NCERT Solutions for Class 8 Science CBSE
Find the best resources for exam revision in TopperLearning’s Class 8th Science NCERT solutions. 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 Solutions for Class 8 Science, Solutions for Class 8 Science, 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 NCERT Solutions for Class 8 Science, 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 science.
Chapter-wise list of ncert solution for Class 8 Science
- Chapter 1 - Crop Production and Management
- Chapter 2 - Microorganisms: Friend and Foe
- Chapter 3 - Coal and Petroleum
- Chapter 4 - Combustion and Flame
- Chapter 5 - Conservation of Plants and Animals
- Chapter 6 - Reproduction in Animals
- Chapter 7 - Reaching the Age of Adolescence
- Chapter 8 - Force and Pressure
- Chapter 9 - Friction
- Chapter 10 - Sound
- Chapter 11 - Chemical Effects of Electric Current
- Chapter 12 - Some Natural Phenomena
- Chapter 13 - Light
NCERT Solutions for Class 8 Science
NCERT Solutions for Class 8 Science Chapter 1 - Crop Production and Management
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.
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.
· 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.
· 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.
· 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.
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.
NCERT Crop Production and Management Class 8 Videos
NCERT Crop Production and Management Class 8 Revision Notes
NCERT Crop Production and Management Class 8 Most Important Questions
NCERT Crop Production and Management Class 8 MCQ
NCERT Crop Production and Management Class 8 FIB
NCERT Crop Production and Management Class 8 Short Answer Questions
List Of Sub Chapters
Class 8 Science- Agricultural Practices
Class 8 Science- Preparation Of Soil And Sowing Of Seeds
Class 8 Science- Methods Of Irrigation
Class 8 Science- Harvesting And Post Harvesting Practices
Class 8 Science- Animal Husbandry And Food From Animals
NCERT Solutions for Class 8 Science 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
· Organisms too small to be seen with our naked eyes are called microorganisms or microbes.
· They can only be seen using a microscope.
· Uses of Microorganisms
· Increasing soil fertility
· Cleaning the environment
· Retting of fibres
· Tanning of leather
· Production of curd, bread and alcoholic beverages
· Production of antibiotics
· Production of vaccines
· The first antibiotic pencillin was discovered by Alexander Fleming in 1929.
· Fungus Penicillium notatum produces penicillin.
· Some Important Vaccines
· Microbial diseases which can spread from an infected person to a healthy person through air, water, food, physical contact or through vectors are called communicable diseases. Examples: Tuberculosis, chickenpox.
· The insects or other animals which transmit disease causing microorganisms to humans without themselves getting infected are called carriers. Examples: Housefly, mosquito.
· The process of converting nitrogen gas of the atmosphere into compounds of nitrogen which can be used by plants is called nitrogen fixation.
· By nitrogen-fixing bacteria: Ammonia is converted to nitrates by nitrifying bacteria.
· By Rhizobium bacteria: Rhizobia live in the root nodules of leguminous plants. They convert free nitrogen from the atmosphere into soluble nitrates.
· By blue-green algae: They fix nitrogen gas into ammonia, nitrates and nitrites.
· By lightening: During lightning, nitrogen and oxygen from the atmosphere combine to form nitrogen oxides which react with rainwater and form dilute nitric acid.
· Nitric acid reacts with the minerals present in the soil and forms nitrate.
· The process of circulation of nitrogen between the atmosphere, soil, plants and animals is called the nitrogen cycle.
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.
NCERT Micro Organisms Class 8 Videos
NCERT Micro Organisms Class 8 Revision Notes
NCERT Micro Organisms Class 8 Most Important Questions
NCERT Micro Organisms Class 8 MCQ
NCERT Micro Organisms Class 8 FIB
NCERT Micro Organisms Class 8 Short Answer Questions
List Of Sub Chapters
Class 8 Science- Friendly Micro Organisms
Class 8 Science- Harmful Microorganisms
Class 8 Science- More On Harmful Microorganisms
Class 8 Science- Food Preservation
Class 8 Science- Nitrogen Cycle
NCERT Solutions for Class 8 Science Chapter 3 - Synthetic Fibres and Plastics
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.
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 is often regarded as artificial silk.
· It is a man-made fibre prepared from a natural raw material called cellulose by chemical treatment.
· Nylon is the first fully synthetic fibre made by man without using any natural raw materials.
· 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.
· 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.
· 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.
Cross-linked (Thermosetting plastics)
· Plastics are of two types:
· 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
Get solutions for all 12 questions on Page 41 from your NCERT textbook at Topper Learning. Understand what synthetic fibres are and what the features of nylon fibres are. 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.
NCERT Synthetic Fibres and Plastics Class 8 Videos
NCERT Synthetic Fibres and Plastics Class 8 Revision Notes
NCERT Synthetic Fibres and Plastics Class 8 Most Important Questions
NCERT Synthetic Fibres and Plastics Class 8 MCQ
NCERT Synthetic Fibres and Plastics Class 8 FIB
NCERT Synthetic Fibres and Plastics Short Answer Questions
List Of Sub Chapters
Class 8 Science- Synthetic Fibres
NCERT Solutions for Class 8 Science 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
· Metals are malleable.
· Non-metals are not malleable.
· 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.
· Metals are good conductors of heat and electricity.
· Non-metals are poor conductors of heat and electricity.
· Metals are sonorous.
· Non-metals are not sonorous.
· Metals are lustrous or shiny.
· Non-metals are dull and not lustrous.
· Displacement Reactions
· A more re
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.
NCERT Materials Metals and Non Metals Class 8 Videos
NCERT Materials Metals and Non Metals Class 8 Revision Notes
NCERT Materials Metals and Non Metals Class 8 Most Important Questions
NCERT Materials Metals and Non Metals Class 8 MCQ
NCERT Materials Metals and Non Metals Class 8 FIB
NCERT Materials Metals and Non Metals Class 8 Short Answer Questions
List Of Sub Chapters
Class 8 Science- Physical Properties Of Metals And Non Metals
Class 8 Science- Reaction Of Metals With Water, Acids & Bases
Class 8 Science- Reaction Of Metals And Non Metals With Oxygen
Class 8 Science- Displacement Reaction
Class 8 Science- Uses Of Metals And Non Metals
NCERT Solutions for Class 8 Science Chapter 5 - Coal and Petroleum
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 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.
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
ii. Coal Tar
iii. Coal Gas
· 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 Petroleum
Liquid Petroleum Gas
Fuel for home and industry
Motor and aviation fuel, solvent for dry cleaning
Fuel for stoves, lamps and jet aircraft
Fuel for heavy motor vehicles, electric generators
Making ointments, candles, Vaseline
In 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.
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.
NCERT Coal and Petroleum Class 8 Videos
NCERT Coal and Petroleum Class 8 Revision Notes
NCERT Coal and Petroleum Class 8 Most Important Questions
NCERT Coal and Petroleum Class 8 MCQ
NCERT Coal and Petroleum Class 8 FIB
NCERT Coal and Petroleum Class 8 Short Answer Questions
List Of Sub Chapters
Class 8 Science- Coal And Petroleum
Class 8 Science- Petroleum And Natural Gas
NCERT Solutions for Class 8 Science Chapter 6 - Combustion and Flame
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.
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 + Ligh
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
· 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.
· The outermost zone of the flame is called the zone of complete combustion.
· This is the hottest zone of the flame.
· At the bottom of the flame lies a blue zone.
· 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:
o. Solid fuels
o. Liquid fuels
o. Gaseous fuels
· 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.
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.
NCERT Combustion and Flame Class 8 Videos
NCERT Combustion and Flame Class 8 Revision Notes
NCERT Combustion and Flame Class 8 Most Important Questions
NCERT Combustion and Flame Class 8 MCQ
NCERT Combustion and Flame Class 8 FIB
NCERT Combustion and Flame Class 8 Short Answer Questions
List Of Sub Chapters
Class 8 Science- How Do We Control Fire?
Class 8 Science- Burning And Its Problems
NCERT Solutions for Class 8 Science Chapter 7 - Conservation of Plants and Animals
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.
· 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.
Corbett National Park
Sunderbans National Park
Kanha National Park
Bandipur National Park
Ranthambore National Park
Dachigam National Park
Jammu and Kashmir
Gir National Park
Sariska National Park
Kaziranga National Park
Satpura National Park
· 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.
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.
NCERT Conservation of Plants and Animals Class 8 Videos
NCERT Conservation of Plants and Animals Class 8 Revision Notes
NCERT Conservation of Plants and Animals Class 8 Most Important Questions
NCERT Conservation of Plants and Animals Class 8 MCQ
NCERT Conservation of Plants and Animals Class 8 FIB
NCERT Conservation of Plants and Animals Class 8 Short Answer Questions
List Of Sub Chapters
Class 8 Science- Deforestation And Its Causes
NCERT Solutions for Class 8 Science Chapter 8 - Cell – Structure and Functions
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
In this chapter, one will not only learn about what cells are but also the structural organisation of cell.
· Structural Organisation of a Cell
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
· Transparent jelly-like material
· Centre of all metabolic activities
· 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
· 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
· Fluid-filled membrane bound spaces
· Storage of water and other substances, food, pigments and waste products
· 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