Biology — Exercise Solutions Guide
CBSE Class 11 Biology covers 22 chapters across five units: Diversity of Living Organisms, Structural Organisation in Plants and Animals, Cell: Structure and Function, Plant Physiology, and Human Physiology. Biology questions test concept clarity, diagram labelling, keyword usage, and answer structure. Read the question carefully before writing.
Answer Pattern
1. Identify the question type — definition, short answer, long answer, diagram-based, or assertion-reason. 2. Write the key concept or definition first. 3. Add explanation, examples, or labelled diagrams as needed. 4. Conclude with a clear final statement that directly answers what was asked.
Chapter-wise Quick Reference
| Chapter | Title | Key Topics |
|---|---|---|
| 1 | The Living World | Classification, taxonomy, binomial nomenclature |
| 2 | Biological Classification | Five-kingdom system, Monera, Protista, Fungi, Plantae, Animalia |
| 3 | Plant Kingdom | Algae, Bryophytes, Pteridophytes, Gymnosperms, Angiosperms |
| 4 | Animal Kingdom | Basis of classification, invertebrate and vertebrate phyla |
| 5 | Morphology of Flowering Plants | Root, stem, leaf, flower, fruit, seed, families |
| 6 | Anatomy of Flowering Plants | Tissue systems, monocot vs dicot anatomy, secondary growth |
| 7 | Structural Organisation in Animals | Animal tissues, earthworm, cockroach, frog anatomy |
| 8 | Cell: The Unit of Life | Cell theory, prokaryotic vs eukaryotic, cell organelles |
| 9 | Biomolecules | Proteins, carbohydrates, lipids, nucleic acids, enzymes |
| 10 | Cell Cycle and Cell Division | Mitosis, meiosis, significance, phases |
| 11 | Transport in Plants | Diffusion, osmosis, water potential, transpiration, ascent of sap |
| 12 | Mineral Nutrition | Essential elements, nitrogen fixation, hydroponics |
| 13 | Photosynthesis in Higher Plants | Light reactions, Calvin cycle, C3/C4, photorespiration |
| 14 | Respiration in Plants | Glycolysis, Krebs cycle, ETC, fermentation, RQ |
| 15 | Plant Growth and Development | Growth phases, auxins, gibberellins, cytokinins, ABA, ethylene, photoperiodism, vernalisation |
| 16 | Digestion and Absorption | Alimentary canal, digestion steps, absorption, disorders |
| 17 | Breathing and Exchange of Gases | Respiratory organs, mechanism of breathing, gas exchange, transport of O₂ and CO₂ |
| 18 | Body Fluids and Circulation | Blood, blood groups, coagulation, double circulation, cardiac cycle, ECG |
| 19 | Excretory Products and their Elimination | Kidney structure, nephron, urine formation, dialysis |
| 20 | Locomotion and Movement | Skeletal system, joints, muscles, disorders |
| 21 | Neural Control and Coordination | Neuron, synapse, CNS, PNS, reflex arc, sense organs |
| 22 | Chemical Coordination and Integration | Endocrine glands, hormones, hypothalamus, pituitary, thyroid, pancreas, adrenal |
Short Answer Points
- Read the NCERT chapter thoroughly before attempting exercises.
- Write answers in your own words while keeping NCERT keywords intact.
- Draw and label diagrams wherever the question permits — especially for Cell, Anatomy, and Physiology chapters.
- For definition questions, use the exact NCERT wording.
- For long-answer questions, structure your response: definition → explanation → example → conclusion.
Exam Tips
- Time yourself while solving exercises to improve speed.
- Mark questions you found difficult and revisit them after a week.
- Compare your answers with the NCERT answer key for accuracy.
- Practise previous year board questions for the same chapters.
- Diagrams carry marks — always label them fully.
- Assertion-reason questions need you to evaluate both statements independently before linking them.
Frequently Asked Questions
Attempt the questions on your own first, then check the answer pattern here. Focus on the method, keywords, and format rather than copying verbatim.