CBSE Class 8 Science Revision Notes
Maximize your exam preparation with our comprehensive CBSE Class 8 science notes. The class 8 syllabus is designed to provide students with a strong foundation in the basic principles of science (Physics, Chemistry, and Biology) and to encourage them to think scientifically. Which helps students to study smartly and get a clear picture of each and every concept discussed in their syllabus. The notes also contain neatly illustrated examples for easy revision of the important topics and some solved sample questions to understand better.
Enhance your CBSE Class 8 Science exam performance with GeeksforGeeks CBSE Notes. Our notes provide a clear and comprehensive understanding of the key concepts of Physics, Chemistry, and Biology. Save time and gain a comprehensive overview of each chapter with our well-structured and easy-to-follow format and boost your exam preparation, score higher marks, and study smarter with our CBSE Class 8 Science Notes.
Students can educate themselves on various subjects through the following resources:
CBSE Class 8 Science Revision Notes CBSE
- Chapter 1: Crop Production and Management
- Chapter 2: Microorganisms: Friend and Foe
- Chapter 3: Synthetic Fibers and Plastics
- Chapter 4: Materials: Metals and Non-Metals
- Chapter 5: Coal and Petroleum
- Chapter 6: Combustion and Flame
- Chapter 7: Conservation of Plants and Animals
- Chapter 8: Cell Structure and Functions
- Chapter 9: Reproduction in Animals
- Chapter 10: Reaching the Age of Adolescence
- Chapter 11: Force and Pressure
- Chapter 12: Friction
- Chapter 13: Sound
- Chapter 14: Chemical Effects of Electric Current
- Chapter 15: Some Natural Phenomena
- Chapter 16: Light
- Chapter 17: Stars and the Solar System
- Chapter 18: Pollution of Air and Water
Detailed Notes on CBSE Class 8 Science (Chapter Wise)
Unlock a seamless learning journey with our CBSE Class 8 Science study notes. Our notes offer a complete overview of all chapters with clearly illustrated examples for easy revision. Boost your exam preparation and score higher marks with our well-crafted notes organized into Physics, Chemistry, and Biology subjects. Experience an efficient learning experience with our CBSE Notes.
Chapter1: Crop Production and Management
Food is highly vital to humans, and we acquire it from plants and animals since we cannot synthesize our own food as plants do. It gives us the energy we need to accomplish our jobs and survive. Proper production management and distribution are required to produce food for a big population as our county’s regular production, and we will study more about it in this science chapter of Class 8 Crop Production and Management.
Food production and storage are covered in the first chapter of CBSE Class 8 Science. This chapter will teach you about various farming practices. The Science notes for CBSE Class 8 Chapter Crop Production and Management provide definitions for all of the chapter’s subjects, including soil preparation for crop production, sowing methods, manures, fertilizers, irrigation methods, crop harvesting, weed control, and crop storage.
- Agricultural Practices
- Basic Practices of Crop Production
- Preparation of Soil
- Agricultural Implements
- Adding Manure and Fertilisers
- Protection from Weeds
- Food from Animals
- Animal Husbandry
Chapter 2: Microorganisms: Friend and Foe
In this science chapter, we’re going to discuss microorganisms. Yes, those little friends (or foes in some cases) in our bodies help us survive with ease. There are also harmful microorganisms as well. The main microorganisms in and on our bodies are protozoa, algae, fungi, bacteria, and viruses. But do you know how significant microbes are in our environment? You will be able to understand everything about Chapter 2 of CBSE Class 8 Science notes through these revision notes.
This science chapter’s main topics are how microbes help in the production of curd and bread, how microorganisms are utilized commercially, how microorganisms promote soil fertility, and how bacteria are used in medicine. With our CBSE notes, you may go over every concept in this chapter again.
- Introduction of microorganisms
- Where do Microorganisms Live?
- Microorganisms and Us
- Medicinal Use of Microorganisms
- Increasing Soil Fertility and Cleaning the Environment
- Disease-causing Microorganisms in Humans
- Disease-causing Microorganisms in Animals and in plants
- Food Preservation
- Nitrogen Fixation
- Nitrogen cycle
Chapter 3: Synthetic Fibres and Plastics
You’ve probably heard that plastic is harmful to the environment. Right now aquatic lives are in danger because of plastics and it’s becoming a menace as it’s not bio-degradable. This science chapter will teach you everything you need to know about it and also about synthetic fibres (also known as man-made fibre). Synthetic fibres is usually a chain of small units joined together; each small unit is a chemical substance.
You should review topics like synthetic fibres and their types, features of synthetic fibres, qualities of plastics, and how plastics affect the environment using our free notes for CBSE Class 8 Science Chapter 3.
- Synthetic and Natural Fibers
- Types of Synthetic Fibres
- Polyethylene Terephthalate
- Characteristics of Synthetic Fibres
- What is Plastic?
- Biodegradable and Non-biodegradable Materials
- Plastic Pollution
Chapter 4: Materials: Metals and Non-Metals
This chemistry science chapter of CBSE Class 8 Science Notes explains the differences between metals and non-metals. In 8th standard science notes, we’re going to study elements that can be classified into 2 classes – metals material and non-metals materials where we’re going to cover the physical and chemical properties of metals and non-metals, displacement reactions, metal oxides, reactivity series, metal and nonmetal reactions, metal extraction, and ionic compounds.
- Metals, Non-metals, and Metalloids
- Properties of Metals, Non-metals and Metalloids
- Chemical Properties of Metals and Non-metals
- Reactivity Series of Metals
- Uses of Metals and Non-metals
Chapter 5: Coal and Petroleum
Coal and petroleum are used in our day-to-day lives without much of our notice. Coal is used as a fuel in both households and industries. It is also utilized in power plants to generate energy. Petroleum products (such as gasoline and diesel) are utilized as car fuels. Other items (such as kerosene and LPG) are utilized as residential cooking fuels.
In this science revision note, we’ll study natural gas, fossil fuels, and other natural resources. This science chapter explains how important natural resources are to us and how quickly they are disappearing in the ecosystem. The revision notes for CBSE Class 8 Science Chapter 5 will help you grasp concepts such as coal formation, petroleum, and natural gas, petroleum refining, forms of coal, oil extraction, and petroleum shortages and conservation.
- Exhaustible and Inexhaustible Natural Resources
- What are Fossil Fuels?
- Products of Coal: Coke, Coal Tar and Coal Gas
- What is Petroleum? – Occurrence, Refining, Formation, Uses
- Petroleum Products
- Fractional Distillation of Petroleum
- Sources of Energy – Natural Gas, Petrochemicals and Alternative Sources
Chapter 6: Combustion and Flame
Have you ever stood in front of a fire? Isn’t it fascinating? If there was no fire, you must have spotted a candle burning. Have you ever thought about viewing a candle’s flame and pondering how it burns and the structure of its flame? So to know how flame and combustion occur, we need to know which combustible substances react with oxygen and what the chemical process is.
This chemistry chapter will explain what combustion is and the many types of combustion. All of the definitions for combustible and non-combustible chemicals, candle flame, candle flame structure, forms of combustion, pollution, global warming, and CNG are included in the CBSE notes prepared by GeeksforGeeks for this chapter.
- Combustible and Non-combustible Substances
- What are the Conditions Necessary for Combustion?
- How do Safety Matches Work?
- Types of Combustion
- Combustion of Fuels – Definition, Types, Structure of Flame
Chapter 7: Conservation of Plants and Animals
This science chapter explains how we can conserve our planet by protecting plants and animals. It’s a crucial chapter that teaches you the truth about what’s going on in our surroundings.
Deforestation, causes of deforestation, conservation of forests and animals, biosphere reserve, flora and fauna, wildlife sanctuary, national park, red data book, migration, paper recycling, and reforestation are all covered in the CBSE notes for Class 8 Science Chapter 7 by GeeksforGeeks.
- Introduction Conservation of Plants and Animals
- Deforestation and It’s Causes
- Consequences of Deforestation
- Conservation of Forest and Wildlife
- Biosphere Reserve
- Flora and Fauna
- Endemic Species
- Wildlife Sanctuary
- National Park
- Recycling of Paper
- Red Data Book
Chapter 8: Cell -Structure and Functions
In this CBSE Science chapter, we’re going to discuss cells. A cell is the smallest living thing in the human organism, and all living structures in the human body are made of cells. There are hundreds of different types of cells in the human body, which vary in shape (e.g. round, flat, long and thin, short and thick) and size (e.g. small granule cells of the cerebellum in the brain (4 micrometres), up to the huge oocytes (eggs) produced in the female reproductive organs (100 micrometres) and cell function.
You will learn about cells, cell structure, and their functions in this science chapter. Definitions, pictures, and explanations for all topics in CBSE Class 8 Science Chapter 8 are included in the revision notes. Cell organelles, prokaryotic and eukaryotic cells, nuclei, chromosomes, DNA, and plastids are among them. The primary goal of this chapter is to explain the differences between plant and animal cells.
- Introduction cell-Structure and Functions
- Organisms show Variety in Cell Number, Shape, and Size
- Cell Structure and Function
- Cell Membrane
- Cytoplasm and Nucleus
- Difference between Plant Cell and Animal Cell
- Cell Organelles
Chapter 9: Reproduction in Animals
Do you know mammals like platypi and the echidna lay eggs on the contrary of giving birth to babies live? Yes, this is very surprising but science is all about discovering new things. There are many domestic animals with different sexual reproduction systems that you might not be aware of. But also asexual reproduction methods that can surprise you. Read more about Reproduction in Animals in this science chapter of CBSE Class 8 Science notes.
In this chapter, you’ll learn about asexual reproduction methods such as fission, budding, cell division, mitosis, and meiosis, as well as sexual reproduction. The male and female reproductive systems, as well as certain key concepts, are covered. The chapter’s notes provide all of the necessary information to ensure that you properly understand all of the chapter’s themes.
- Introduction of Reproduction
- Male Reproductive Organs
- Female Reproductive Organs
- Development of Embryo
- Viviparous and Oviparous Animals
- Young Ones to Adults
- Asexual Reproduction
- Types of Asexual Reproduction
Chapter 10: Reaching The Age of Adolescence
When you gradually grow and reach the age of adolescence and notice changes in your body, you might get confused and have questions about those body changes. Adolescence begins when your reproductive organs start maturing and this is called the onset of puberty.
This is another science chapter that is highly significant from a daily life aspect and will help you understand how our bodies change during adolescence. The key themes covered in this chapter are how hormones affect the human body, and various changes throughout puberty such as a change in voice increased height, change in body form, increased sweat gland activity, and gaining mental, emotional, and intellectual maturity. Our CBSE notes cover all of the topics in this chapter.
- Adolescence and Puberty
- Physical Changes at Puberty
- Secondary Sexual Characters
- Role of Hormones in Initiating Reproductive Function
- Reproductive Phase of Life in Humans
- How is the Sex of the Baby Determined?
- Hormones other than Sex Hormones
- Role of Hormones in Completing the Life History of Insects and Frogs
- Reproductive Health
Chapter 11: Force and Pressure
Have you ever wondered how tug of war works? Why is it regarded as the ultimate game for determining strength? Why do your teammates yell at you to use greater force in order to win the game? The game is a basic instance of opposing teams exerting push and pull forces. Are you studying the Force and Pressure chapter in Class 8 Science? Read on to learn about the key ideas taught in Class 8 Force and Pressure in this physics chapter, as well as science notes and NCERT solutions.
This chapter consists of two parts Force and Pressure respectively, Force includes basic concepts, types, properties/characteristics of forces, Friction, and its different types, etc. While, the section on Pressure comprises Basic concepts, Types of Pressure and Buoyancy, etc which are explained in the articles listed below:
- What is Force?
- Push and Pull Force
- Interaction of Forces
- Types of Forces
- Exploring Forces
- Contact and Non-Contact Forces
- Change in State of Motion
- What is Pressure?
- Types of Pressure
- Fluid Pressure
- Atmospheric Pressure
- Hydrostatic Pressure
Chapter 12: Friction
Have you ever noticed the sole of your old shoes, the tyre of your old bicycle, and other parts of the machines that move on a regular basis? If so then you have definitely seen that after some time they tend to wear off and after some time become useless this is because of the force called friction. Friction is the force which acts between two surfaces in contact and it always acts opposite to the direction of the motion.
- Force of Friction
- Factors Affecting Friction
- Friction: A Necessary Evil
- Increasing and Reducing Friction
- Wheels Reduce Friction
- Rolling Friction
- Sliding Friction
- Fluid Friction
- Types of Friction
- Static and Kinetic Friction
- Limiting Friction
Chapter 13: Sound
Sound is something that can be heard from anything like Television, aeroplane, etc. Scientifically, Sound can be defined as an energy form that propagates in the form of waves and is produced by vibrations.
In this physics science chapter and physics notes, we’re going to learn about Sound a type of energy that is produced by vibrations. These vibrations produce sound waves, which travel across media like air and water before reaching our ears. Understand how sound waves are created by vibrations in the form of compression and rarefaction, and how your ears allow you to hear them.
- Sound Produced by a Vibrating Body
- How is Sound Produced by Humans?
- Sound Needs a Medium for Propagation
- How do we hear?
- Amplitude, Time Period, and Frequency of a Vibration
- Pitch and Loudness
- Audible and Inaudible Sounds
- Noise and Music
- Noise Pollution
Chapter 14: Chemical Effects of Electric Current
When you hear the word electric current, you must be thinking about things like an electric bulb or electric rod among other things. But do you know what’re the chemical effects that happen while creating electric current? In this science chapter, we’re going to study what effect electricity and other important physics topics.
The fourth science chapter of Physics in the Science notes in the NCERT textbook comes up is called Chemical Effects of Electric Current. Electric Current is the rate of the flow of electrons or charges in a conductor. Therefore, the passage of electric current through a conducting solution results in chemical reactions.
This chapter builds a basic idea of electricity, which will be studied in later classes. As this chapter helps develop a general idea, we will learn about electroplating and the chemical changes that occur when electricity flows through the liquid and its applications. The topic discussed are listed below:
- Good Conductors and Poor Conductors of Electricity
- Do Liquids Conduct Electricity?
- Bases and Salts are Good Conductors
- Chemical Effects of Electric Current
- Electrolysis of Water
- What is Electroplating?
Chapter 15: Some Natural Phenomena
A natural phenomenon can be defined as a naturally occurring calamity or physical process. In this science chapter, we’re going to understand how natural phenomena occur – be it lightning or earthquake. You might come across some destructive natural phenomena or normal ones and all of them have reasons behind them. This is why it’s crucial to study physics to understand how such phenomena charge.
Some Natural Phenomena is the fifth science chapter of Class 8 Physics. As the name of the chapter suggests Some Natural Phenomena, therefore, it explains some naturally causing phenomena like lightning, earthquake which are destructive to some extent. Thus, the topics covered in this chapter come up with the basic idea of Lightning and Earthquakes, the destruction caused by them, how they occur and measures to be taken during them. These concepts are discussed in the following articles:
- What is Lightning?
- How does Lightning work?
- Charging by Rubbing
- Types of Charges and Their Interaction
- Electric Charge
- Earthquake – Definition, Causes, Effects, Protection
- What causes an Earthquake?
Chapter 16: Light
You see a thousand things on daily basis but have it ever piqued your interest in how you’re able to see and why everything is not black? Light is the answer to this. In this physics chapter, we’re going to understand concepts of reflection and refraction and many more things.
The sixth chapter in the Class 8 Physics syllabus is Light. Light class 8 is a form of energy that enables us to see our surroundings when it gets reflected from objects around us. Light is emitted from a source such as the Sun. The term usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight.
This chapter helps to develop the general and basic concept of Optics (a branch of Physics). According to the CBSE Class 8 Science Notes, here we have covered topics like the concept of Reflection, Laws of Reflection, Types of Reflection, Structure, and Working of the Human Eye, and Dispersion of Light, etc. are discussed in the following articles listed below:
- Laws of Reflection
- Regular and Diffused Reflection
- Multiple Reflections of Light
- Sunlight — White or Coloured
- Dispersion of Light
- Human Eye
- Braille System
Chapter 17: Stars and The Solar System
The celestial objects you see during the night in the sky are not just a matter of some particles. They’re part of our solar system. In this science chapter, we’re going to look at stars and celestial objects including mercury venus, and other planets.
The last chapter of CBSE Class 8 Science Notes is Stars and the Solar System which leads one to go to infinity and beyond. Topics covered are celestial objects, Sun, comets, astronomy, planets, meteors, and meteorites, the moon, satellites, meteor showers, stars, Astronomy in ancient India, artificial satellites, constellation, and Mangalyaan which are discussed in the following articles listed below:
- What is a Star? Formation, Life Span, Constellations
- The Moon – Facts, Phases, Surface, Eclipse
- The Solar System
- Artificial Satellites
Chapter 18: Pollution of Air and Water
Air is very important to survival and is one of the important elements in the atmosphere. However, our air levels are getting polluted day by day due to different factors like smog, industrial pollution, etc. Hence causes air pollution and even water pollution which are the topics we’re going to cover in this CBSE Class 8 Science Notes.
This science chapter discusses topics such as air pollution, its causes, the consequences of air pollution on the Taj Mahal, global warming, the greenhouse effect, the effects of global warming, and methods to prevent air pollution. Water contamination, causes of water pollution, and potable water are all covered in this chapter. This chapter’s notes provide comprehensive assistance on all of the chapter’s subjects.
- What is Air Pollution? Definition, Types, Causes, Prevention
- Chlorofluorocarbons and Ozone Depletion
- What are the Effects of Acid Rain on Taj Mahal?
- What is Global Warming? – Definition, Causes, Effects and Impacts
- Water Pollution – Definition, Causes, Prevention
- Prevention of Water Pollution
CBSE class 8 science notes are a crucial tool for students in their exam preparation. With our CBSE science notes, students can easily focus on their subjects – Physics, Chemistry, and Biology – and retain knowledge effectively. The well-crafted notes, with neat examples, provide a complete overview of all the chapters for quick revision. By using our CBSE class 8 science notes, students can achieve higher marks in exams and experience a smooth learning journey.
Frequently Asked Questions on CBSE Class 8 Science Notes
Q. How do I get a good score in science class 8?
Answer: Following are some tips and tricks that will help the students in achieving a good percentage in their Class 8 Science exam:
- The first step toward getting good grades is to read and go through the syllabus.
- The most important thing to remember when studying for tests is to rely on self-study. Study by yourself and seek help from teachers if you have any doubts.
- Students must study from NCERT and reference books, which will help them understand various concepts and chapters.
- You cannot study for more than 4 – 5 hours at a time. As a result, it is best to study for 2–3 hours at a time, with short rests in between.
Q. Is the NCERT book enough for CBSE Class 8 Science?
Answer: For Class 8 Science, CBSE recommends NCERT books. However, if you want to get full marks in Class 8 Science exams, you must go beyond the NCERT textbook. You’ll require thorough NCERT Solutions for Class 8 Science, as well as CBSE Notes for Class 8 Science, NCERT Exemplar solutions, practice papers, and crucial questions.
Q: Which book is best for Class 8 Science?
Answer: You can use Lakhmir Singh’s reference book and Together With Science books in addition to the NCERT textbook for Class 8 Science. You should also practice NCERT Exemplar problems to ensure that you understand all of the principles.
Q. Is Class 8 Science easy?
Answer: The difficulty level of Class 8 Science can vary depending on individual students’ strengths and weaknesses. However, having access to comprehensive and well-structured Class 8 Science notes can make the subject easier to understand and study.
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