What is ICSE Class 10 Biology?
ICSE Class 10 Biology is the Biology part of the ICSE Science course. It covers cells and heredity, plant physiology, human body systems, reproduction, population and pollution, and it expects students to explain processes, draw labelled diagrams and write answers in a step-by-step manner.
ICSE Class 10 Biology — Books (Free PDF Download)
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This page is a text-only replacement for the thin book page. It gives a syllabus-based chapter map, a safe way to use Biology solutions, worked examples and answer-writing guidance. Students searching for ICSE Class 10 Biology Book – Chapters & Solutions 2026 should treat this as an evergreen study guide, not as an exam date sheet.
Concept snapshot: think of Biology as process chains
A Class 10 Biology answer becomes easier when you do not memorise loose facts. Treat every chapter as a chain: structure → function → process → result. For example, in the kidney chapter, the nephron is the structure, filtration and reabsorption are the processes, and urine formation is the result. The same chain works for stomata, heart chambers, neurons, endocrine glands and reproductive organs.
Which ICSE Class 10 Biology book should students use?
Use the Biology textbook prescribed by your ICSE school and keep the latest CISCE syllabus beside it. Many ICSE schools use Concise Biology Class 10 by Selina Publishers, while some schools use Frank, Evergreen or another school-approved text. The safer rule is simple: your book may arrange chapters differently, but your answers must match the CISCE syllabus language and the diagrams taught in class.
CISCE publishes the official Regulations, Syllabuses and Specimen Question Papers. Use that official source for syllabus scope and paper style. Use the textbook for definitions, labelled diagrams, exercise practice and school tests.
| Resource | Use it for | How to avoid mistakes |
|---|---|---|
| School-prescribed Biology book | Definitions, diagrams, chapter exercises and examples | Do not mix two textbooks for definitions unless your teacher has accepted both wordings. |
| CISCE syllabus and specimen paper | Official scope, paper style and internal assessment expectations | Do not rely on unofficial chapter-wise weightage tables as fixed marks. |
| Class notes and lab record | Practical observations, diagrams and teacher-approved answer points | Keep diagrams consistent with the labels used in class. |
| Solutions pages | Checking exercise answers after attempting them | Read the solution only after writing your own answer first. |
For wider planning, use the ICSE Class 10 syllabus. For exam-style practice after finishing chapters, use ICSE Class 10 question papers. For quick revision, keep ICSE Class 10 Biology notes beside your textbook.
ICSE Class 10 Biology book: chapters and syllabus areas
The exact chapter numbering can vary by textbook and edition. Instead of treating one table as the only official chapter list, map your book to the syllabus areas below. This prevents a common error: skipping a topic because its chapter number is different in another publisher’s book.
| Syllabus area | Typical book chapters or lesson titles | What you must be able to do |
|---|---|---|
| Basic Biology | Cell cycle, chromosomes, cell division and genetics | Define key terms, distinguish mitosis and meiosis, solve simple inheritance crosses and explain Mendel’s laws with correct symbols. |
| Plant Physiology | Absorption by roots, transpiration and photosynthesis | Explain osmosis, diffusion, transpiration pull, stomatal movement, photosynthesis equation and factors affecting the rate of photosynthesis. |
| Human Anatomy and Physiology | Circulatory, excretory, nervous, endocrine and reproductive systems | Draw labelled diagrams, trace pathways, name hormones and functions, and write process answers in correct sequence. |
| Population and Health | Population growth, health organisations or aids to health where included by your edition | Explain causes, effects and control measures using points that are specific, not general slogans. |
| Environment | Pollution and environmental management | Write causes, effects and preventive measures for air, water, soil and noise pollution with examples. |
Syllabus-specific insight: Class 10 Biology is not tested only as memory work. The recurring demand is explanation with sequence: for example, water entry into roots, passage of blood through the heart, urine formation in the nephron, reflex action through neurons, and hormone action through target organs.
Book-to-syllabus checklist
- Mark every definition that has a precise syllabus meaning: osmosis, diffusion, transpiration, photosynthesis, reflex action, hormone, endocrine gland and fertilisation.
- Keep a separate diagram list for heart, nephron, neuron, reflex arc, stomata and reproductive structures taught in your school edition.
- For genetics, make a symbol box before solving crosses. Example: T = tall allele, t = dwarf allele.
- For endocrine system, prepare one table: gland, hormone, function and disorder caused by under-secretion or over-secretion where taught.
How to use Biology solutions without weakening recall
Biology solutions help only when they are used as a checking tool. If you read the solved answer first, you may recognise it but fail to reproduce it in a test. The better method is: attempt, compare, correct, then rewrite from memory.
- Attempt the answer first. Write the definition, diagram or process in your own notebook without looking at the solution.
- Compare the key terms. Check whether your answer contains the required scientific words such as semipermeable membrane, target organ, genotype, phenotype, ultrafiltration or selective reabsorption.
- Correct the sequence. In process answers, order matters. A correct point in the wrong place can confuse the explanation.
- Rewrite once. Close the book and write the answer again in shorter board-paper form.
Practical application: Use solutions after completing one exercise set, not after every question. This trains recall and also shows which chapter needs another reading.
Worked examples from ICSE Class 10 Biology
Worked example 1: Monohybrid cross in genetics
Question: In pea plants, tallness is dominant over dwarfness. A heterozygous tall plant is crossed with another heterozygous tall plant. Find the genotypic and phenotypic ratios.
Step 1: Choose symbols. Let T represent the dominant allele for tallness and t represent the recessive allele for dwarfness.
Step 2: Write parent genotypes. Heterozygous tall means one dominant and one recessive allele, so the cross is Tt \times Tt.
Step 3: Write gametes. Each parent can produce two types of gametes: T and t.
| Gametes | T | t |
|---|---|---|
| T | TT | Tt |
| t | Tt | tt |
Step 4: Read the genotypes. The offspring are TT, Tt, Tt and tt. Therefore, the genotypic ratio is 1TT : 2Tt : 1tt.
Step 5: Read the phenotypes. TT and Tt are tall because T is dominant. Only tt is dwarf. Therefore, the phenotypic ratio is 3 tall : 1 dwarf.
Final answer: Genotypic ratio = 1 : 2 : 1; phenotypic ratio = 3 : 1.
Worked example 2: Rate of transpiration from mass loss
Question: A covered potted plant arrangement weighs 250 g at 9 a.m. and 242 g at 11 a.m. Assuming the loss is due to transpiration, calculate the average rate of water loss.
Step 1: Find the mass lost. Initial mass = 250 g. Final mass = 242 g.
Mass lost = 250 - 242 = 8 g.
Step 2: Find the time interval. From 9 a.m. to 11 a.m. = 2 hours.
Step 3: Use the rate formula. Rate of water loss = \frac{\text{mass lost}}{\text{time}}.
Rate = \frac{8\text{ g}}{2\text{ h}} = 4\text{ g h}^{-1}.
Final answer: The average rate of water loss is 4 g per hour. In an experiment answer, also mention that the soil and pot must be covered so that water loss from soil evaporation is reduced.
Worked example 3: Photosynthesis experiment conclusion
Question: A destarched green leaf is partly covered with black paper and kept in sunlight. After testing with iodine, only the uncovered part turns blue-black. What does this show?
Step 1: Identify the condition changed. The covered part did not receive light. The uncovered part received light.
Step 2: Identify the test used. Iodine solution tests for starch. A blue-black colour indicates starch is present.
Step 3: Compare both parts. The uncovered part turns blue-black, so starch was formed there. The covered part does not turn blue-black, so starch was not formed there.
Step 4: State the conclusion. Starch formation in a green leaf occurs only where light is available.
Final answer: The experiment shows that light is necessary for photosynthesis.
Worked example 4: Endocrine system diagnosis
Question: A student writes: “A person has high blood sugar because the pancreas secretes too much insulin.” Correct the statement.
Step 1: Recall insulin function. Insulin lowers blood glucose by helping body cells use or store glucose.
Step 2: Connect hormone deficiency to symptom. If insulin is deficient, blood glucose remains high.
Step 3: Name the condition. Persistent high blood glucose due to insufficient insulin is associated with diabetes mellitus.
Final answer: The corrected statement is: “A person may have high blood sugar when the pancreas secretes too little insulin, leading to diabetes mellitus.”
Exam relevance and answer-writing method
In the standard ICSE Science Paper 3 (Biology) structure used in CISCE syllabus and specimen-paper formats, the theory paper is for 80 marks and the internal assessment or practical work is for 20 marks. The theory paper normally tests definitions, diagram skills, reasoning and application through a compulsory section and a choice-based section. Always read the instructions printed on the paper for the year in which you appear.
| Component | Standard marks | What it checks |
|---|---|---|
| Theory paper | 80 | Definitions, short answers, diagrams, reasoning, genetics working and process explanations |
| Internal assessment / practical work | 20 | School-based practical work, lab record and related assessment as directed by the school |
Examiner’s mindset: where answers gain or lose credit
Biology answers are often checked in parts. In genetics, credit depends on correct symbols, parent genotypes, gametes, Punnett square and final ratio. In diagrams, a clean outline is not enough; labels must be placed on the correct part. In process answers, marks are lost when a student writes the right terms in a broken sequence, such as writing “urine formation” before explaining ultrafiltration and selective reabsorption.
| Question type | What to write first | What to check before moving on |
|---|---|---|
| Definition | The exact scientific meaning | Does it include the key condition or process? |
| Diagram | Neat labelled drawing in pencil if required by school practice | Are labels horizontal, readable and attached to correct parts? |
| Process explanation | Step 1 of the process | Is the sequence logical from cause to result? |
| Genetics cross | Symbols and parental genotypes | Are genotype and phenotype ratios both stated? |
| Hormone table | Name of gland and hormone | Is the function linked to the correct target effect? |
Common mistakes students make in Biology
Common mistakes and corrections
- Mistake: Writing “hormones are enzymes.” Correction: Hormones are chemical messengers secreted by endocrine glands and carried in blood to target organs. Enzymes are biological catalysts and are not the same as hormones.
- Mistake: Giving only the final genetics ratio. Correction: Show symbols, parent genotypes, gametes, Punnett square and then the ratio.
- Mistake: Mixing osmosis and diffusion. Correction: Osmosis is movement of water through a semipermeable membrane; diffusion is movement of particles from higher to lower concentration.
- Mistake: Labelling diagrams with arrows crossing each other. Correction: Keep labels clear and connected to the exact part. A wrong label can spoil an otherwise correct diagram.
- Mistake: Writing pollution answers as general complaints. Correction: Use a fixed pattern: cause, pollutant, effect and control measure.
Edge case: Some textbook editions split a topic into two chapters or merge two smaller topics into one chapter. Do not panic if your chapter number differs from another student’s book. Check whether the syllabus point is present, not whether the numbering matches.
How to study Biology from the book each week
A simple weekly cycle works better than reading the whole book again and again. Use one notebook for definitions, one for diagrams and one section for mistakes found while checking solutions.
- Day 1: Read the chapter and underline definitions only after understanding the paragraph.
- Day 2: Draw diagrams from memory and compare labels with the textbook.
- Day 3: Solve exercise questions without looking at solutions.
- Day 4: Check solutions and rewrite wrong answers in board-answer form.
- Day 5: Practise one mixed set from previous question papers.
- Day 6: Revise weak definitions and one diagram.
- Day 7: Restudy only the errors, not the whole chapter.
For quick revision, group chapters by skill. Genetics needs written working. Plant physiology needs process diagrams and experiments. Human physiology needs labelled structures and sequence. Pollution needs organised points with examples.
Frequently Asked Questions
Which book should I use for ICSE Class 10 Biology?
Use the Biology book prescribed by your ICSE school. Selina Concise Biology is common in many schools, but the important rule is to match your book with the CISCE syllabus and your teacher’s class notes.
Does ICSE Class 10 Biology have fixed chapter-wise marks?
Do not assume fixed chapter-wise marks unless CISCE or your school has issued a formal scheme for that paper. Prepare every syllabus area, and give extra practice to diagrams, genetics crosses, plant physiology experiments and human physiology processes.
How should I use ICSE Biology solutions while studying?
Write your own answer first, then compare it with the Biology solution. Correct missing keywords, sequence errors and diagram labels. Finally, rewrite the answer once without looking at the solution.
Are diagrams important in the ICSE Class 10 Biology paper?
Yes. Diagrams are important because Biology questions often test structure and function together. Practise neat labelled diagrams for systems and processes taught in your book, especially where labels explain the answer.
How do I write a genetics cross answer in Biology?
Start with allele symbols, write parent genotypes, list gametes, draw the Punnett square, and then state both genotypic and phenotypic ratios. Do not write only the final ratio.
Downloads & PDF Resources
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