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CBSE Class 11 Important Questions Biology
By Swati Singh
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Updated on 11 Jul 2025, 15:25 IST
CBSE Important Questions for Class 11 Biology are made by expert teachers to help students prepare well for their exams. Biology is a key subject that explains life and living things in detail. Students preparing for competitive exams like NEET need to understand Biology deeply.
This page gives students extra important questions to practice and check how much they know. These questions will be helpful for both school exams and competitive tests.
CBSE Class 11 Important Questions Biology - Chapter wise
| Chapter No. | Chapter Name | Key Questions |
| 1 | Diversity of Living Organisms | Define taxonomy; What is the three-domain system? |
| 2 | Biological Classification | List characteristics of Kingdom Monera and Protista. |
| 3 | Plant Kingdom | Explain life cycles in bryophytes and pteridophytes. |
| 4 | Animal Kingdom | Classify animals based on symmetry and body cavity. |
| 5 | Morphology of Flowering Plants | Describe root, stem, leaf modifications. |
| 6 | Anatomy of Flowering Plants | Differentiate between dicot and monocot stem anatomy. |
| 7 | Structural Organisation in Animals | Label parts of cockroach anatomy; types of tissues. |
| 8 | Cell: The Unit of Life | Explain structure and function of cell organelles. |
| 9 | Biomolecules | Define enzymes; Distinguish carbohydrates and proteins. |
| 10 | Cell Cycle and Cell Division | Stages of mitosis and meiosis with diagrams. |
| 11 | Transport in Plants | Explain transpiration, diffusion, and active transport. |
| 12 | Mineral Nutrition | List essential nutrients; What is nitrogen fixation? |
| 13 | Photosynthesis in Higher Plants | Describe light and dark reactions with diagrams. |
| 14 | Respiration in Plants | Explain glycolysis, Kreb’s cycle, and ATP formation. |
| 15 | Plant Growth and Development | Define growth regulators and phases of growth. |
| 16 | Digestion and Absorption | Explain digestive system and absorption process. |
| 17 | Breathing and Exchange of Gases | Describe respiratory system and gas transport. |
| 18 | Body Fluids and Circulation | Explain blood components and heart structure. |
| 19 | Excretory Products and Their Elimination | Structure of nephron and steps of urine formation. |
| 20 | Locomotion and Movement | Explain muscles and types of movement. |
| 21 | Neural Control and Coordination | Structure and function of neuron; reflex arc. |
| 22 | Chemical Coordination and Integration | List glands and hormones; their roles in body. |
Some Important Questions with Solutions from Class 11 Biology
1. What is the hierarchy of classification?
Solution: Kingdom → Phylum → Class → Order → Family → Genus → Species
2. Define binomial nomenclature.
Solution: It is a system of naming organisms using two Latin names: the Genus (capitalized) and the Species (lowercase). Example: Homo sapiens
3. Differentiate between prokaryotic and eukaryotic cells.
Solution: Prokaryotic cells lack a nucleus and are simple (e.g., bacteria). Eukaryotic cells have a nucleus and complex organelles (e.g., plant cells).
4. What are the main characteristics of Monera?
Solution: Unicellular, prokaryotic, have a cell wall, reproduce asexually. Examples: E. coli, Streptococcus.
5. Name the four major plant groups.
Solution: Algae, Bryophytes, Pteridophytes, Gymnosperms/Angiosperms
6. Define symmetry in animals with examples.
Solution: Radial symmetry (e.g., starfish), Bilateral symmetry (e.g., humans)
7. What is a fibrous root system?
Solution: A root system with thin roots growing from the stem base. Common in monocots like grass.
8. What is the function of xylem and phloem?
Solution: Xylem transports water. Phloem transports food/sugar.
9. Name any four types of animal tissues.
Solution: Epithelial, Connective, Muscular, Nervous
10. Define plasmolysis.
Solution: Shrinking of cytoplasm when a plant cell is placed in a hypertonic solution.
11. What is the function of mitochondria?
Solution: Produces ATP (energy). Known as the powerhouse of the cell.
12. What are enzymes?
Solution: Enzymes are biological catalysts that speed up chemical reactions in the body.
13. Define the term 'metabolism'.
Solution: Sum of all chemical reactions in the body, including anabolic and catabolic processes.
14. What are the stages of the cell cycle?
Solution: Interphase (G1, S, G2), M Phase (Mitosis/Meiosis), Cytokinesis
15. What is transpiration?
Solution: Loss of water vapor through stomata from the aerial parts of the plant.
16. Name two macronutrients required by plants.
Solution: Nitrogen (N), Potassium (K)
17. What are the products of photosynthesis?
Solution: Glucose (C₆H₁₂O₆) and Oxygen (O₂)
18. What is glycolysis?
Solution: The breakdown of glucose into pyruvate in the cytoplasm. First step of respiration.
19. Name any two plant growth regulators.
Solution: Auxins (cell growth), Gibberellins (stem elongation, seed germination)
20. What is the role of bile in digestion?
Solution: Bile helps in fat digestion by breaking down fats into small droplets (emulsification).
21. What is tidal volume?
Solution: Volume of air inhaled or exhaled in a normal breath (~500 mL).
22. Define double circulation in humans.
Solution: Blood passes twice through the heart – once for oxygenation and once for distribution to the body.
23. What is the role of nephron?
Solution: Nephron filters blood and forms urine through filtration, reabsorption, and secretion.
24. Differentiate between voluntary and involuntary muscles.
Solution: Voluntary: under control (e.g., skeletal); Involuntary: not under control (e.g., cardiac, smooth muscles).
25. What is a reflex arc?
Solution: A neural pathway that controls reflex action, involving a receptor, sensory neuron, CNS, motor neuron, and effector.
CBSE Class 11 Biology Important Questions – Chapter Summary
Chapter 1: The Living World: Focus on definitions: species, taxonomy, and nomenclature. Key questions include importance of classification, binomial nomenclature, and taxonomic categories.
Chapter 2: Biological Classification: Covers five-kingdom classification, Monera to Animalia. Important for differences between kingdoms and characteristics of viruses, bacteria, fungi, and protists.
Chapter 3: Plant Kingdom: Emphasis on classification: Algae, Bryophytes, Pteridophytes, Gymnosperms, Angiosperms. Important questions cover life cycles and alternation of generations.
Chapter 4: Animal Kingdom: Learn levels of organization, symmetry, coelom, and classification up to phylum level. Focus on distinguishing features of Porifera, Cnidaria, Platyhelminthes, etc.
Chapter 5: Morphology of Flowering Plants: Includes root, stem, leaf, flower, fruit, and seed structure. Key questions revolve around types of roots and leaf modifications.
Chapter 6: Anatomy of Flowering Plants: Important topics: tissues, secondary growth, and anatomy of monocots vs dicots. Diagrams and structure-based questions are commonly asked.
Chapter 7: Structural Organisation in Animals: Focus on animal tissues, and structure of earthworm, frog, and cockroach. Important for diagrams and tissue functions.
Chapter 8: Cell – The Unit of Life: Covers prokaryotic vs eukaryotic cells, cell organelles. Essential for structural and functional roles of organelles like mitochondria, ER, nucleus.
Chapter 9: Biomolecules: Learn carbohydrates, proteins, lipids, nucleic acids. Important questions on enzymes, their types, properties, and examples.
Chapter 10: Cell Cycle and Cell Division: Stages of mitosis and meiosis, differences between them. Diagrams and sequence-based questions are important.
Chapter 11: Transport in Plants: Covers diffusion, osmosis, transpiration, water and mineral absorption. Questions often involve mechanisms and experiments like root pressure, cohesion-tension theory.
Chapter 12: Mineral Nutrition: Focus on essential elements, deficiency symptoms, nitrogen cycle. Frequently asked: biological nitrogen fixation and role of leguminous plants.
Chapter 13: Photosynthesis in Higher Plants: Includes light reaction, dark reaction (Calvin cycle). Conceptual and equation-based questions are crucial.
Chapter 14: Respiration in Plants: Learn about aerobic and anaerobic respiration, glycolysis, Krebs cycle. Energy yield and site of reactions are commonly tested.
Chapter 15: Plant Growth and Development: Focus on growth phases, plant hormones (auxin, gibberellin, cytokinin), and photoperiodism. Conceptual questions based on experiments and regulators.
Chapter 16: Digestion and Absorption: Important systems: alimentary canal, digestive glands. Function of enzymes, nutrient absorption sites.
Chapter 17: Breathing and Exchange of Gases: Emphasis on human respiratory system, mechanism of breathing, and gas exchange. Learn about oxygen dissociation curve and respiratory volumes.
Chapter 18: Body Fluids and Circulation: Covers structure of heart, blood vessels, lymph, cardiac cycle. ECG and blood group-related questions are important.
Chapter 19: Excretory Products and Their Elimination: Nephron structure, urine formation, role of ADH. Important for functions and regulation of kidney.
Chapter 20: Locomotion and Movement: Learn muscle types, sliding filament theory, and joints. Conceptual diagrams and definitions appear often.
Chapter 21: Neural Control and Coordination: Structure and function of neuron, reflex arc, brain parts. Questions may involve action potential and coordination mechanisms.
Chapter 22: Chemical Coordination and Integration: Focus on endocrine glands and hormones. Learn hormone disorders, feedback mechanisms, and glands with dual roles.
FAQs on CBSE Class 11 Important Questions Biology
What are important questions in Class 11 Biology?
Important questions in Class 11 Biology are carefully selected from each chapter based on previous year papers, NCERT patterns, and exam relevance. These cover essential topics like classification, cell biology, plant physiology, and human physiology to help students revise key areas effectively.
Are NCERT questions enough for Class 11 Biology exam preparation?
NCERT textbooks form the core of the CBSE syllabus and are very important. However, solving important questions gives extra practice, covers application-based questions, and strengthens your understanding of key concepts.
Where can I find chapter-wise important questions for Class 11 Biology?
You can find them:
In NCERT Exemplar books
On CBSE sample papers and previous year question papers
From educational websites like Infinity Learn, which offer chapter-wise questions with solutions in PDF format
How do important questions help in exam preparation?
Important questions:
Highlight frequently tested topics
Improve time management and confidence
Help in quick revision before exams
Prepare students for both theory and application-based questions
Which chapters in Class 11 Biology are most important for exams?
Some high-weightage and concept-rich chapters include:
Cell: The Unit of Life
Plant Physiology (Photosynthesis, Transport in Plants)
Human Physiology (Digestion, Breathing, Circulation)
Biomolecules
- Biological Classification
Do important questions help in NEET and other competitive exams?
Yes. Class 11 Biology forms the base of NEET and other medical entrance exams. Practicing important questions early builds strong conceptual clarity, which is vital for MCQ-based competitive tests.
Can I use important questions for last-minute revision?
Absolutely. Important questions are perfect for last-minute revision because they focus only on the most relevant and scoring topics, saving time while ensuring coverage of key areas.
How many important questions should I practice from each chapter?
Ideally, solve:
10–15 questions per chapter for basic preparation
- 20–30 questions per chapter if you're preparing for NEET or aiming for high scores