NCERT Solutions for Class 8 Science CBSE

Find the best resources for exam revision in TopperLearning’s NCERT solutions for CBSE Class 8 Science. Learn diverse topics such as constellations, pollution, friction, plant cell, and more with these solutions. While you can create notes from the textbook for the NCERT questions, it is good to have accurate CBSE Online Class 8 solutions from subject experts for quick reference. 

You just need to visit our study portal to check the chapter-wise answers in our NCERT CBSE Class 8 Science textbook solutions. And the concept insights in NCERT come as a value addition to give you more clarity of the topics that are part of your CBSE Class 8 syllabus. Science as a subject is easy or difficult depending on how you perceive it. If your concepts are clear and you can remember the required formulae, you’re good to go. However, the ease or difficulty of the subject depends on how well you can remember the topics you learned during revision. 

While going through Class 8 NCERT Science textbook solutions, you will come across practical applications of many Science-based concepts. The diagrams in the answers further support you to grasp concepts. Our NCERT CBSE Class 8 Science solutions will not only help you to understand those concepts but will also help you to apply them in real life. For exam preparation, do take a look at our solutions for CBSE Class 8 sample paper 2020-21.

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NCERT Solutions Science

NCERT Science VIII 2020

NCERT Solutions for Class 8 Science

Chapter 1 - Crop Production and Management

Basic Practices of Crop Production 

1. Preparation of soil

•Ploughing: It is the process of breaking, loosening and turning the soil over for uprooting weeds and aerating the soil. It is done using plough, hoe or cultivator.

•Harrowing: It is a method to destroy germinating weeds. It is done by using a blade harrow or spike tooth harrow.

•Levelling: It involves breaking big lumps of soil and levelling it. It is done by using a wooden or iron plank.

•Manuring: It is the process of adding manure to the soil.

2. Sowing

•The process of scattering seeds in the soil for growing crop plants is called sowing.

•Broadcasting: It is the process of manually scattering seeds in the field.

•Drilling: It is the process of sowing seeds at a uniform distance by using a seed drill.

•Transplantation: The process of transferring seedlings from the nursery to the main field by hand is called transplantation.

3. Adding manure and fertilisers

•Manure: Dead and decaying vegetable matter, waste from farms, household waste, excreta of animals form manure.

•Compost: Organic substances are decomposed by bacteria and are converted into humus. 

•Green Manure: Farmers grow leguminous plants such as groundnuts, soya beans and pulses in between two crops.

•Crop rotation is the practice of growing different crops each season in a particular field.

•Organic farming is a kind of farming in which crops are grown without using chemical fertilisers and pesticides.

4. Irrigation

•The process of supplying water to crop plants in fields through canals, wells, reservoirs, tube wells etc. is known as irrigation.

•Traditional methods of Irrigation: Canal irrigation, moat, Rahat system, swing basket method, dhekli, chain pump.

•Modern methods of Irrigation:

•Basin irrigation: The land is surrounded with embankments in the form of a basin. Basins are flooded with water.

•Furrow irrigation: Small channels or furrows are created along the field length between crop rows.

•Drip irrigation: Water is supplied through perforated pipes.

•Sprinkle irrigation: Sprinklers or spray guns are attached to a large hosepipe at regular intervals to spray water.

5. Removal of weeds

•Wild and undesirable plants which grow in crop fields and compete with crops for space, soil, nutrients, water and sunlight are called weeds.

•Weeding is the process of removal of weeds.

•Pulling out weeds with hands.

•By digging or cutting weeds from close to the ground using trowel, harrow and hoe.

•Spraying a solution of weedicides such as 2,4-D, MCPA and Butachlor.

6. Harvesting

•Harvesting is the cutting and gathering of mature crops. 

•Threshing is the process of beating grains from stems. 

•Winnowing is the process of separating grains from the chaff.

7. Storage of food grains

•Dried grains are stored in granaries. 

•Grains are also stored in gunny bags made of jute. 

•Government stores grains in large containers or tall cylindrical structures called silos. 

In the NCERT solutions for CBSE Class 8 Science Chapter 1 Crop Production and Management, you will learn the various techniques for preparing soil and sowing seeds. The key concepts in this chapter also include animal husbandry and food sources from animals. Learn about the types of crops to understand how cultivation is carried out by farmers. Find ways on how to improve crops by studying with our NCERT chapter solutions.

Read the answers to the exercises on page 14 of your CBSE Class 8 Science NCERT textbook to find out about the difference between manure and fertilizers. Are fertilizers harmful? Read all about it with the explanations and concept insight given in the NCERT solutions. Read about Kharif crops and Rabi crops. What’s the difference between them? Get all the answers in the NCERT textbook solutions.

Revise the cropping patterns in India with our NCERT CBSE Class 8 Science textbook solutions. Learn about farming methods such as Tilling, Threshing, Weeding, and more. Understand the different agricultural practices by revising the sugarcane crop production process. Review the answers to objective-type questions by referring to the solved CBSE Online Class 8 questions from your NCERT textbook. 

Sometimes, instead of fill in the blanks, you may get a set of questions in a crossword form. Learn to solve such puzzles by revising the NCERT CBSE Class 8 Science solutions at TopperLearning.

 

Chapter 2 - Microorganisms: Friend or Foe

When you revise the NCERT solutions of CBSE Class 8 Science Chapter 2 Microorganisms: Friend or Foe at TopperLearning, you will come across concept insights that will tell you more about the concepts being discussed. The concept insights will also alert you about the questions that are important from the exam viewpoint. In Chapter 2, learn about yeast, bacteria, fermentation and other topics. Did you know all microorganisms are not bad? Yes, there are useful microorganisms too. Discover more about microorganisms in Chapter 2 of your CBSE Class 8 syllabus.

NCERT Solutions for Class 8 Science Chapter 2 will assist you to understand the different types of microorganisms. Study in detail about microorganisms such as fungi, algae, protozoa and bacteria. Find out which microorganisms are good and which microorganisms are considered harmful. Also, know the various methods for preserving food. 

Houseflies are common carriers of communicable diseases. Understand more about communicable diseases with the NCERT solutions for CBSE Class 8 Science. Learn all about the harm that can be caused by the bad microorganisms and how to prevent them with help of good microorganisms. Additionally, in the chapter solutions, understand how antibiotics help to protect you against bad microorganisms.

 

Chapter 3 - Synthetic Fibres and Plastics

1)Synthetic Fibres

• A synthetic fibre is a long chain of small units joined together, and each small unit is actually a chemical substance. 

• A polymer is a very big molecule formed by the combination of a large number of small molecules.

•The word polymer comes from two Greek words poly meaning many and mer meaning units.

•The small molecules which join to form a polymer are called monomers.

 Types of Synthetic Fibres

 Rayon

•Rayon is often regarded as artificial silk.

•It is a man-made fibre prepared from a natural raw material called cellulose by chemical treatment.

 Nylon

•Nylon is the first fully synthetic fibre made by man without using any natural raw materials.

 Polyester

•Polyester is a synthetic fibre.

•Polyester (poly + ester) is made of repeating units of a chemical called an ester.

•Terylene is a popular polyester fibre.

•Polyester fabric is strong and wrinkle resistant.

 Acrylic

•Because of its wool-like feel, acrylic fibre is often used as a substitute for wool.

•It is used for making sweaters, shawls, blankets, jackets, sportswear, socks, furnishing fabrics and carpets.

 

2)Plastics

•Plastics are also polymers.

•It is a synthetic material which can be moulded into desired shape when soft and then hardened to produce a durable article.

•Plastic does not have the same type of arrangement. Sometimes, it is linear, whereas in others, it is cross-linked.

  

Linear (Thermoplastics)Cross-linked (Thermosetting plastics)

 

•Plastics are of two types:

 

i.Thermoplastics

A plastic which can be softened repeatedly by heating and can be moulded into different shapes again and again is called a thermoplastic. Example: Polythene and PVC 

ii.Thermosetting plastics

A plastic which when set does not become soft on heating again and cannot be moulded a second time is called a thermosetting plastic. Example: Bakelite and melamine 

 Revise concepts such as synthetic fibres and types of synthetic fibres in the NCERT CBSE Class 8 Science textbook solutions Chapter 3 Synthetic Fibres and Plastics. You will learn about the properties of fibres such as rayon, nylon, acrylic and polyester. Also, understand the advantages and disadvantages of synthetic materials such as plastics through the NCERT Science book Class 8 solutions.

Get solutions for all 12 questions on Page 41 from your NCERT textbook at TopperLearning. Understand what synthetic fibres are and what are the features of nylon fibres. Experienced Science teachers have provided accurate answers for the CBSE Class 8 Science NCERT book questions.

Can you easily bend thermosetting plastic? Why are saucepan handles made of thermosetting plastic? Can plastics be good conductors of electricity? The free textbook solutions from carry the answers to these Science questions. Revise the CBSE Online Class 8 solutions to understand what kinds of plastics can be recycled. Also, learn why chemicals don’t cause corrosion in plastics.

 

Chapter 4 - Materials: Metals and Non-Metals

The NCERT solutions for CBSE Class 8 Science Chapter 4 Materials: Metals and Non-Metals will help you with questions asking you about the physical properties and uses of metals and non-metals. Find out what will happen when metals come in contact with water, oxygen, acids and bases. Also, revise the concept of the displacement reaction.

     

Elements can be divided into metals and non-metals on the basis of their physical and chemical properties.   

Physical Properties of Metals and Non-metals

Physical Property

Metals

Non-metals

Malleability

·         Metals are malleable.

·         Non-metals are not malleable.

Ductility

 

·         Metals are ductile, i.e. they can be drawn into thin wires.

·         Non-metals are not ductile, i.e. they cannot be drawn into wires.

Conductivity

 

·         Metals are good conductors of heat and electricity.

·         Non-metals are poor conductors of heat and electricity.

Sonority

 

·         Metals are sonorous.

·         Non-metals are not sonorous.

Lustre

 

·         Metals are lustrous or shiny.

·         Non-metals are dull and not lustrous.

 

*      Displacement Reactions

·         A more reactive metal displaces a less reactive metal from its salt solution.

Example: Reaction of iron metal with copper sulphate solution

CuSO4 + Fe  ® FeSO4 + Cu 

In this reaction, a more reactive iron displaces a less reactive copper from its salt solution, i.e. copper sulphate. A less reactive metal cannot displace a more reactive metal from its salt solution.

 Example: Reaction of iron metal with zinc sulphate solution

      ZnSO4 + Fe  ® No displacement reaction

 Iron metal is less reactive than zinc metal. So, a less reactive iron metal cannot displace a more  reactive zinc metal from zinc sulphate solution.

 

*      Uses of Metals

·         Aluminium metal in the form of alloys is used to make aeroplanes.

·         Zinc metal is used for galvanising iron to protect it from rusting.

·         Silver and gold metals are used to make jewellery.

 

*      Uses of Non-metals

·         Oxygen is a non-metal which is used by plants and animals for breathing.

·         Nitrogen is a non-metal which is used in the manufacture of fertilisers to enhance the growth of plants.

·         Chlorine is a non-metal which is used in the water purification process.

·         Sulphur is a non-metal which is used in the vulcanisation of rubber.

 Get a deeper understanding of the properties of metals and non-metals. Get answers for True or False questions from the CBSE Class 8 Science NCERT textbook. Revise what happens in displacement reactions while learning about elements. Also, get introduced to litmus paper tests in this chapter. Knowledge of Science facts will also improve your general knowledge and help you win quiz competitions based on Science topics. 

Find answers on how gold is polished based on the scientific knowledge available about metals. This CBSE Class 8 Science chapter includes numerous such scientific facts that will make you a smarter person. That’s not all, knowledge of sodium, copper, coal, etc. will make it easier for you to understand Chemistry concepts in your higher classes. 

  Chapter 5 - Coal and Petroleum

Natural resources can be classified into two types:

•Inexhaustible Natural Resources: The resources which are present in unlimited quantity in nature and are not likely to be exhausted by human activities are called inexhaustible natural resources.

        Examples: Sunlight, air

•Exhaustible Natural Resources: The resources which are present in a limited quantity in nature and can be exhausted by human activities are called exhaustible natural resources. 

         Examples: Forests, wildlife, minerals, coal, petroleum

Fossil fuels: The natural fuels formed from the remains of living organisms buried under the Earth long, long ago are called fossil fuels.

 Coal is a hard, black, combustible mineral which consists mainly of carbon.

•It is found in deep coal mines under the surface of the Earth.

•On heating, coal, which is mainly carbon, produces carbon dioxide gas and a lot of heat energy.

C    +     O2         ®   CO2      +   Heat   

 Products of Coal

i.Coke

ii.Coal Tar

iii.Coal Gas

 

 Petroleum

•It is a dark-coloured, thick crude oil found deep below the ground in certain areas.

•Petroleum means rock oil (petra = rock, oleum = oil).

•Just like coal, petroleum is also a fossil fuel.

 

 

 Constituents of Petroleum and their Uses

Constituents of PetroleumUses

 Liquid Petroleum GasFuel for home and industry

PetrolMotor and aviation fuel, solvent for dry cleaning

KeroseneFuel for stoves, lamps and jet aircraft

DieselFuel for heavy motor vehicles, electric generators

Lubricating oilLubrication

Paraffin waxMaking ointments, candles, Vaseline 

BitumenIn paints and road surfacing

 

 Natural Gas

•Natural gas mainly consists of methane with small quantities of ethane and propane.

•When natural gas is compressed by applying pressure, it is called compressed natural gas (CNG).

•It is a very important fossil fuel because it is easy to transport through pipes.

 

•It is a clean fuel.

 

With our NCERT solutions for CBSE Class 8 Science Chapter 5 Coal and Petroleum, get descriptions on how coal tar, coal gas and coke are produced from coal. This chapter also covers the limited availability of natural resources and the need for the careful usage of resources for a sustainable future.

What is Bitumen? How does it help us? Find answers in the NCERT solutions for Class 8 Science free textbook solutions. Understand the key benefits of Liquefied Petroleum Gas or LPG and Compressed Natural Gas or CNG. Get the answers to true or false type questions in your textbook too. Our solutions are loaded with concept insights to make it easy for you to understand the concepts. 

Read our NCERT Class 8 Science solutions to understand the preparation method of Kerosene. In addition, the solutions give you accurate explanations of topics like fossil fuels, petroleum and coke. With the availability of the solutions online 24x7, you can revise the chapter at any time as per your learning plan. To understand what kinds of questions were asked in the questions recently, check the CBSE Class 8 sample paper 2020-21.

 

Chapter 6 - Combustion and Flame

            ·    A chemical process in which a substance reacts with the oxygen of the air to give heat and light is called combustion.

Magnesium   + Oxygen          Magnesium oxide + Heat + Light

Types of Combustion

Rapid Combustion: The reaction in which a large amount of heat and light are produced in a short period of time

Spontaneous Combustion: The reaction which occurs on its own

Explosive Combustion: A very fast combustion in which a large amount of heat, light and sound are produced is called explosive combustion.

 

*   Flame and Structure of Flame

A flame is a region where the combustion or burning of gaseous substances takes place along with the evolution of heat and light.

 

Different zones of candle flame

Inner zone

·         This is the dark zone which lies around the wick of the candle. It is the innermost zone of the flame.

Luminous middle zone

·         The middle zone is the brightest zone of flame. In this zone, there is an inadequate supply of air.

Non-luminous zone

·         The outermost zone of the flame is called the zone of complete combustion.

·         This is the hottest zone of the flame.

Blue zone

·         At the bottom of the flame lies a blue zone.

Fuels

·         The material which is burnt to produce heat is called a fuel.

Examples: Wood, coal, LPG, kerosene, petrol, diesel, natural gas and biogas are some common fuels.

·         There are three types of fuels:

v  Solid fuels

v  Liquid fuels

v  Gaseous fuels

Fuel Efficiency

·         Different fuels produce different amounts of heat on burning.

·         The amount of heat produced by the complete burning of 1 kilogram of a fuel is called its calorific value.

 

·         The calorific value of a fuel is expressed in the unit of kilojoules per kilogram.

In the NCERT solutions for CBSE Class 8 Science Chapter 6 Combustion and Flame, study combustible and non-combustible gases. Find out why goldsmiths use the outermost part of the flame to melt gold and silver. Discover the meaning of terms such as flame, combustion, fuels, fire and burning. Revise the various types of combustion with our CBSE Online Class 8 solutions.

Revisit the lessons on the process of combustion in this chapter. Understand what an ignition temperature is. Grasp the difference between wood and LPG. Through the CBSE Class 8 Science sample paper and NCERT solutions, brush up your understanding of heat generated in a burning candle. Revise the calorific value of a fuel. 

The CBSE syllabus for Class 8 Science becomes more and more interesting in this chapter as it reveals the scientific facts about things that leave you in awe. For example, find out why dry leaves are used to create fire instead of green leaves. 

 

Chapter 7 - Conservation of Plants and Animals

•Deforestation is cutting down of trees or destroying forests to use the land for some other purpose.

•Reforestation is restocking of destroyed forests by planting new trees. 

•A species is an organism of a particular kind whose members can interbreed among themselves to produce fertile young ones

•Rare species exist in relatively low numbers but are not necessarily in immediate danger of extinction. Examples: Black and white ruffed lemur, Aloe polyphylla.

•An endangered species is one in which the population of organisms is at the risk of extinction. Examples: The Indian rhinoceros, the Great Indian bustard, Pink Butterfly Orchid.

•Species which exist in low numbers and may become endangered due to destruction of their habitat, overexploitation or due to some other environmental factor are called vulnerable species. Examples: The Asian elephant, Rafflesia.

•Threatened species are any species which are vulnerable to endangerment in the near future. Examples: Giant Panda, Monarch butterfly.

•Plant and animal species which are found only in a particular region and nowhere else in the world are called endemic species. Examples: Nilgiri leaf monkeys found in the Nilgiri Hills of the Western Ghats.

•A species is considered extinct when no member of the species is still alive. Examples: Dodo, Woolly Mammoth.

•Biosphere reserves or biodiversity zones are large areas of protected land for the conservation of wildlife, plant and animal resources and the traditional life of tribal people living in the area. 

•Plants naturally occurring in a particular area constitute the flora. Teak, Jamun, Fern, Mango and Arjun constitute the flora of Pachmarhi Biosphere Reserve.

•Animals naturally occurring in a particular area constitute its fauna. Cheetah, Wolf, Leopard, Chinkara, Blue bull, Barking deer and Wild dog constitute the fauna of Pachmarhi Biosphere Reserve.

•A zoo is a place where wild animals and birds live in artificial habitats such as cages and enclosures.

•A wildlife sanctuary is an area where animals are protected from any kind of disturbance such as hunting, predation and competition. 

 

•National parks comprise a large area of land owned by the government which is restricted from development and is protected for its landscape, flora, fauna and ecosystem on the whole.

NATIONAL PARK

STATE

NATIONAL PARK

STATE

Corbett National Park

Uttarakhand

Sunderbans National Park

West Bengal

Kanha National Park

Madhya Pradesh

Bandipur National Park

Karnataka

Ranthambore National Park

Rajasthan

Dachigam National Park

Jammu and Kashmir

Gir National Park

Gujarat

Sariska National Park

Rajasthan

Kaziranga National Park

Assam

Satpura National Park

Madhya Pradesh

 

·      Red Data Book keeps a record of all the endangered animals and plants.

·      The movement of animals in large numbers from one place to another to overcome unfavourable conditions is called migration. Siberian cranes migrate to Bharatpur in Rajasthan because the environmental conditions there are more favourable as compared to Siberia, the place where they actually come from.

·      Paper recycling is the process of remaking new paper products from waste paper.

   

Through the NCERT solutions for CBSE Class 8 Science Chapter 7 Conservation of Plants and Animals, revise the concepts of deforestation and reforestation. Find answers on what are the differences between a zoo, a biosphere reserve and a wildlife sanctuary. Also, get answers on concepts such as flora, fauna, endangered species and extinct species.

Revise the NCERT CBSE Class 8 Science solutions by qualified teachers with huge experience in the field of education. These reputed teachers guide you with answers on Biosphere reserves, wildlife sanctuaries, zoos, and more. The chapter tells you about the types of species and why certain species fall under the extinct category. 

Also, understand the terms flora and fauna with the examples given by our subject experts. The CBSE syllabus for Class 8 Science Chapter 7 also covers important details on global warming, green wealth, deforestation, ecological balance, and more. In this Science chapter, understand the significance of the conservation of forests and how animal poaching impacts forests. Explore CBSE Class 8 Science sample papers to practise different types of questions from this chapter.

 

Chapter 8 - Cell – Structure and Functions

 

Cell Structure and Functions

In this chapter, one will not only learn about what cells are but also the structural organisation of cell.

·       Structural Organisation of a Cell

 

CELL ORGANELLES

1.    Plasma membrane/Cell membrane

·        Forms the outermost covering in animal cells

·        Acts as an effective barrier and regulates the entry of substances in and out of the cell

2.    Cell wall (in plant cells only)

·        Situated just outside the plasma membrane

·        Gives rigidity and shape to plant cells

3.    Cytoplasm

·        Transparent jelly-like material

·        Centre of all metabolic activities

4.    Nucleus

·        Largest cell organelle, mostly spherical and dense

·        Nuclear membrane with pores, which allow substances to enter and leave the nucleus

·        Contains chromosomes, made of genes, which control hereditary characteristics

5.    Nucleolus

·        Embedded within the nucleus of the cell.

·        Participates in protein synthesis by forming and storing RNA

6.    Chromatin fibres

·        Network of thread-like structures made of DNA

·        Chromosomes carry hereditary information or genes

7.    Vacuoles

·        Fluid-filled membrane bound spaces

·        Storage of water and other substances, food, pigments and waste products

8.    Plastids

·        Three kinds of plastids.

·        Chromoplasts: Impart colour to flowers and fruits

·        Chloroplasts: Trap solar energy for photosynthesis

·        Leucoplasts: Store starch

 

·       Study of Plant and Animal Cells

 

·       Similarities between Plant and Animal Cells

*      Presence of cell membrane

*      Presence of cytoplasm

*      Presence of nucleus

*      Presence of nuclear membrane

*      Presence of mitochondria

Watch this video to understand a crucial concept on cell.

 

Study the accurate answers on the structure and functions of an animal cell and plant cell in the NCERT CBSE Class 8 Science textbook solutions Chapter 8 Cell – Structure and Functions. Learn to list the differences between eukaryotes and prokaryotes. Revise concepts such as amoeba, unicellular organisms etc. with TopperLearning’s NCERT solutions for Class 8 Science.

Do you know how unicellular organisms are different from multi-cellular organisms? Are you aware of the purpose of nerve cells? Refresh the answers to these questions and some basic concepts on the structure of cells from earlier lessons. Revise the diagram of a plant and animal cell. The diagrams explain the features of the different types of cells and support you to write detailed answers on cells.

Also, go through the comparison of eukaryotes and prokaryotes in this chapter. Revise the concept of chloroplasts and figure out where these plastids can be found. Our CBSE Class 8 science textbook solutions give you answers to crossword type questions from the NCERT textbook as well.

 

Chapter 9 - Reproduction in Animals

Use our NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals to understand the difference between a zygote and a foetus. This chapter will take you through the process of human reproduction and fertilisation. Also, find out how living organisms produce offspring. Learn about sexual and asexual reproduction. 

Looking for answers to NCERT CBSE Class 8 Science textbook questions on page 110? We’ve got answers for all 9 questions on the page by some of the highly experienced teachers in India. Understand the various types of fertilization with well-prepared solutions.

In the Science exam, you will be asked different kinds of questions that are covered in your NCERT textbook. These include crossword questions, true or false questions and more. So, revise the free textbook solutions as per the CBSE Class 8 syllabus to prepare for those questions. Get the required learning materials on the topic of reproduction in animals and get ready for your class tests and final exam. 

 

Chapter 10 - Reaching the Age of Adolescence

NCERT solutions for CBSE Class 8 Science Chapter 10 Reaching the Age of Adolescence aims to give you answers on what are the chemical and physical changes which take place in humans when they reach the age of adolescence and puberty. It also gives students insight into the topics of hormones and reproduction that are covered in this chapter.

Different phases in the life of human beings bring about a certain change in their physical characteristics. Adolescence is a time when humans are transitioning to adulthood. Learn everything about this phase in the CBSE Class 8 Science Chapter Reaching the Age of Adolescence. Understand what happens when boys and girls reach the stage of reproductive maturity.

The chapter educated you about important concepts such as puberty and mensuration. Revise the lessons on the human endocrine system with the NCERT CBSE Class 8 Science textbook solutions. The chapter also informs you of the role of sex hormones in the human body. Also, understand how adolescence results in the development of sexual characters in boys and girls.

 

Chapter 11 - Force and Pressure

Force

•Force is a push or a pull on an object. 

•It changes or tends to change the state of rest or the state of motion of an object by a push or pull.

•The SI unit of force is Newton. 

 

Effects of Force 

•A force can change the state of motion of an object. 

•A force can change the shape and size of the object. 

 

Types of Forces 

Contact Forces

•A force which can cause or change the motion of an object by physical touching is called a contact force.

 

Types of Contact Forces

1.Muscular Force

•The force caused by the action of muscles is called muscular force.

2.Friction

•The force responsible for changing the state of motion of an object is called friction. 

Non-contact Forces

•These forces act at a distance without any physical contact.

 

Types of Non-contact Forces

1.Magnetic Force

•The force exerted by a magnet is known as magnetic force.

 

2.Electrostatic Force

•The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.

 

3.Gravitational Force

•The attraction of objects towards the Earth is known as force of gravity or gravity.

•This force acts on all objects in the Universe.

 

Pressure

•Pressure is the force per unit area applied in a direction perpendicular to the surface of an object.

•It is given as

 

•The unit of pressure is Newton/metre2 (N/m2 or Nm−2), which is equal to 1 Pascal (Pa). 

•A liquid exerts pressure on the base of the container (vessel) because of its weight.

 

In the NCERT solutions for CBSE Class 8 Science Chapter 11 Force and Pressure, get answers on how the force works and understand what is contact force and non-contact force. Revise the concepts like atmospheric pressure, electrostatic force, gravitational force, muscular force etc. that are covered in your NCERT Science book CBSE Class 8 syllabus.

Study your CBSE Class 8 Science lessons on gravity and friction in this chapter. The NCERT book covers several questions on force and friction. Understand these concepts with examples and concept insights presented by subject experts in our NCERT solutions. This chapter will educate you about the different types of force such as muscular force, electrical force and so on.

Does force have a direction? How is the knowledge of force applied in real life? Understand the answers with TopperLearning’s NCERT solutions for CBSE Class 8 Science. The study resources like CBSE Class 8 sample paper 2020-21 that you find at our e-learning portal are reliable as these are prepared by some of the best teachers around. You can access and revise these textbook solutions at your convenience by visiting our study portal.

 

Chapter 12 - Friction

NCERT solutions for CBSE Class 8 Science Chapter 12 Friction will help you to find out what affects friction and what causes friction. Find out what are the advantages and disadvantages of friction, how friction affects a moving car or aeroplane etc. Gear up your exam preparation by practising CBSE Class 8 Science sample papers and solutions.

Learning topics like friction will open your eyes to amazing Science facts that explain why a book slides when it is kept on a titled writing desk. This chapter will tell you why sports shoes have spikes and why tyres wear out after a certain time. Read our NCERT solutions for Class 8 and relearn the concept of frictional force. 

Understand how friction makes a wet floor slippery by referring to our CBSE Online Class 8 Science NCERT solutions. Skim through the various examples of how friction is an important concept of Science that impacts our daily life. With examples in our CBSE Class 8 Science solutions, you will be able to think of ideas where the concept of friction applies and your conceptual knowledge will improve. This, in turn, will allow you to write about the topic correctly in your exam and will enable you to improve your exam scores too.

 

Chapter 13 - Sound

Understand the various types of sounds and how sound is produced with the help of NCERT solutions for CBSE Class 8 Science Chapter 13 Sound. Learn what kind of sound is considered noise. Also, study sound vibration and sound frequency.

Find accurate NCERT solutions for CBSE Class 8 Chapter Sound at TopperLearning. In this chapter, you will some of the basic concepts related to the study of sound. You will get to understand whether sound travels through solids and liquids. Find out how frequency is related to the pitch of an adult person’s voice and how it compares to a baby’s voice.

Is there a limit to the frequency of sound humans can hear clearly? Are there sounds that are inaudible to human ears? Know about the listening power of humans with Science facts on sound in our CBSE Class 8 Notes for revision with NCERT textbook exercises. Besides, revise the application of the frequency formula and other formulas from this chapter with our step-wise answers.

 

Chapter 14 - Chemical Effects of Electric Current

In our NCERT CBSE Class 8 Science textbook solutions Chapter 14 Chemical Effects of Electric Current, Science experts provide answers on what happens when electric current flows through a chemical solution or water. Also, understand the concept of electroplating while learning about the chemical effects of current by referring to our NCERT solutions for Class 8 Science Chapter 14.

Revise this important chapter with TopperLearning’s CBSE Class 8 Science NCERT solutions. Understand what is electroplating corrosion and how it impacts metal objects. Along with our solutions, there are these concept insights that give you complete clarity of the concepts covered in the textbook solutions. 

Learn why water is a good conductor of electricity and why it is difficult to repair an electrical appliance when it is raining. Our NCERT solutions for Class 8 Science will help you grasp the right answers to important questions concerning real-life applications. With a thorough revision of these chapter concepts, exam questions on the chemical effects of electric current will be comfortable to tackle. To practise questions for the exam, check CBSE Class 8 Science sample papers and solutions.

 

Chapter 15 - Some Natural Phenomena

While revising the NCERT solutions for CBSE Class 8 Science Chapter 15 Some Natural Phenomena, you will find out more about natural phenomena such as earthquakes and lightning. Also, study the concept of charge, positive charge, negative charge, electric discharge, the principle of lightning conductor etc.

With the NCERT solutions for CBSE Class 8 Science by TopperLearning, you will learn how rubbing two objects generates an electric charge. Revise the correct answers to True or False questions with concept insights which give you the additional benefit of better conceptual clarity. When you know the concepts well, you will be able to elaborate on them in your exam with ease.

NCERT solutions for your CBSE Class 8 Science textbook questions not only equips you for your school exam but also improve your general knowledge. As you feel more confident to provide a clear explanation for natural phenomena, you become more confident to participate in Science-based competitions at the school level. The CBSE Class 8 syllabus concepts will also make various advanced concepts in higher classes simpler for you as you move ahead in your academic journey.

 

Chapter 16 - Light

NCERT solutions for CBSE Class 8 Science Chapter 16 Light helps you understand the concept of human vision and visual impairment. In this chapter, you will be introduced to the structure of the eye. Also, learn about the dispersion of light and the laws of reflection.

In school, you will learn more about light as you progress through classes. In the solutions for CBSE Class 8 Science NCERT book, you will get familiar with the basic concepts part of the study of light. Revise about different types of reflection – diffused reflection and regular reflection. The chapter solutions will benefit you immensely during your revision of critical chapter concepts for the exam.

Revisit the important topic of laws of reflection with TopperLearning’s NCERT solutions for CBSE Class 8 Science. Relearn the relationship between the angle of incidence and angle of reflection. The chapter is intriguing with solutions on how to construct a kaleidoscope to answers on how to take care of eyes.

 

Chapter 17 - Stars and the Solar System

The Solar System

·         The Sun and the celestial bodieswhich revolve around it form the Solar System.

The Sun

·         The Sun is the nearest star from us.

·         Its distance from the Earth is about 1.49 × 108km.

The Planets

·         The planets look like stars, but they do not have light of their own. They reflect sunlight which is incident on them.

Other Members of the Solar System

·         Apart from the Sun and the planets, the Solar System also consists of celestial bodies such as asteroids, meteors, comets and artificial satellites.

 

 

Artificial Satellites

·         Artificial satellites are man-made devices which orbit the Earth, Moon and Sun.

·         They gather information about the bodies they orbit.

·         Aryabhatta was the first Indian satellite.

 

·         The other Indian satellites are INSAT, IRS, Kalpana-1 and EDUSAT. 

 

Discover the stars and planets in our solar system through the NCERT solutions for CBSE Class 8 Science Chapter 17 Stars and the Solar System. Study the phases of the moon and get answers on where you will find asteroids. Deepen your knowledge of the night sky with NCERT solutions for Class 8 Science Chapter 17 about constellations, celestial bodies and more.

Ever wondered whether a constellation is a part of the solar system or not? And what is Sirius in the study of the solar system? Answers to these questions and other fascinating facts about the solar system can be found in the NCERT solutions for CBSE Class 8 Science. Learn about planets and asteroids in the solar system with our expert solutions for Fill in blank questions.

Find out whether pole star is a part of the solar system or not with the True or False questions in our CBSE Class 8 Science textbook solutions. Get to know the constellations in the sky by revising the questions and diagrams from this Science chapter. In addition, expand your knowledge about the sun by practising the solved CBSE Class 8 sample paper 2020-21 question at our study portal.

 

Chapter 18 - Pollution of Air and Water

Is clear water pure? What causes air pollution? How can we prevent water pollution? Find answers to all these questions and more in our NCERT solutions for Class 8 Science Chapter 18 Pollution of Air and Water.

How does water get contaminated? Can you contribute to minimising air pollution? The answers to these important questions concerning our environment can be found in NCERT solutions for CBSE Class 8 Science. Also, learn how clean water can reach people with the right measures. Revise how pollutants like sulphur dioxide are released into the atmosphere due to the burning of fuels like coal.

In your CBSE Class 8 syllabus, the chapter on pollution of air and water makes you aware of various environmental issues. You will know how sewage wastes, agricultural chemicals and industrial wastes are impacting the environment. The CBSE Class 8 Science solutions also guide you on the solutions to tackle the pollution caused due to these activities.

 

Why choose TopperLearning?

TopperLearning is among India’s leading online education portals for K-12 study resources. You can find resources like NCERT solutions for Class 8 Science, concept videos, online tests, CBSE sample paper Class 8 and more on our study portal. Get important exam preparation tips and resolve your doubts with our ‘Ask the Expert’ feature. Build your exam confidence with constant practice of solutions from our sample papers and previous years’ papers covering subjects such as Physics, Chemistry, Maths, English, Biology and Hindi.

Utilise the study materials at TopperLearning to excel in the crucial years of Class 8 to Class 12. We also provide high-quality online learning materials for JEE and NEET which are prepared by subject experts for competitive exam preparation. For Class 8, you can revise chapter concepts better with our online study materials and aim for high marks with the necessary exam preparation.

NCERT textbooks are the reference resources prescribed by the CBSE to prepare for CBSE Class 8 Science exams. In Class 8, you will find exercise questions on important topics like gravitational force, chromosomes, cell structure, light, sound, etc. in your textbook. To answer the textbook questions, you may need support mainly for the complex questions. In addition, CBSE Class 8 sample paper 2020-21 is a good resource to practise question types that are likely to appear in your exam.

In our NCERT CBSE Class 8 Science textbook solutions, you will find the ideal answers to textbook exercise questions. These questions are answered by academicians who are subject experts with enormous experience and they are aware of the latest CBSE Class 8 syllabus and marking scheme followed by CBSE. To make it easy for you to navigate through the answers, we have arranged the solutions in a chapter-wise format. All you need to do is select the chapter for quick access to the chapter-specific CBSE Class 8 Science solutions.

 

What are the benefits of using Class 8 Science NCERT Solutions?

Science is one of those subjects which lays the foundation on your journey towards becoming a scientist or innovator in a specific field of Science. NCERT CBSE Class 8 Science textbook solutions are designed to support you with a conceptual understanding of topics in your CBSE Class 8 syllabus. Mugging up answers from your Science textbook might help you to score marks. But to excel in the field of Science, you need to understand the concepts taught in school.

Our NCERT solutions for Class 8 will come in handy for understanding the concepts learned in your Science class. Loaded with concept insights, TopperLearning’s CBSE Class 8 Science solutions empower you with in-depth knowledge of topics from your CBSE Class 8 syllabus. Revise objective type questions like true or false questions or learn to give detailed answers on how to construct a kaleidoscope. All you need is well-written answers easily available at our online education portal.

Whether you intend to revise the topics or find solutions for difficult questions, NCERT CBSE Class 8 Science textbook solutions by our subject experts will support you in your endeavour. These solutions can be viewed as many times as you want 24x7. For more support, you may take a look at other study resources such as CBSE Class 8 Science sample papers and solutions that are available at TopperLearning. We also have a dedicated ‘Ask The Expert’ platform to give you a helping hand if you have questions on topics from your CBSE syllabus for Class 8 Science.

Frequently Asked Questions (FAQs)

1. Are NCERT CBSE Class 8 Science solutions really helpful?

Yes, the NCERT solutions offer in-depth knowledge about the subject in the easiest way possible.

2. Does referring to NCERT CBSE Online Class 8 solutions help in understanding concepts?

Yes, since the questions in the solutions comprise all types of questions, the exposure here is much wider.

3. Where can I find the NCERT CBSE Class 8 Science textbook solutions/notes?

TopperLearning NCERT solutions/notes are divided chapter-wise and can be found easily at TopperLearning.com. Topics from the deleted syllabus of CBSE Class 8 are removed from the portal from time to time to keep the study materials relevant.

4. Will my doubts (if any) regarding the NCERT solutions be answered?

Yes, all doubts regarding NCERT solutions or otherwise will be cleared.

5. Will these notes help me in other important exams?

Yes, these are elaborate solutions that will help you when you prepare for other exams such as the Science Olympiad.

6. Which Class 8 Science chapter covers answers on diffused reflection? 

NCERT CBSE Class 8 Science textbook solutions Science Chapter Light includes answers on diffused reflection and other topics related to the study of light.

7. What are the diagrams that I can revise using NCERT solutions?

Some of the diagrams that you can practise using NCERT free textbook solutions are plant cell, nerve cell, the human eye, etc.

8. What kind of solved questions are present in the CBSE Class 8 Science solutions?

Questions like true or false, crossword, fill in the blanks, distinguish between, long answer questions, etc. are some of the question types that are answered in the textbook solutions.

9. Are there CBSE Online Class 8 solutions available for practising numerical from the textbook?

Yes. TopperLearning’s NCERT solutions provide solutions for numerical in Science along with concept insights. You can also check CBSE Class 8 sample paper 2020-21 and other resources to practise numerically.

10. How will concept insights present in the NCERT CBSE Class 8 Science textbook solutions help me?

Concept insights give you explanations of concepts or justification of certain answers and inform you of important questions from an exam point of view.

11. What are the advantages of using the NCERT Solutions for Class 8 Science?

Class 8th Science NCERT Solutions is intended to assist students in gaining a comprehensive knowledge of topics covered in the CBSE Class 8 Science syllabus. You can mug up the answers in the Science textbook to get good grades. However, understanding the concepts taught in school is essential to excel in Science. Therefore, NCERT Solutions for Class 8 is formulated to strengthen the student's base and provide them complete preparation for the Science examination. Some of the benefits of preparing with the NCERT Solutions are as follows:

  • It assists students in comprehending the ideas taught in Science class.
  • The Solution is jam-packed with concept insights, providing an in-depth knowledge of topics from the CBSE Class 8 syllabus.
  • It also consists of objective type questions for better preparation.
  • Answers to every question are also present to help students learn how to write answers for a specific question and score better than other students.
  • You can look for answers to tricky questions as many times as you want.

All the topics are covered in the Class 8 Science Solutions in detail.

12. Where can I get the chapter wise answers of the NCERT Solutions for Class 8 Science?

On NCERT's official website, you can find chapter-by-chapter answers for Class 8th Science NCERT Solutions. It is available in pdf format. Apart from that, it is also accessible on our official website. Login to our website and register to download the pdf for free.

Students can use these CBSE NCERT Solutions for Class 8 Science 2021-22 to better grasp the concepts presented in the textbook. Solving textbook problems allows students to learn the idea better. Furthermore, the answers in the books assist students in quickly solving the questions.

The NCERT Solutions for Class 8 Science list contains responses to questions from the NCERT Book for Class 8 Science, expressed explicitly and reasonably while adhering to the textbook's objectives. Candidates can use the NCERT Solutions for Class 8 as extra resources and study aids. In addition, students will benefit greatly from learning NCERT textbook practise solutions as part of their exam preparation.

13. Are the NCERT Solutions for Class 8 Science sufficient for the CBSE students?

The main purpose of the Class 8th Science NCERT Solutions is to help CBSE students easily grasp the concepts and get their queries answered post classroom session. Experts have curated the pdf to help students with additional resources to improve their preparation. However, studying only the NCERT Solutions for Class 8 Science is insufficient.

There is no doubt that students can get answers easily, solve exemplary problems, answer MCQs and short questions, study different examples in the pdf and brace their knowledge. However, a textbook is beneficial as an additional resource. You cannot skip the textbook study and focus on the Class 8 Science Solutions to ace the examination. For better marks, you have to study the textbook to prepare for the science subject. Wherever you find a topic in the textbook is unclear to you, you can learn it from the NCERT Solutions to better understand it as it is written in lucid language. But at any cost, you cannot skip the textbook before sitting for the board examinations.