ICSE Class 10 Biology Question Paper 2025 with Solutions
ICSE
Biology2025Download the official ICSE Class 10 Biology Question Paper 2025 with step-by-step solutions prepared by subject matter experts. Solving previous years' ICSE Class X board papers helps students understand question formats, marking distributions, and high-frequency topics to score top marks in board examinations. Access the free PDF download above with complete answer keys.
About this paper
This is the ICSE Class 10 Biology (Science Paper 3) question paper from the 2025 examination, paper code T25 523. It carries 80 marks, with two hours of writing time plus 15 minutes of reading time. Section A (40 marks) is compulsory: Question 1 has 15 one-mark multiple-choice questions, several of them assertion–reason, and Question 2 has five parts covering naming, a passage on the heart to complete, logical sequences and matching endocrine glands with their functions. In Section B candidates attempt any four of Questions 3–8, worth 10 marks each, with many real-life cases such as seedless grapes, a gymnast losing her balance, a cataract and a dihybrid cross in tomatoes. Someone has ticked options on several multiple-choice questions in this copy; no worked answers are given.
- Exam
- ICSE Class 10
- Subject
- Biology
- Year
- 2025
- Paper code
- T25 523
- Maximum marks
- 80
- Time allowed
- 2 hours + 15 min reading
- Questions
- 8
- Pages
- 16
- Answers included
- No, questions only
Paper pattern
Section A – Question 1
15 marks15 multiple-choice questions, one mark each, several of them assertion–reason
Section A – Question 2
25 marksFive five-mark parts: naming, fill in the blanks, logical sequences, naming structures and matching endocrine glands
Section B
40 marksQuestions 3–8, attempt any four; each 10 marks, split into five parts of one to three marks
Topics covered
- Cell division
- Genetics and DNA
- Evolution
- Photosynthesis
- Plant hormones and transpiration
- Circulatory system and blood
- Excretory system
- Nervous system
- Sense organs: eye and ear
- Endocrine system
- Human reproduction
- Pollution and population
Questions from this paper
- A scientist cut the tails of all the mice in an experiment and made them reproduce. What will be the phenotype of the offspring?
- Mention the two pairs of nitrogenous bases present in a DNA strand that pair with each other by hydrogen bonds.
- Ahmed had a severe throat infection, and after a few days he developed an earache too. What could be the reason for the pain in his ears? Explain.
- What are vestigial organs? Give one example of a vestigial structure in the human mouth.
- State the difference between a nephron and a neuron.
- Give any two characteristic features of Cro-Magnon man.
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