CBSE Class 10 Science Syllabus 2025-26: Detailed Unit-Wise Marks & Exam Pattern

The Central Board of Secondary Education (CBSE) has officially released the updated Science curriculum for the 2025-26 academic session. As students begin their journey toward the board exams, understanding the core structure and the weightage of each chapter is vital for academic success. Students can Download Official CBSE Class 10 Science Syllabus 2025-26 PDF directly to begin their structured preparation.

Exam Pattern and Assessment Structure

CBSE conducts a single annual board examination, eliminating the need for term-wise assessments. The final score is divided between a theory examination worth 80 marks and an Internal Assessment worth 20 marks. To excel, students should refer to the CBSE Class 10th syllabus to align their daily study habits with the official curriculum.

CBSE Class 10 Science Units and Mark Distribution

Units	Title	Marks
I	Chemical Substances-Nature and Behaviour	25
II	World of the Living	25
III	Natural Phenomena	12
IV	Effects of Current	13
V	Natural Resources	05
Total	Theory Examination	80
-	Internal Assessment	20
Grand Total	-	100

Core Curriculum Breakdown

Unit I: Chemical Substances - Nature and Behaviour

• Chapter 1: Chemical Reactions (Equations, types of reactions, oxidation/reduction)
• Chapter 2: Acids, bases, and salts (pH scale, properties, common compounds like Baking soda/Washing soda)
• Chapter 3: Metals & Non-metals (Reactivity series, ionic compounds, metallurgy)
• Chapter 4: Carbon compounds (Covalent bonding, nomenclature, soaps/detergents)

Unit II: World of Living

• Chapter 5: Life Processes (Nutrition, respiration, transportation, excretion)
• Chapter 6: Control and co-ordination (Nervous system, hormones, reflex actions)
• Chapter 7: Reproduction (Asexual/sexual, reproductive health, HIV/AIDS awareness)
• Chapter 8: Heredity and Evolution (Mendel's laws, sex determination)

Unit III & IV: Physics Focus

• Chapter 9 (Reflection & Refraction): Covers spherical mirrors, lenses, vision defects, and scattering.
• Chapter 10 (Electricity): Includes Ohm’s law, resistance, and heating effects.
• Chapter 11 (Magnetic effects): Covers solenoids, Fleming's Left Hand Rule, and circuits.

Internal Assessment Guidelines

The 20-mark internal assessment component is critical for your final grade. Students must perform continuous laboratory work throughout the year. It is mandatory to maintain a detailed portfolio that includes classwork and academic assignments completed during the session.

Next Steps for Students

Once you have familiarized yourself with the curriculum, plan your study schedule to cover the 5 core units effectively. Keep an eye on official announcements regarding the CBSE Class 10 Result 2025 to track your progress and final assessment benchmarks.

Related Links
CBSE Class 10 Syllabus 2024-25 | CBSE Class 10 Maths Sample Paper 2024-25
CBSE Class 10 Social Science Syllabus 2024-25 | CBSE Class 10 Hindi Syllabus 2024-25
CBSE Class 10 English Syllabus 2024-25

Frequently Asked Questions (FAQs)

Q1. Has CBSE Class 10 Science Syllabus 2025-26 been released?

Yes, the official CBSE Class 10 Science Syllabus for 2025-26 has been published and is available at www.cbseacademic.nic.in.

Q2. How many chapters are included in CBSE 10th Science Syllabus 2025-26?

The syllabus is organized into 5 major units covering the entire Class 10 Science curriculum for the 2025-26 academic year.

Q3. What is the benefit of knowing CBSE Class 10 Science Syllabus 2025-26 beforehand?

Reviewing the syllabus early helps students strategically plan their study schedule, prioritize important topics, and approach their board exams with greater confidence.