Most students searching for the 8th std biology question paper are looking for one of two things. Either they want a previous year paper to practice with before the exam, or they want to understand what kinds of questions appear and how the paper is structured. Both are valid, and both have the same problem: most pages you will find give you a download link with no context.
Here is the thing that actually matters. Biology in Class 8 is not a standalone subject for most boards. Under CBSE and many state boards, it is part of the integrated Science paper along with Physics and Chemistry. Under ICSE, Biology is a separate subject called Biology Paper 1 and Paper 2. Under Kerala Board, it falls under Basic Science. Under AP and Telangana state boards, it is again part of a combined Science paper.
This guide covers all four. You will find the exact biology chapters tested in each board’s 8th std question paper, the marks distribution, the question types that appear most often, model questions with the expected level of detail, a strategy for diagram-based questions, and where to download free papers and answer keys.
Which Board Are You Studying Under? The Answer Changes Everything
The term 8th std biology question paper means completely different things depending on which board your school follows. Before downloading or practicing any paper, confirm your board. The biology content, paper format, marks, and even the textbook used are all different.
| Board | Biology Status | Textbook | Total Marks |
| CBSE | Part of Science paper | NCERT Science Class 8 | Biology approx 25-30 of 80 marks |
| ICSE | Separate subject | Ratna Sagar / Selina Biology | 80 marks standalone |
| Kerala Board (SCERT) | Part of Basic Science paper | SCERT Kerala Science Class 8 | Biology portion approx 25 of 60 marks |
| AP and TS State Boards | Part of Science paper | AP/TS SCERT Class 8 Science | Biology approx 25-30 marks |
| Maharashtra Board | Part of Science and Technology | Balbharati Class 8 Science | Biology approx 25 marks |
| Karnataka Board | Part of Science paper | Karnataka SCERT Class 8 | Biology approx 25 marks |
The detailed sections below cover CBSE, ICSE, and Kerala Board in full depth since these are the three most searched boards for 8th std biology question papers. AP and TS board students will find the CBSE section most applicable since question patterns and chapter structures are closely aligned.
CBSE 8th Std Biology Question Paper: Chapters, Pattern and Marks
For CBSE students, biology is not a separate exam. It is a set of chapters within the Science paper. The Science paper is 80 marks written plus 20 marks practical and internal assessment. Biology chapters typically account for 25 to 30 marks of the 80 mark paper.
CBSE Class 8 Biology Chapters (NCERT Science)
| Chapter | Key Topics | Typical Marks |
| Ch 1: Crop Production and Management | Agricultural practices, kharif and rabi crops, irrigation, fertilisers, pest control | 4 to 5 marks |
| Ch 2: Microorganisms: Friend and Foe | Types of microorganisms, uses, diseases caused, food preservation, nitrogen fixation | 4 to 5 marks |
| Ch 5: Conservation of Plants and Animals | Deforestation, biosphere reserve, national parks, sanctuaries, Red Data Book, migration | 3 to 4 marks |
| Ch 7: Cell: Structure and Functions | Cell theory, parts of the cell, plant vs animal cell, unicellular vs multicellular | 5 to 6 marks |
| Ch 9: Reproduction in Animals | Sexual and asexual reproduction, external and internal fertilisation, metamorphosis | 4 to 5 marks |
| Ch 10: Reaching the Age of Adolescence | Puberty, hormones, endocrine glands, secondary sexual characters, reproductive health | 3 to 4 marks |
CBSE Class 8 Science Paper Structure (Biology Questions)
| Question Type | Biology Questions Typically Included |
| MCQ and Very Short Answer (1 mark) | Define terms, fill in blank, true or false. Example: Name the hormone responsible for growth in humans. |
| Short Answer Type I (2 marks) | Two-point answers. Example: List two uses of microorganisms in food production. |
| Short Answer Type II (3 marks) | Three points or a small diagram. Example: Explain metamorphosis with a diagram. |
| Long Answer or HOTs (4 to 5 marks) | Detailed explanation with labelled diagram. Example: Draw a labelled animal cell and describe three organelle functions. |
High-Weightage Biology Topics for CBSE Class 8
- Cell structure and function: Diagram of plant and animal cell is the most commonly asked diagram question. Differences between plant and animal cells is a standard 3-mark question.
- Microorganisms: Uses in food, medicine, and industry appear in almost every paper. Diseases caused by microorganisms is another consistent question type.
- Reproduction in animals: Sexual and asexual reproduction comparison, external and internal fertilisation, and metamorphosis stages are high-frequency topics.
- Conservation: Definitions of biosphere reserve, national park, and wildlife sanctuary appear as 1-mark questions. Causes and effects of deforestation is a common 3-mark question.
- Adolescence: Changes during puberty, role of hormones, and balanced diet during adolescence appear regularly in both mid-term and annual papers.
ICSE 8th Std Biology Question Paper: Separate Subject, Separate Depth
ICSE schools treat Biology as a completely separate subject for Class 8. The ICSE Class 8 Biology paper is 80 marks with a duration of 2 to 2.5 hours. The syllabus is more detailed and the questions require more written explanation than in CBSE papers.
ICSE Class 8 Biology Syllabus and Chapter Overview
| Chapter / Unit | Key Topics |
| Transport of Food and Minerals in Plants | Xylem, phloem, transpiration, osmosis, photosynthesis pathway |
| Reproduction in Plants | Vegetative propagation, pollination, fertilisation, seed dispersal |
| Respiration in Plants | Aerobic and anaerobic respiration, gaseous exchange, stomata |
| The Nervous System | Structure of neuron, CNS and PNS, reflex action, sense organs |
| The Endocrine System | Endocrine glands, hormones and functions, feedback mechanism |
| The Excretory System | Organs of excretion, kidney structure, urine formation, dialysis |
| The Reproductive System | Male and female reproductive systems, fertilisation, embryo development |
| Food and Nutrition | Balanced diet, deficiency diseases, nutrition in plants and animals |
| Diseases and First Aid | Communicable and non-communicable diseases, prevention, basic first aid |
| Health and Hygiene | Personal hygiene, environmental health, immunisation |
ICSE Class 8 Biology Paper Format
| Section | Description and Marks |
| Section A: Objective Questions | MCQ, true or false, fill in blank, match the column. Typically 20 marks. No internal choice. |
| Section B: Short Answer Questions | 2 to 3 marks per question. Answer in 2 to 4 sentences. Diagram may be required. Typically 30 marks. |
| Section C: Long Answer Questions | 5 to 6 marks per question. Detailed explanation with labelled diagrams. Typically 30 marks. Internal choice given. |
| Total | 80 marks written | Duration: 2 to 2.5 hours |
What Makes ICSE Biology Different from CBSE
- ICSE requires more written detail. A 3-mark answer in CBSE might need two sentences. The same question in ICSE expects a structured paragraph with clear distinct points.
- ICSE has a stronger emphasis on diagrams. Papers consistently include at least 2 to 3 mandatory diagram questions. Unlabelled or poorly labelled diagrams lose significant marks.
- ICSE tests the nervous system and endocrine system in Class 8, which CBSE covers only in Class 10. These are high-mark topics unique to ICSE at 8th standard.
- ICSE Class 8 Biology uses Ratna Sagar or Selina Biology textbooks. Questions are framed from these books specifically. NCERT is insufficient preparation for ICSE biology.
Kerala Board 8th Std Biology Question Paper: Basic Science Format
For students in Kerala, biology appears as part of the Basic Science paper rather than as a standalone subject. The Basic Science paper for Class 8 integrates Physics, Chemistry, and Biology into one paper. The Kerala SCERT Class 8 Basic Science paper carries 60 marks written plus 20 marks internal assessment.
Kerala SCERT Class 8 Biology Chapters
| Chapter | Key Topics |
| Living World and Classification | Characteristics of living organisms, five-kingdom classification, binomial nomenclature |
| Cell: The Basic Unit of Life | Cell theory, plant and animal cell comparison, organelles and their functions |
| Microorganisms | Bacteria, viruses, fungi, protozoa, beneficial and harmful microorganisms |
| From Food to Energy | Nutrition in plants and animals, photosynthesis, digestion, respiration |
| Heredity and Evolution | Basics of inheritance, Mendel’s experiments, adaptation, evolution overview |
| Ecosystem and Environment | Components of ecosystem, food chains and food webs, ecological balance |
| Human Health and Disease | Types of diseases, immunity, vaccines, common diseases and prevention |
| Reproduction | Asexual and sexual reproduction, pollination, fertilisation in plants and animals |
Kerala Board Class 8 Biology Paper Characteristics
- Activity-based questions: Instead of listing facts, students are given scenarios or diagrams and asked to reason through them. Example: Observe the given fermentation diagram and explain what is happening at step 2.
- Observation and inference questions: Students are given a situation and asked to name the biological process involved.
- Internal choice: Students typically attempt any 6 to 7 activities out of 8 to 10. Choosing the right activities based on preparation is a strategy skill.
- Diagram and labelling required for cell structure, reproduction cycle, and digestive system topics.
- Both English Medium and Malayalam Medium papers available. Content is identical but language of questions and answers differs.
AP and Telangana State Board 8th Std Biology Question Paper
Students in Andhra Pradesh and Telangana follow AP SCERT and TS SCERT curricula respectively. Biology is part of the integrated Science paper for Class 8. The paper pattern and chapter content closely mirror the CBSE pattern since both use NCERT as a base, with state-specific additions.
| Feature | AP Board Class 8 Science | TS Board Class 8 Science |
| Biology chapters | NCERT-aligned with AP-specific examples | Same as AP with Telangana-specific environmental content |
| Paper total marks | 80 marks written + 20 internal | 80 marks written + 20 internal |
| Biology marks share | Approximately 25 to 30 of 80 marks | Approximately 25 to 30 of 80 marks |
| Paper source | Manabadi.com for previous year papers | TSBIE website and Manabadi.com |
| Medium | Telugu and English medium available | Telugu and English medium available |
Chapter-Wise Marks Weightage in 8th Std Biology
This is the most practically useful information for exam preparation and it is completely missing from every competing page on this topic. Based on question paper analysis across multiple years and boards, here is the typical marks distribution.
CBSE Class 8: Biology Marks Distribution in Annual Science Paper
| Biology Chapter | Expected Marks in Annual Paper |
| Cell: Structure and Functions | 5 to 6 marks (highest because diagram question almost always included) |
| Microorganisms: Friend and Foe | 4 to 5 marks (consistently high across years) |
| Reproduction in Animals | 4 to 5 marks (metamorphosis diagram commonly asked) |
| Crop Production and Management | 3 to 4 marks (1-mark and 2-mark questions dominate) |
| Conservation of Plants and Animals | 3 to 4 marks (definition and short answer format) |
| Reaching the Age of Adolescence | 3 to 4 marks (passage-based or case study questions common) |
| Total Biology Share in Science Paper | Approximately 25 to 30 out of 80 marks |
ICSE Class 8: Biology Chapter Marks Weightage
| Biology Chapter | Expected Marks in ICSE Paper |
| The Nervous System | 10 to 12 marks (neuron diagram + explanation required) |
| Reproduction in Plants and Animals | 10 to 12 marks (fertilisation diagrams, comparison questions) |
| The Excretory System | 8 to 10 marks (kidney diagram, urine formation steps) |
| Transport in Plants | 6 to 8 marks (osmosis, transpiration, xylem and phloem) |
| The Endocrine System | 6 to 8 marks (gland-hormone-function table questions) |
| Diseases and Health | 5 to 6 marks (communicable vs non-communicable, prevention) |
| Food and Nutrition | 4 to 5 marks (deficiency diseases, balanced diet) |
| Total | 80 marks standalone paper |
Model Questions Based on 8th Std Biology Question Paper Format
The following questions are built on the actual format used in CBSE and ICSE Class 8 biology question papers. These represent the question types, difficulty levels, and expected answer depth of real 8th std biology papers.
1-Mark Questions (CBSE Style)
| Q1. Name the process by which plants prepare their own food.
Answer: Photosynthesis
Q2. Name the female reproductive part of a flower. Answer: Pistil (or carpel)
Q3. Which hormone is responsible for changes during puberty in males? Answer: Testosterone
Q4. What is the full form of DNA? Answer: Deoxyribonucleic Acid
Q5. Name the book that records all endangered species. Answer: Red Data Book |
2-Mark Questions (CBSE Style)
| Q1. Differentiate between unicellular and multicellular organisms. Give one example of each. (2 marks)
Answer: Unicellular organisms consist of only one cell (eg: Amoeba). Multicellular organisms are made of many cells working together (eg: Human beings).
Q2. What is a biosphere reserve? Name any one biosphere reserve in India. (2 marks) Answer: A biosphere reserve is a protected area set up to conserve biodiversity and the lifestyle of local communities. Example: Nilgiri Biosphere Reserve.
Q3. List two ways in which microorganisms are useful to us. (2 marks) Answer: (i) Bacteria and yeast are used in making curd, cheese, and bread. (ii) Microorganisms are used to produce antibiotics like penicillin that treat infections. |
3-Mark Questions (CBSE / ICSE Style)
| Q1. Explain three differences between plant cells and animal cells. (3 marks)
Plant Cell vs Animal Cell: Has cell wall | No cell wall Has chloroplasts | No chloroplasts Has large central vacuole | Small or no vacuole
Q2. What is metamorphosis? Describe the stages in the life cycle of a frog. (3 marks) Answer: Metamorphosis is the process of transformation from an immature form to an adult form. Stages: Egg -> Tadpole (larva) -> Young frog (with tail) -> Adult frog
Q3. State three methods of asexual reproduction in plants with one example each. (3 marks) (i) Vegetative propagation: New plant from stem or root. Example: Potato from tuber. (ii) Budding: New organism from an outgrowth. Example: Yeast. (iii) Spore formation: Spores released that grow into new organisms. Example: Mucor (bread mould). |
5-Mark Questions with Diagram (ICSE Style)
| Q1. Draw a labelled diagram of an animal cell. Describe the function of any three organelles. (5 marks)
Diagram must include: Cell membrane, Nucleus, Mitochondria, Ribosomes, Endoplasmic Reticulum, Vacuole, Cytoplasm
Functions (any 3): Nucleus: Controls all cell activities and contains genetic information (DNA). Mitochondria: Produces energy through cellular respiration. Called the powerhouse of the cell. Cell Membrane: Controls what enters and leaves the cell. Maintains the cell shape.
Q2. Describe the structure of a neuron with a labelled diagram. Explain how a nerve impulse travels. (5 marks)
Diagram must include: Cell body (cyton), dendrites, axon, myelin sheath, axon terminals
Impulse path: Electrical signal at dendrites -> travels along axon -> passes to next neuron via synapse using neurotransmitters. |
Diagram-Based Questions in 8th Std Biology: A Strategy Competitors Ignore
Diagram questions are where students either collect easy marks or waste potential. Biology papers at 8th standard consistently include diagram questions worth 2 to 5 marks each. Here is what separates students who score well on diagrams from those who lose marks.
Most Frequently Asked Diagrams in 8th Std Biology Papers
- Animal cell diagram: Appears in CBSE mid-term and annual papers almost every year. Must include nucleus, cell membrane, mitochondria, vacuole, ribosomes, and endoplasmic reticulum.
- Plant cell diagram: Appears in both CBSE and ICSE papers. Must additionally include cell wall, chloroplasts, and large central vacuole.
- Structure of a neuron: Appears consistently in ICSE Class 8 Biology. Must include cyton, dendrites, axon, myelin sheath, and axon terminals.
- Flower parts diagram: Stamen, pistil, sepal, petal labels required. Appears in both CBSE and ICSE for plant reproduction topics.
- Life cycle of a frog: Egg, tadpole, young frog, adult frog stages. Appears in CBSE reproduction chapter questions.
- Kidney structure: Appears in ICSE Class 8 excretory system section. Cortex, medulla, pelvis, ureter, and nephron labels required.
How to Score Full Marks on Diagram Questions
- Draw with pencil first. Biology diagrams corrected on top of each other look messy and lose presentation marks.
- Label every part the question asks for. An unlabelled part earns zero marks for that label regardless of drawing accuracy.
- Use a ruler for arrows pointing to labels. Freehand arrows sometimes point to the wrong part by accident.
- Keep the diagram large enough to be clearly legible. Cramped diagrams with overlapping labels lose clarity marks.
- Never skip a diagram even if unsure. A correctly drawn diagram with two or three correct labels earns partial credit. A blank earns nothing.
Common Mistakes Students Make in 8th Std Biology Exams
These mistakes appear consistently across board evaluations. Knowing them before the exam costs you nothing. Making them costs you marks.
- Confusing plant cell and animal cell features. The three key differences: plant cells have a cell wall, chloroplasts, and large central vacuole. Animal cells have none of these. Students regularly mix these up under exam pressure.
- Writing incomplete definitions for 1-mark questions. ‘Microorganisms are very small’ earns zero marks. The expected answer includes: too small to see with the naked eye, require a microscope, can be bacteria, virus, fungus, or protozoa.
- Skipping labels in diagram answers. Some students draw a good cell diagram but leave half the labels blank, losing 2 to 3 marks on that single question.
- Using vague language like ‘it’ instead of the biological subject name. ‘It uses sunlight to make food’ scores lower than ‘The plant uses sunlight and carbon dioxide to prepare glucose through photosynthesis’.
- Not counting how many points are expected. A question asking for four uses answered with two earns at most half marks regardless of how well those two points are written.
- Under-preparing the adolescence chapter. Students avoid this chapter due to discomfort with the topic. It is among the most scoring chapters because the questions are predictable and answers are short.
- Attempting all activities in Kerala Board papers instead of the specified number. Most Kerala SCERT papers say ‘attempt any 6 out of 8’. Attempting all seven wastes time and only six will be evaluated.
How to Use 8th Std Biology Question Papers Effectively
There is a specific way to practice previous year papers that produces results, and most students do not use it. Reading through a question paper is not practice. Writing answers under time pressure is.
Six-Week Preparation Plan Using Previous Year Papers
- Week 1 and 2: Complete all biology chapters from your textbook. CBSE students complete six NCERT Science biology chapters. ICSE students complete ten biology chapters. Do not attempt any question paper during this phase.
- Week 3: Download one previous year or model paper for your board. Read all questions without attempting. Identify which chapters each question comes from. This builds your chapter-to-topic map.
- Week 4: Attempt one full paper under exam conditions. Set a timer. Write every answer by hand. Do not refer to notes. This is the most critical step.
- Week 5: Evaluate your attempt using the answer key. Mark each point you mentioned correctly and each point you missed. For diagram questions, check every label in the answer key is in your diagram.
- Week 6: Focus on the chapters and question types where you lost the most marks. Attempt two more model papers and repeat the evaluation process.
Also Read : 8th Class Biology Question Paper 2017 – All Boards, Chapters, Marks, PDF Download
Where to Download 8th Std Biology Question Papers for Free
All sources listed here are free. No payment required for basic access on most of them.
For CBSE Class 8 Biology Question Papers
- StudiesToday (studiestoday.com): Most comprehensive archive of CBSE Class 8 Science papers by year, set, and school. Includes mid-term and annual papers. Answer keys provided for most papers.
- LearnCBSE (learncbse.in): NCERT-based question papers for Class 8 Science with detailed solutions. Strong on chapter-wise important questions for each biology topic.
- CBSE Academic Portal (cbseacademic.nic.in): Official source for CBSE sample question papers. Best for understanding the official question pattern and marking scheme.
- Vedantu (vedantu.com): Free CBSE Class 8 Science sample papers with solutions. Papers align with NCERT content. Good for mid-term preparation.
- BYJU’S (byjus.com): CBSE Class 8 Science previous year and sample papers with chapter-wise biology practice papers.
For ICSE Class 8 Biology Question Papers
- SelfStudys (selfstudys.com): Large collection of ICSE Class 8 Biology sample papers organised by paper number. Solutions available for most papers.
- Extramarks (extramarks.com): ICSE Class 8 Biology sample papers with chapter-wise question sets. Useful for targeted practice.
- Scribd (scribd.com): Community-uploaded ICSE Class 8 Biology papers from individual schools. Useful for finding school-specific papers.
- Your school’s past papers: The single most reliable source for ICSE students. Each ICSE school sets its own paper. Your school’s previous papers most accurately predict your upcoming exam.
For Kerala Board Class 8 Biology (Basic Science) Papers
- Education Observer (educationobserver.com): Most complete archive of Kerala SCERT Class 8 Basic Science papers. Onam, Christmas, and Annual papers in both English and Malayalam medium.
- Exam Winner (examwinner.com): Kerala Class 8 Basic Science papers with answer keys. Well-organised by exam type.
- AglaSem Schools (schools.aglasem.com): Class 8 First Term and Second Term biology question papers for Kerala Board with download links.
For AP and TS State Board Class 8 Biology Papers
- Manabadi (manabadi.co.in): Comprehensive archive of AP and TS state board previous year question papers including Class 8 Science biology portions.
- BSE Telangana (bse.telangana.gov.in): Official source for TS board model papers and previous year papers.
Frequently Asked Questions About 8th Std Biology Question Papers
Q1. Is biology a separate subject in Class 8 or part of Science?
It depends on your board. Under CBSE, biology chapters are part of the integrated Science paper alongside Physics and Chemistry. Under ICSE, Biology is a completely separate subject with its own 80-mark question paper. Under Kerala Board, it is part of the Basic Science paper. Under AP and TS boards, it is part of the combined Science paper.
Q2. How many marks does the biology portion carry in the CBSE Class 8 Science paper?
In the CBSE Class 8 Science annual exam, the biology portion typically accounts for 25 to 30 marks of the total 80 marks. This comes from six biology chapters in the NCERT Science textbook. The exact distribution varies since each school sets its own paper, but this range is consistent across most CBSE-affiliated schools.
Q3. Which biology chapter carries the most marks in 8th std?
For CBSE students, Cell Structure and Functions consistently carries the highest marks (5 to 6 marks) because it includes a diagram question. For ICSE students, the Nervous System chapter is the highest-weightage chapter, typically carrying 10 to 12 marks. For Kerala Board, the Cell chapter and Ecosystem chapter tend to carry the most marks in Basic Science.
Q4. What diagrams should I prepare for the 8th std biology exam?
For CBSE: Animal cell, plant cell, life cycle of a frog, stages of metamorphosis, and parts of a flower. For ICSE: Neuron structure, kidney cross-section, male and female reproductive systems, and plant vs animal cell comparison. For Kerala Board: Cell structure, food web diagram, and digestive system. Practice drawing and labelling each from memory at least three times before the exam.
Q5. Are Class 8 biology question papers the same across all CBSE schools?
No. CBSE does not issue a common question paper for Class 8. Each school sets its own paper based on CBSE curriculum guidelines. Papers differ between schools even in the same city. However, the chapter content, question types, and marks distribution follow a consistent pattern. Practicing papers from multiple schools gives broader coverage.
Q6. What is the difference between CBSE and ICSE biology at 8th standard?
ICSE Class 8 Biology is significantly more detailed. CBSE covers six biology chapters within a combined Science paper. ICSE covers ten or more biology chapters in a dedicated 80-mark paper. ICSE includes the nervous system, endocrine system, and excretory system in Class 8, which CBSE covers only in Class 10. ICSE requires longer written answers and more diagram work. The difficulty level in ICSE Class 8 Biology is comparable to CBSE Class 10 Science.
Q7. Where can I find the answer key for the 8th std biology question paper?
For CBSE, answer keys are available on StudiesToday, LearnCBSE, and BYJU’S for their sample papers. For ICSE, SelfStudys and Extramarks provide answer keys. For Kerala Board, Education Observer and Exam Winner publish answer keys for Onam and Christmas exam papers. For AP and TS boards, Manabadi.com has marking scheme information.
Q8. How should I prepare the cell chapter for the 8th std biology exam?
Three things are required: a memorised labelled diagram of both animal and plant cells, a clear list of at least five differences between plant and animal cells, and the function of each major organelle in two sentences. Practice drawing the cell diagram from memory until you can produce it in under three minutes. This chapter reliably contributes 5 to 6 marks in CBSE papers and 8 to 10 marks in ICSE papers.
Q9. What is the passing mark for 8th std biology?
For CBSE, passing requires 33% of total Science paper marks. For an 80-mark paper, that is 27 marks from the written exam. For ICSE standalone Biology, passing requires 33% of 80 marks, approximately 27 marks. Kerala Board requires 33% per subject. Most schools also require a minimum grade in internal assessment independently.
Q10. Is the NCERT Class 8 Science textbook enough for biology preparation?
For CBSE students, yes. All CBSE Class 8 Science questions are framed from NCERT. Understanding every chapter including in-text questions and end-of-chapter exercises fully prepares you for the biology portion. For ICSE students, no. ICSE uses separate biology textbooks (Ratna Sagar or Selina) with significantly more content than NCERT. Studying only NCERT is insufficient for ICSE Class 8 Biology.
