Exploration: Grade 9 Science Textbook Notes

Curriculum Policy and Vision for Secondary Science

  • National Education Policy (NEP) 2020 Framework:

    • Envisions an education system grounded in India's cultural, intellectual, and ethical traditions.
    • Equips learners with skills to engage with complex global challenges while remaining rooted in local wisdom.
    • Emphasizes holistic development, inquiry-driven learning, and the integration of ethics and values across subjects.

  • National Curriculum Framework for School Education (NCF-SE) 2023 Guidelines:

    • Establishes a continuous curricular pathway across foundational, preparatory, middle, and secondary stages of schooling.
    • Promotes critical thinking, creativity, empirical reasoning, and social sensitivity for responsible citizenship.
    • Defines the secondary stage (Grades 9 to 12) as a crucial adolescent phase for developing self-reflection, logical argumentation, and systematic inquiry.
    • Mandates a 10-subject broad curriculum for Grades 9–10, encompassing three languages (including at least two native Indian languages), Science, Mathematics, Social Science, Art Education, Physical Education and Well-being, Individuals in Society or Environmental Education, and Vocational Education.

  • Core Aims of Secondary Science Education:

    • Fosters scientific temper, objectivity, open-mindedness, and respect for evidence.
    • Connects conceptual knowledge to everyday experiences and real-world phenomena.
    • Presents science as an evolving, collaborative human endeavor rather than a static collection of facts.
    • Integrates physics, chemistry, biology, and earth science with cross-cutting themes like environmental awareness, technological impact, and ethical responsibility.

Overview and Objectives of Exploration (Grade 9 Science)

  • Conceptual Foundation:

    • Serves as a continuation of the middle-stage science learning built through the Curiosity series in Grades 6–8.
    • Defines "exploration" as the process of investigating the unknown through systematic observation, question formulation, hypothesis testing, and experimentation.
    • Transitions students from simple observation to formal scientific inquiry, abstract thinking, and quantitative reasoning.

  • Scope of Content:

    • World of Matter: Covers atomic structure, chemical behavior, elements, compounds, mixtures, and separation techniques.
    • Physical World and Governing Laws: Focuses on motion, forces, Newton's laws, work, energy, simple machines, and acoustics (sound waves).
    • Living World: Examines cellular organization, specialized tissues, mechanisms of reproduction, and biological classification/diversity.
    • Earth Systems: Analyzes the interconnected flows of energy, matter, and life across Earth's spheres (atmosphere, hydrosphere, biosphere, geosphere).

  • Interdisciplinary Connections:

    • Links science concepts with mathematical modeling, technological applications, historical developments, art, and social studies.
    • Emphasizes the relationship between scientific discoveries and societal progress.

Textbook Layout, Pedagogy, and Interactive Features

  • Activity-Based Experiential Learning:

    • Prioritizes hands-on activities, teamwork, and inclusive participation over rote memorization.
    • Integrates explicitly marked Safety First warnings for handling heat sources, corrosive materials, sharp tools, glass containers, and optical devices like microscopes.

  • Inbuilt Pedagogical Elements and Box Features:

    • Think It Over: Introductory, open-ended questions (why, what, how) designed to spark reflection and curiosity at the start of topics.
    • Notes: Embedded clarifications, supplementary context, and extra details that support comprehension without breaking narrative flow.
    • Cross-Referencing Icons: Connects current topics to prior learning from middle school (e.g., Grade 8 Curiosity Chapter X) and provides previews for advanced concepts (Next Level Up). Inter-subject textbook links are available at https://ncert.nic.in/textbook.php.
    • Pause and Ponder / Section Assessment: Subsection questions and solved numerical problems that enable self-evaluation and conceptual testing.
    • Threads of Curiosity: Detailed boxes covering advanced concepts, real-world practical applications, and deep scientific explorations beyond the core curriculum.
    • Bridging Science and Society / India's Scientific Contributions: Examines how scientific developments address real-world challenges in healthcare, environment, technology, and agriculture, highlighting ancient and contemporary contributions from India.
    • Think as a Scientist: Encourages learners to modify experimental protocols, design physical or conceptual models, test variables, and formulate original research questions.
    • What if…: Presents hypothetical, open-ended scenarios and ethical dilemmas to build creative problem-solving skills and social responsibility.
    • The Quest Continues…: Highlights current boundaries of science, showcasing ongoing research questions that scientists are actively attempting to solve.
    • Meet a Scientist: Highlights biographical profiles and discoveries of Indian and international scientists to humanize scientific discovery.
    • At a Glance: Summary sections at the end of chapters that consolidate major concepts and takeaways.
    • Keywords: Essential scientific terms highlighted throughout the text to strengthen scientific literacy and procedural vocabulary.
    • Revise, Reflect, Refine: End-of-chapter exercises featuring diverse item formats to assess core competencies, critical analysis, and problem-solving abilities.
    • The Journey Beyond: Out-of-classroom projects and collaborative tasks designed to engage peers, family, experts, and the broader community.
    • Ready for New Horizons?: An epilogue reviewing key Grade 9 concepts and previewing the Grade 10 science curriculum.
    • Page Margin Symbols: Page numbers are framed by a magnifying glass (representing detailed observation) and a compass (representing direction and navigation in inquiry).

Guidelines for Safe Internet Exploration

  • Digital Safety Protocols for Students:
    • Use strong, unique passwords that contain a combination of letters, numbers, and special symbols.
    • Keep passwords completely confidential; never share them with friends or external entities.
    • Avoid clicking on unverified links, unexpected pop-up advertisements, or unknown website banners.
    • Refrain from downloading applications, software, or files from untrusted internet sources.
    • Protect personal privacy by never disclosing phone numbers, home addresses, school details, or personal images online.
    • Always log out of email addresses, learning platforms, and online accounts after completing a session.
    • Immediately report suspicious online interactions, unsafe content, or uncomfortable experiences to a teacher, parent, or trusted adult.

Table of Contents and Course Structure

  • Chapter 1: Exploration: Entering the World of Secondary Science (Page 1)
  • Chapter 2: Cell: The Building Block of Life (Page 8)
  • Chapter 3: Tissues in Action (Page 28)
  • Chapter 4: Describing Motion Around Us (Page 48)
  • Chapter 5: Exploring Mixtures and their Separation (Page 72)
  • Chapter 6: How Forces Affect Motion (Page 94)
  • Chapter 7: Work, Energy, and Simple Machines (Page 116)
  • Chapter 8: Journey Inside the Atom (Page 140)
  • Chapter 9: Atomic Foundations of Matter (Page 162)
  • Chapter 10: Sound Waves: Characteristics and Applications (Page 184)
  • Chapter 11: Reproduction: How Life Continues (Page 208)
  • Chapter 12: Patterns in Life: Diversity and Classification (Page 228)
  • Chapter 13: Earth as a System: Energy, Matter, and Life (Page 252)
  • Answer Key (Page 271)

Publication Details and Organizational Offices

  • Bibliographic and Production Data:

    • Title: Exploration — Textbook of Science for Grade 9
    • First Edition: April 2026 Chaitra 1948
    • Publication Code: PD 500T BS
    • Copyright: © National Council of Educational Research and Training (NCERT), 2026
    • Paper Specifications: Printed on 80 GSM paper carrying the official NCERT watermark
    • Retail Price: ₹ 205.00
    • ISBN: 978-93-5729-567-3
    • Textbook Code Number: 0906
    • Published by: The Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi 110 016
    • Director, NCERT: Dinesh Prasad Saklani (February 2026)

  • Publication Team Members:

    • Head, Publication Division: M.V. Srinivasan
    • Chief Editor: Bijnan Sutar
    • Chief Business Manager: Amitabh Kumar
    • Chief Production Officer (In charge): Deepak Jaiswal
    • Production Assistant: Ashwani Machra
    • Cover, Layout, and Illustrations: Fajruddin, Junaid Digital Arts

  • Offices of the Publication Division, NCERT:

    • New Delhi: NCERT Campus, Sri Aurobindo Marg, New Delhi 110 016 | Phone: 011-26562708
    • Bengaluru: 108, 100 Feet Road, Hosdakere Halli Extension, Banashankari III Stage, Bengaluru 560 085 | Phone: 080-26725740
    • Ahmedabad: Navjivan Trust Building, P.O. Navjivan, Ahmedabad 380 014 | Phone: 079-27541446
    • Kolkata: CWC Campus, Opp. Dhankal Bus Stop, Panihati, Kolkata 700 114 | Phone: 033-25530454
    • Guwahati: CWC Complex, Maligaon, Guwahati 781 021 | Phone: 0361-2674869

National Syllabus and Teaching Learning Material Committee (NSTC) and Development Teams

  • National Syllabus and Teaching Learning Material Committee (NSTC) Members:

    1. M. C. Pant, Chancellor, National Institute of Educational Planning and Administration (NIEPA) — (Chairperson)
    2. Manjul Bhargava, Professor, Princeton University — (Co-Chairperson)
    3. Sudha Murty, Acclaimed Writer and Educationist
    4. Shekhar Mande, Former Director General, CSIR; Distinguished Professor, Savitribai Phule Pune University, Pune
    5. Sujatha Ramdorai, Professor, University of British Columbia, Canada
    6. Shankar Mahadevan, Music Maestro, Mumbai
    7. U. Vimal Kumar, Director, Prakash Padukone Badminton Academy, Bengaluru
    8. Surina Rajan, IAS (Retd.), Haryana; Former Director General, HIPA
    9. Chamu Krishna Shastri, Chairperson, Bharatiya Bhasha Samiti, Ministry of Education
    10. Sanjeev Sanyal, Member, Economic Advisory Council to the Prime Minister (EAC–PM)
    11. Gajanan Londhe, Head, Programme Office, NSTC
    12. Rabin Chhetri, Director, SCERT, Sikkim
    13. Pratyusa Kumar Mandal, Professor in History and Dean Instruction, RIE, Mysuru
    14. Dinesh Kumar, Professor in Zoology and Dean Research, NCERT, New Delhi
    15. Kirti Kapur, Former Professor, Department of Education in Languages, NCERT, New Delhi
    16. Ranjana Arora, Professor and Head, Department of Curriculum Studies and Development, NCERT, New Delhi — (Member-Secretary)

  • Curricular Area Group (CAG): Science Leadership:

    • Chairperson, CAG Science: Shekhar C. Mande, FNA, FASc, FNASc, Former Director General, CSIR; Distinguished Professor, Bioinformatics Centre, Savitribai Phule Pune University; Honorary Distinguished Scientist, National Centre for Cell Science, Pune
    • Physics Sub-group Leader & Overall Team Leader: Arnab Bhattacharya, Centre Director, Homi Bhabha Centre for Science Education (HBCSE), TIFR, Mumbai; Senior Professor, Department of Condensed Matter Physics and Material Science, TIFR, Mumbai
    • Earth Science Sub-group Leader: R. Shankar, Adviser, International Geoscience Education Organisation; Coordinator, International Earth Science Olympiad; Former Professor, Mangalore University, Mangaluru
    • Biology Sub-group Leader: Saroj Ghaskadbi, Former Senior Professor, Savitribai Phule Pune University, Pune
    • Chemistry Sub-group Leader: Uday Maitra, Honorary Professor and INSA Senior Scientist, Indian Institute of Science, Bengaluru
    • Member Convenor (CAG Science) & Chemistry Coordinator: Anjni Koul, Professor, DESM, NCERT, New Delhi
    • Physics Coordinator: Rachna Garg, Professor, DESM, NCERT, New Delhi
    • Earth Science Coordinator: R. R. Koireng, Professor, DCSD, NCERT, New Delhi
    • Biology Coordinator: Sunita Farkya, Professor and Head, DESM, NCERT, New Delhi

  • Textbook Development Team Contributors:

    • Abhay Kumar (Associate Professor, CIET, NCERT, New Delhi)
    • Adithi Muralidhar (Scientific Officer, HBCSE, TIFR, Mumbai)
    • Amit Bhattacharya (Associate Professor, Ramjas College, University of Delhi, Delhi)
    • Anand Arya (Associate Professor, RIE, NCERT, Ajmer)
    • Animesh Kumar Mohapatra (Former Professor, DESM, RIE, NCERT, Bhubaneswar)
    • Apala Chakraborty (Principal, The Future Scholars Academy CBSE School, Kolkata, West Bengal)
    • Arun Pratap Sikarwar (Associate Professor, DESM, NCERT, New Delhi)
    • Ashish Kumar Srivastava (Assistant Professor, DESM, NCERT, New Delhi)
    • C. V. Shimray (Professor, DESM, NCERT, New Delhi)
    • Charu Maini (Principal, DAV Public School, Sector 49, Gurugram, Haryana)
    • Divya Haridas (Professor, Department of Physics, Keshav Mahavidyalaya, University of Delhi, Delhi)
    • Fanindra Sharma (Educator and Consultant, Chanakya University, Bengaluru)
    • Gauri Roy (PGT Physics, Demonstration Multipurpose School, RIE, NCERT, Mysuru)
    • Hrishikesh Baruah (Principal, K.C. Das Commerce College, Guwahati)
    • Indrani Das Sen (Scientific Officer, HBCSE, TIFR, Mumbai)
    • Jaya P. Swaminathan (Teacher Developer, Royal Society of Chemistry, Bengaluru)
    • Karthick Balasubramanian (Scientist E, Agharkar Research Institute, Pune)
    • Linto Alappat (Assistant Professor, Christ College Autonomous, Irinjalakuda, Thrissur, Kerala)
    • Mayuri Rege (Reader, HBCSE, TIFR, Mumbai)
    • Mridula Arora (Principal, Navyug School, Sarojini Nagar, New Delhi)
    • Munindra Ruwali (Associate Professor, DESM, NCERT, New Delhi)
    • Neeraja Dashaputre (Principal Technical Officer Education, IISER, Pune)
    • P. V. Raghavendra (Associate Professor, DESM, NCERT, New Delhi)
    • Pankaj Jain (Director, Academic and Operations, Seed2Sapling Education Foundation, Bengaluru)
    • Pooja Gokhale Sinha (Assistant Professor, Sri Venkateswara College, University of Delhi, New Delhi)
    • Poonam Katyal (Former TGT, Zeenat Mahal Sarvodaya Kanya Vidyalaya, Jafrabad, Delhi)
    • Praveen Pathak (Scientific Officer, HBCSE, TIFR, Mumbai)
    • Puja Goyal (PGT Chemistry, Government Model Senior Secondary School, Chandigarh)
    • Pushpa Tyagi (Former Head of Department Physics, Sanskriti School, Chanakyapuri, New Delhi)
    • Pushp Lata Verma (Professor, DESM, NCERT, New Delhi)
    • Ravijot Sandhu (PGT Chemistry, Navyug School, Laxmibai Nagar, New Delhi)
    • Ravindra Kumar Parashar (Professor, DESM, NCERT, New Delhi)
    • Ruchi Verma (Professor, DESM, NCERT, New Delhi)
    • Sarita Kumar (Professor, Acharya Narendra Dev College, University of Delhi, Delhi)
    • Sarita Vig (Professor, Indian Institute of Space Science and Technology - IIST, Thiruvananthapuram)
    • Sekar Venkatraman (Head of Department, Isha Home School, Coimbatore)
    • Shashibhal Pandey (Associate Professor, CHM College, Ullasnagar)
    • Shirish Pathare (Scientific Officer, HBCSE, TIFR, Mumbai)
    • Smita Chaturvedi (Assistant Professor, Interdisciplinary School of Science, Savitribai Phule Pune University, Pune)
    • Sudesh Kumar (Associate Professor, DESM, NCERT, New Delhi)
    • Surhud More (Professor, Inter-University Centre for Astronomy and Astrophysics - IUCAA, Pune)
    • T. A. Viswanath (Former Associate Professor, Goa University, Goa)
    • Tarun Choubisa (Chief Consultant, Programme Office, NSTC)
    • Ved P. Arya (Assistant Professor, RIE, NCERT, Ajmer)
    • Vijay Singh (Former Professor, HBCSE, TIFR, Mumbai)

  • Reviewers:

    • Manjul Bhargava, Anurag Behar, Gajanan Londhe, Ankush Gupta, B. K. Sharma, Charu Dogra, Dinesh Kumar, Ginni Singh, K. K. Arora, K. V. Sridevi, Lakshmy Ravishankar, Monika Koul, Mrinal Shah, M. S. Sriram, P. C. Agarwal, Preeti Khanna, Saket Bahuguna, Sanjay P. Sane, Sanjiv Kumar, Santosh Gharpure, Sarthak Parikh, Satyajit Rath, Savita Ladage, Shubha Tole, Sujata Bhargava, Surendra Ghaskadbi, Vijay Sarda, V. B. Bhatia, Viswajanani J. Sattigeri, Yukti Sharma.

Fundamental Rights and Preamble of the Constitution of India

  • Preamble to the Constitution of India:

    • Text: "WE, THE PEOPLE OF INDIA, having solemnly resolved to constitute India into a SOVEREIGN SOCIALIST SECULAR DEMOCRATIC REPUBLIC and to secure to all its citizens:         JUSTICE, social, economic and political;         LIBERTY of thought, expression, belief, faith and worship;         EQUALITY of status and of opportunity;         and to promote among them all         FRATERNITY assuring the dignity of the individual and the unity and integrity of the Nation;         IN OUR CONSTITUENT ASSEMBLY this twenty-sixth day of November, 1949 do HEREBY ADOPT, ENACT AND GIVE TO OURSELVES THIS CONSTITUTION."
    • Note 1: Words "SOVEREIGN SOCIALIST SECULAR DEMOCRATIC REPUBLIC" substituted for "Sovereign Democratic Republic" by the Constitution (Forty-second Amendment) Act, 1976, Sec. 2 (w.e.f. 3.1.1977).
    • Note 2: Words "unity and integrity of the Nation" substituted for "Unity of the Nation" by the Constitution (Forty-second Amendment) Act, 1976, Sec. 2 (w.e.f. 3.1.1977).

  • Part III — Fundamental Rights (Articles 12 to 35):

    • Right to Equality:
      • Equality before law and equal protection of laws.
      • Prohibition of discrimination on grounds of religion, race, caste, sex, or place of birth.
      • Equality of opportunity in matters of public employment.
      • Abolition of untouchability and abolition of titles.
    • Right to Freedom:
      • Protection of rights regarding freedom of expression, assembly, association, movement, residence, and profession.
      • Protection in respect of conviction for offences.
      • Protection of life and personal liberty.
      • Right to free and compulsory education for all children aged six to fourteen years.
      • Protection against arrest and detention in certain cases.
    • Right against Exploitation:
      • Prohibition of traffic in human beings and forced labour.
      • Prohibition of employment of children in factories, mines, or hazardous jobs.
    • Right to Freedom of Religion:
      • Freedom of conscience and free profession, practice, and propagation of religion.
      • Freedom to manage religious affairs.
      • Freedom as to payment of taxes for promotion of any particular religion.
      • Freedom as to attendance at religious instruction or religious worship in certain educational institutions.
    • Cultural and Educational Rights:
      • Protection of language, script, and cultural interests of minorities.
      • Right of minorities to establish and administer educational institutions.
      • Saving of certain laws (Articles 31A–31D).
    • Right to Constitutional Remedies:
      • Guarantees the right to move the Supreme Court and High Courts by appropriate proceedings for the enforcement of Fundamental Rights through directions, orders, or writs.