the electron transport chain during aerobic respiration.
How does CBSETUTOR.ai help with doubts from this worksheet?+
CBSETUTOR.ai provides a 24×7 AI tutor accessible via photo upload. If you are stuck on any question—such as explaining the amphibolic nature of respiration or drawing the Krebs cycle—simply snap a picture and upload it. The AI tutor delivers step-by-step NCERT-aligned explanations instantly. At ₹999/month for all subjects (classes 6-12), with a 3-day free trial, it is a cost-effective way to resolve doubts anytime, anywhere, without waiting for a tutor or coaching class.
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