Extra Questions for Class 8 Science with Answers

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These Class 8 Science Extra Questions with Answers are the best tool for all the students in revising the concepts during board examinations to score well. In the list below you will find few compilations of CBSE Class 8 Science Important Questions and Answers in pdf format for your better exam preparation.

Extra Important Questions for Class 8 Science with Answers

There is a total of 18 chapters in NCERT Class 8 Science book. In the table below we have provided the CBSE Important questions for class 8 science for all the chapters. We have also included all types of questions, i.e. very short answers, short answer and long answers. These questions will cover all the crucial topic, and entire

Chapter 1 – Crop Production And Management

Agricultural Practices , Basic Practices of crop production , Preparation of soil , Sowing Adding manure and Fertilizers,   Irrigation ,  Protection from weeds , Harvesting , Storage, Food from Animals.


1. To collect various types of seeds.
2. To collect pictures/ draw diagrams of various agricultural tools or machines.
3. To draw pictures of various methods of irrigation


1. Classify crops by cropping patterns such as Kharif and Rabi crops.
2. Show awareness for using resources judiciously like making controlled use of fertilizers and pesticides.
3. Perform activities to investigate the effect of manure and fertilizer on plant growth.
4. Ask questions leading to investigation like why weeding is necessary or why rice is cultivated during rainy season?
5. Apply learning of scientific concepts in daily life, e.g. Increasing of crop production (in kitchen garden).

Chapter 2 – Microorganisms : Friends And Foe

Microorganisms ,  Major groups of microorganisms and their living place  ,  Microorganisms and us Harmful Microorganisms , Food Preservation ,  Nitrogen Fixation ,  Nitrogen cycle


1. To observe drops of pond water, curd, bread mould under microscope.
2. Experiments showing fermentation of dough (increase in volume by yeast) – collect gas in balloon and test the gas by lime water.
3. Pull out a gram/bean plant from the field and to study its root nodules

1. Identify different types of microorganisms (both unicellular and multicellular )
2. Classify useful and harmful microorganisms.
3. Explore the role of microorganisms in life.
4. Asks questions and lead to investigations like how do vegetables or food items get spoiled ?
5. Investigate various diseases caused by microorganisms (symptoms and its prevention).
6. Apply learning of scientific concepts in daily life (what helps in making curd ? how does food go bad ?etc.)
7. Investigate the use of salt and sugar in preserving Pickles and murrabbas.

Chapter 3 – Synthetic Fibers And Plastics

What are synthetic fibers?  Types of synthetic fibers   Characteristics of synthetic fibers. Plastics as a material of choice. Plastics and the environment

1. To collect different kinds of fibers.
2. Testing various materials of fibers for action of water, reaction on heating,
effect of flame, tensile strength and thermal conductivity.
3. To know the differences between thermoplastics and thermosetting plastics by heating.
4. Activity for identifying different materials into biodegradable and non biodegradable.

1. Differentiate materials such as natural and man-made fibers.
2. Identify different types of synthetic fibers on the basis of their chemicals used for their manufacturing.
3. Identify the characteristics of different fibers on the basis of some of the physical properties.
4. Develop awareness about the use and disposal both of the synthetic fibers and plastics.
5. Investigate the reason for using cloth for purpose other than making garments to wear ?

Chapter 4 – Materials : Metals and NonMetals

Physical properties of metals and non-metals  ,  Chemical properties of metals and non-metals Reaction with oxygen, water acids and bases  , Displacement reaction  , Uses of metals and nonmetals.

1. To study the physical properties of metals and non-metals(NCERT Table 4.1 & 4.2)
2. To study the nature of oxides of metals and nonmetals.
3. To study displacement reaction.Reaction of metals and non-metals with acids (table 4.5).

1. Identify and classify materials as metal and non- metals on the basis of their physical and chemical properties.
2. Write word equations for chemical reactions e.g. Reactions of metals and Non-metals with air,water,acids and bases
3. Investigate the cause of any query like why are ringing bells not made of wood?
Or why metal oxides are basic whereas non-metals are acidic in nature?
4. Investigate physical and chemical properties of materials by various activities .e.g. can a wire be drawn out of wood ? do copper and aluminium also rust like iron ?
5. Differentiate between metals and nonmetals by observing physical and chemical properties .
6. Provide justification in support of evidences like metals are sonorous, lustrous, malleable and ductile.
7. Apply learning of scientific concepts in day to day life using appropriate metals and non-metals for various
purposes e.g.explain  that metals are used for making aeroplanes, boilers, heaters etc. while nonmetals are used as fertilizers etc

Chapter 5 – Coal And Petroleum

Inexhaustible natural , resources and Exhaustible , natural resource , Coal
Petroleum , Natural gas , Some natural resources are limited .

1. Listing of materials into natural and man-made fuels which are required for our basic needs (activity 5.1)
2. With the help of activity 5.2 Find out how exhaustible resources are reducing in amount.

1. Classify Exhaustible and inexhaustible natural-resources.
2. Identify the fossil fuel.
3. Understand the process of refining petroleum.
4. Develop awareness for the use of exhaustible fuels judiciously.
5. Differentiate between biodegradable and non-biodegradable resources.

Chapter 6 – Combustion And Flame

Combustion , How do we control fire? , Types of combustion , Flame and structure of flame,Fuel , Fuel efficiency.

1.To study the parts of a flame.
2. To prepare a model of fire extinguisher.
3. Slogan/ poster competition on “Burning of fuels leads to harmful by products”
4. Experiment showing that fuels release heat on burning ( candle, kerosene and LPG) [this expt.should necessarily be done by  THE TEACHER]

1. Conduct simple investigation to seek answer to query like – What are the
conditions required for combustion?
2. Explain that all the fuels release heat on burning.
3. Explain the physical process in the formation of Flame with the help of a labelled diagram.
4. Investigate and analyse “what happens when kerosene and natural gas are burnt?”
5. Understand the precautions to be taken while using LPG.
6. Displays sense of interest in science by constructing a model of Fire extinguisher and explain its

Chapter 7 – Cell – Structure And Function

Discovery of the cell , The cell , Organisms show Variety in Cell Number ,Shape and Size Cell structure and function. , Parts of the Cell , Comparison of Plant and animal cell.

1. To understand working of a microscope.
2. Study of unicellular organisms. (Permanent slide) .
3. To prepare temporary mounts of onion peel and cheek cells (inner part of mouth)

1. Identify the Cell Structure and explain it with the help of a labelled diagram.
2. Classify organisms into unicellular and multicellular based on the number of cells .
3. Differentiate between plant and animal cells.
4. Identify onion peel and human cheek cells and also learn the use of stain to
observe cell organelles- nucleus, vacuole, chloroplast cell membrane and cell wall.

Chapter 8 – Reproduction In Animals

Modes of reproduction , Sexual Reproduction (male reproductive organs, female reproductive
organs and fertilization, Development of embryo, viviparous and oviparous animals. Young to adults ) Asexual
reproduction by budding and binary fission

1.To study the various modes of asexual reproduction in Hydra and Amoeba (with the help of permanent slides)
2. To study the life cycle of frog/mosquito with the help of a chart/model.

1. Classify organism based on asexual and sexual mode of reproduction.
2. Explain the processes of asexual reproduction like binary fission and budding .
3. Explain process of Reproduction in human and animals.
4. Differentiate between external and internal fertilization.
5. Identify between viviparous and oviparous animals on the basis of egg laying or baby birth.
6. Explain with the help of self drawn labeled diagram/flow chart of human reproductive organ.
7. Investigate to get the answers of the quarries e.g. Do all animals give birth to young ones.

Chapter 9 – Forces And Pressure

Force – a push or a pull ,  Forces are due to an interaction ,  Exploring forces.
A force can change the state of motion ,  Force can change the shape of an object ,  direction and speed of an object , Contact forces , Non- contact forces ,  Pressure ,  Pressure exerted by liquids and gases. Atmospheric pressure

1. To study various types of forces and their impacts.
2. To study the relation between force and motion in daily life situations .
3. Demonstrating change in speed of a moving object in direction of motion and shape by applying force .
4. Measuring the weight of an object , as a force (pull) by the earth using a spring balance
5. To observe the forces of attraction and repulsion between two types of a bar magnet.
6. To study the dependence of pressure on area.
7. To study increase in pressure exerted by the liquids at the greater depth

1. Identify various types of forces by giving examples from daily life.
2. Understand the reason how force arises due to interaction between two objects .
3. Investigate the effect of force on speed and direction of moving objects .
4. Differentiate between contact and non contact forces.
5. Identify and demonstrate the relation between force, area and pressure .
6. Conduct simple investigation to seek answer to queries e.g. Do liquids exert
pressure at same depth ?
7. Investigate to find the reason like what happens when we push or pull anything ? or why needles are made pointed ?

Chapter 10 – Friction

Force of friction, factors affecting friction, Friction: a necessary evil, increasing and decreasing friction, Wheels reduce friction, Fluid friction

1 Demonstrate that Force of friction depends on nature of surface in contact.
2. Demonstrate Wear and tear of moving objects by rubbing.
3. To collect and display pictures of some sports and actions where friction is necessary or evils.
4. Discussion on the methods of reducing friction and ways of increasing friction

1. Demonstrate friction between rough and smooth surfaces.
2. Understand the cause of wear and tear of moving objects .
3. Differentiate among static ,sliding and rolling friction .
4. Apply scientific learning in daily life like increasing/ reducing friction
(soles of the shoes are grooved for better grip ?).

Chapter 11 – Chemical Effects of Electric Current

Do liquids conduct electricity? , Chemical effects of electric currents.
Electroplating and its uses, good conductors and bad conductors of electricity.

1. To test the conduction of electricity through various fruits, vegetables, wood piece, metal piece and display your result in tabular form (Good Conductor/Bad Conductor).
2. To study the phenomenon of electroplating by simple circuit.
3. To test that water conducts electricity depending on the presence / absence of salt in it. ( repeat the test by using other liquids like glucose water or any other of your choice )
1. Identify liquids on the basis of conductivity as electrical conductors or insulators.
2. Conduct simple investigation to seek the answer for queries like why acids,bases and salts conduct electricity? and why do we get shock when we touch electric appliance with wet hands?
3. Explain the process of Chemical effects of electric current .
4. Apply learning of scientific concepts in day to day life of depositing a layer of any desired metal on another materials by electroplating .
5. Use of electroplating in daily life .

Chapter 12 – Light

What makes things visible , Laws of reflection, Regular and diffused reflection multiple reflection Reflected light can be reflected again . Multiple Images Sunlight-,white or coloured, What is inside Our Eyes ?(human eye-structure and function) Care of the Eyes Visually challenged persons can read and write. What is the Braille system?

1. Exploring laws of reflection using ray source and mirror.
2. Locating the reflected image using glass sheet and candle .
3. Observing an object through a straight and bent tube.
4. Observation of multiple images formed by mirrors placed at angles to each other
5. Observation of spectrum on white sheet of paper or wall using a plane mirror
inclined on water surface at an angle of 450

1. To differentiate between regular and irregular reflection.
2. Identify the Characteristics of image formed by plane mirror .
3. Explain the process for the formation of multiple images.
4. Explain the structure of eye with the help of self drawn labeled diagram.
5. Understand the reflection of light from an object to the eye.
6. Conduct simple investigations to seek answer to queries that angle of incidence is equal to angle of reflection and Incident ray, the normal at the point of incidence and reflected ray all lie in the same plane.

Chapter 13 – Pollution of Air And Water

Air pollution, how does air get polluted? Case study :Taj Mahal, what can be done to reduce global warming? Ozone depletion. Water pollution,
how does water get polluted? What can be done to reduce water pollution?

1. Preparing a list about diseases caused by various types of pollutants.
2. To make project/ poster/ slogan writing on green house effect/ global
warming/ ozone depletion.

1. Relates process and phenomenon with causes e.g. Smog formation due to the
presence of pollutants in air, deterioration of monuments with acid rains etc.
2. Applies learning of scientific concepts in day to day life e.g.Purifying water.
3. Show awareness to protect environment using resources judiciously .
4. Suggesting ways to cope with environmental problems etc
5. Like – Global warming due to increase in the greenhouse gases

Reference : Edudel CBSE Website

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