CLASS - 6 SCIENCE CHAPTER - 16GARBAGE IN,GARBAGE OUTQUESTIONS AND ANSWERS

Question no. 1

(a) Which kinds of garbage is not converted into compost by the red worms ?

(b) Have you seen any other organism besides red worms,in your pit? If yes,try to find out their names. Draw pictures of these.

Answer no. 1

(a) Plastic bags and articles,tin,glass,aluminium foils are not converted in compost by red worms.
(b) Earthworms, small insects like ant,millipedes are found in pits.

Question no. 2

Discuss:
(a) Is garbage disposal the responsibility only of the government?
(b) Is it possible to reduce the problems relating to disposal of garbage?

Answer no. 2  

(a) No,garbage disposal is not responsibility for the government only,but every citizen are responsible for it. Garbage is segregated in wet and dry waste,recycle non biodegradable and it should be disposed accordingly. House and surroundings should be cleaned. There should be no accumulation of garbage in home or street it should be properly disposed in garbage pit.

(b) Yes,it is possible to reduce the problems of garbage by scientific disposal of garbage,it can be done by segregating the waste in wet and dry garbage,recycle and it should be disposed properly.

Question no. 3

(a) What do you do with the left over food at home?
(b) If you and your friends are given the choice of eating in a plastic plate or a banana leaf platter at a party,which one would you prefer and why?

Answer no. 3

(a) Left over food is preserved in refrigerator and it is used before they get spoiled.
(b) I choose banana leaf because it environmental friendly and easy to dispose.

Question no. 4

(a) Collect pieces of different kinds of paper. Find out which of these can be recycled.
(b) With the help of a lens look at the pieces of paper you collected fro the above question. Do you see any difference in the material of recycled paper and a new sheet of paper?

Answer no. 4

(a) All kinds of paper can be recycled except plastic paper.
(b) Recycled paper is thick compared to non recycled paper.

Question no. 5

(a) Collect different kinds of packaging material. What was the purpose for which each one was used? Discuss in groups.
(b) Give an example in which packaging could have been reduced?
(c) Write a story on how packaging increases the amount of garbage?

Answer no. 5

(a) Different kind of packaging materials are used to keep the items safe inside the packing. Some packing materials which are commonly used are -

Cardboard packing material used for - Shoe,soap,bulb and other boxes
Plastic bags used for - Toys covers,sarees bag,shopping bags etc.
Wooden boxes used for - Fruit basket and boxes for hardware and other delicate items.
Jute bags used for - school bags, shopping bag, vegetable bags etc.

(b)  In so many cases  unnecessary packing is done than the requirement. Some materials are packed in two to three tier packing it should be avoided to reduce the packing. If the packing material is not delicate then the packing material should be removed and delivered to customers. This removed packing material is to be sent to concern company for reuse that packing material. To adopting this technique we can reduce the use of plastic as well garbage.

(c) Packing materials are basically used to protect the items for tempering. Sometime it is used to beautify the boxes and make them look attractive. A large volume of packing material goes waste and it is thrown into dustbin. It unnecessarily increases the amount of garbage. It also increases the cost of the  the product.
Except the delicate items. The other items while delivering to customer, the package should be removed and it sent back to the company for another packing. Hence we can avoid the increasing amount of garbage due to packing material.

Question no. 6

Do you think it is better to use compost instead of chemical fertilizers? Why?

Answer no. 6

Yes, it is better to use compost instead of chemical fertilizers for the following reason - 

1 - compost is easily prepared.
2 - compost is environmental friendly because it does not cause any health issue in humans and animals.
3 - compost does not cause pollution.
4 - compost increases soil fertility.
5 - compost is biodegradable.

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCE 

CHAPTER - 15

AIR AROUND US

QUESTIONS AND ANSWERS

Question no. 1

What is the composition of air?

Answer no. 1

The air is a composition of oxygen,nitrogen,carbon dioxide,water vapour, dust and smoke.

Question no. 2

Which gas in the atmosphere is essential for respiration?

Answer no. 2

Oxygen present in the atmosphere is essential for respiration?

Question no. 3

How will you prove that air supports burning?

Answer no. 3

Take a candle and place it in a tub. Light the candle and fill the tub with water. Now cover the candle with an inverted glass. It is observed that candle blows out after burning some time and the water level inside the inverted glass rises to some extent.

The component part of air (i.e. oxygen) inside the glass is used up in burning. After blows out candle water occupies that space. It shows that air support burning.

Question no. 4

How will you show that air is dissolved in water?

Answer no. 4

Take a glass beaker and fill it with water. Boil it. Before it start boiling bubbles appears in the bottom,these bubbles are due to air present in water. This experiment proves that air present in the water.

Question no. 5

Why does a lump of cotton wool shrink in water?

Answer no. 5

The lump of cotton wool shrink in water because the air inside the cotton lumps are replaced by water which make the layer stick together and it shrink.

Question no. 6

6. The layer of air around the earth is known as __________________.

Answer no. 6

Atmosphere

Question no. 7

The component of air used by green plants to make their food,is ____________________.

Answer no. 7

Carbon dioxide

Question no. 8

List five activities that are possible due to the presence of air.

Answer no. 8

Activities which are possible due to air are -

1. Respiration
2. Transpiration
3. Photosynthesis
4. Cloud formation 
5. Winnowing

Question no. 9

How do plants and animals help each other in the exchange of gases in the atmosphere?

Answer no. 9

Plants take carbon dioxide and give out oxygen. This oxygen is used by animals for respiration and expel out carbon dioxides. This carbon dioxides is used by plant to prepare food. This cycle continues so plant and animals help each other in exchange of gases in the atmosphere.

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCE CHAPTER - 14 WATERQUESTIONS AND ANSWER

Question no. 1

Fill up the blanks in the following:

(a) The process of changing of water into its vapour is called ______________________.
(b) The process of changing water vapour into water is called ______________________.
(c) no rainfall for a year or more may lead to ________________ in that region.
(d) Excessive rain may cause ______________.

Answer no. 1

(a) evaporation
(b) condensation
(c) drought
(d) floods

Question no. 2

State for each of the following whether it is due to evaporation or condensation:

(a) water drops appear on the outer surface of a glass containing cold water.
(b) steam rising from wet clothes while they are ironed.
(c) Fog appearing on a cold winter morning.
(d) blackboard dries up after wiping it.
(e) steam rising from hot girdle when water sprinkled on it.

Answer no. 2

(a) condensation
(b) evaporation
(c) condensation
(d) evaporation
(e) evaporation

Question no. 3

Which of the following statements are true?

(a) water vapour is present in air only during the monsoon.
(b) water evaporates into air from oceans, rivers and lakes but not from the soil.
(c) the process of water changing into its vapour, is called evaporation.
(d) the evaporation of water takes place only in sunlight.
(e) water vapour condenses to form tiny droplets of water in the upper layer of air where it is cooler.

Answer no. 3

(a) False
(b) False
(c) True
(d) False
(e) True

Question no. 4

Suppose you want to die your school uniform quickly. Would spreading it near an anghiti  or heater help? If yes, how?

Answer no. 4

 Yes. If school uniform would spread near anghiti or heater due to the rate of evaporation will be faster and uniform will quickly dried up.

Question no. 5

Take out a cooled bottle of water from refrigerator and keep it on a table. After sometime you notice a Puddle of water around it. Why?

Answer no. 5

It happens because the surface of the air around the bottle cool down and air condensed around the bottle.

Question no. 6

To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

Answer no. 6

Air coming out from mouth is warm compare to air around the spectacles. When it comes in contact to the spectacles air cool down on the surface of glass glass becomes wet.

Question no. 7

How are clouds formed?

Answer no. 7

The process of condensation plays an important role in formation of Clouds. As we go higher from the surface of the Earth, it gets cooler. When the air moves up again it gets cooler and cooler. At sufficient Heights the air becomes so cool that the water vapour present in it condensed to form a drop of water call droplets. This tiny drops remains floating in air and appears as a cloud.

Question no. 8

When does a drought occur?

Answer no. 8

If it does not rain in a region for a year or more the soil continues to lose water by evaporation and transpiration. Since it is not be brought  back by rain, the soil becomes dry. The level of water in ponds and Wells of that region goes down and some of them even dry up. This may lead to drought.

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCE CHAPTER - 13 FUN WITH MAGNETS  QUESTIONS AND ANSWERS

Question no. 1

Fill in the blanks in the following.

(i) Artificial magnets are made in different shapes such as __________________,____________________ and __________________.
(ii) The materials which are attracted towards a magnet are called _______________________.
(iii) Paper is not a ___________________ material.
(iv) In olden days, sailors used to find direction by suspending a piece of ______________________.
(v) A magnet always has ____ poles.

Answer no. 1

(i) Bar magnet,horse shoe and cylindrical.
(ii) Magnetic
(iii) Magnetic
(iv) Magnet
(v) Two

Question no. 2

State whether the following statements are true or false:

(i) a cylindrical magnet has only one pole.
(ii) artificial magnet were discovered in Greece.
(iii) similar poles of a magnet repel each other.
(iv) maximum iron filling stick in the middle of bar magnet when it is brought near them.
(v) bar magnet always point towards north - south direction.
(vi) compass can be used to find east - west direction at any place.
(vii) rubber is a magnetic material.

Answer no. 2

(i) False
(ii) False
(iii) True 
(iv) False
(v) True
(vi) True
(vii) False

Question no. 3

It was observed that a pencil sharpener get attracted by both the poles of a magnet although its body is made of plastic. Name a material that might have been used to make some part of it.

Answer no. 3

Some portion of sharpener is made of iron because of this it is attracted by both the poles of magnet.

Question no. 4

4.Column I shows different positions in which one pole of a magnet is placed near
that of the other. Column II indicates the resulting action between them for
each situation. Fill in the blanks.

Answer no. 4

Column I                                    Column II

N - N                                             Repulsion
N - S                                              Attraction
S - N                                              Attraction
S - S                                               Repulsion

Question no. 5

Write any two properties of a magnet.

Answer no. 5

1 - magnet direct the side in North and South direction.
2 - it attracts the objects made of iron, nickle, cobalt.

Question no. 6

Where are poles of a bar magnet located?

Answer no. 6

At the end of the bar magnet.

Question no. 7

A bar magnet has no markings to indicate its poles. How would you find out
near which end is its north pole located?

Answer no. 7

Bar magnet is hanged in the air. The end of the magnet that points towards north is called north pole and the other end point in South is called South Pole.

Question no. 8

You are given an iron strip. How will you make it into a magnet?

Answer no. 8

Place the iron strip on table. Take a bar magnet and place one of its poles near one edge of iron. Without lifting the bar magnet, move it along the length of iron strip till you reached other and of iron strip. Now lift the magnet and bring the pole (the same pole you started with) to the same point of iron strip from where you began. Move the magnet again along the iron bar in the same direction as it done before. This process is repeated 30-40 time. After this process the iron strip will have the property of magnet.

Question no. 9

How is a compass used to find directions?

Answer no. 9

The needle of compass is made of magnet which rotate freely. According to the property of magnet it rest in North and South side. Direction is traced out.

Question no. 10

A magnet was brought from different directions towards a toy boat that has been floating in water in a tub. Affect observed in each case stated in column I. Possible reasons for the observed affects are mentioned in column II. Mat the statement given in column I with those in column II.

Answer no. 10

Column I                            Column II

1. Boat gets attracted    1. Boat is made 
   towards the magnet      of magnet material.

2. Boat is not affected  2. Boat is made up 
    by the magnet.                non magnetic material.

3. Boat moves towards  3. Boat is fitted with a magnet
     the magnet if the            with south pole towards
    north pole of the            its head.
     magnet is brought
  near its head.

4. Boat moves away        4. Boat is fitted  with a magnet 
    from the magnet              with north pole towards
    when north pole                its head.
     is brought near 
     its head.

5.  Boat floats without    5. Boat has a small magnet 
      changing its                     fixed along its length.
      direction.

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?


     

CLASS - 6 SCIENCE CHAPTER - 11LIGHT,SHADOWS AND REFLECTIONSQUESTIONS AND ANSWERS

Question no. 1

Rearrange the boxes given below to make a sentence that help us understand Opaque objects.

OWS ,  AKE , OPAQ , UE O , BJECT , T SM , SHAD

Answer no. 1

OPAQ UE O BJEC TS M AKE SHAD OWS 

 OPAQUE OBJECTS MAKES SHADOW

Question no. 2

Classify the object or materials given below as opaque, transparent or translucent and Luminous or non luminous:

Answer no. 2

Opaque materials - a piece of Rock, a sheet of aluminium, CD, smoke, iron, an umbrella, a wall.

Transparent materials - air, water, a sheet of plane, glass.

Translucent materials - A sheet of polythene, fog, a sheet of cellophane.

Luminous material - a lighting fluorescent tube, the flame of a gas burner, a lighted torch, Firefly stove, Sun, moon.

Question no. 3

Can you think of creating a shape that would give a circular Shadow if held in one way and a rectangular Shadow if held in another way?

Answer no. 3

Yes it is possible that creating a shape that would give a circular Shadow if held in one way and a rectangular Shadow if held in another way.

Question no. 4

In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?

Answer no. 4

No, in a dark room, mirror reflection of image will not be shown as light will not fall on the mirror to reflect the image.

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCE CHAPTER - 12ELECTRICITY AND CIRCUITSQUESTIONS AND ANSWERS

Question no. 1

Fill in the blanks:
(a) a device that is used to break an electric circuit is called __________________.
(b) an electric cell has _________________ terminals.

Answer no. 1

(a) switch 
(b) two

Question no. 2

Mark true or false for following statements:

(a) electric current can flow through metals.
(b) instead of metals wires, a jute string can be used to make circuit.
(c) electric current can pass through a sheet of thermocol.

Answer no. 2

(a) True
(b) False 
(c) False

Question no. 3

Explain why the bulb would not glow in the arrangement shown in fig. 12.13.

Answer no. 3

Bulb would not glow in the arrangement because circuit is not completed due to presence of insulator (hand of screwdriver is made of wood) in the circuit.

Question no. 4

Complete the drawing shown in fig 12.14 to indicate where the free end of the two wires should be joined to make the bulb glow. 

Answer no. 4

Question no. 5

What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.

Answer no. 5

Purpose of electric switch is to complete or break the circuit. The some electrical gadgets which has switches built into them are television, micro oven, Electric cooker, fan etc.

Question no. 6

Would the bulb glow after completing the circuit shown in fig. 12. 14  if instead of safety pin we use an eraser?

Answer no. 6

No, the bulb will not glow because circuit will not complete. Eraser is and insulator.

Question no. 7

Would the bulb glow in the circuit shown in fig.  12.15?

Answer no. 7

No, the bulb will not glow.

Question no. 8

Using the conductor tester of an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.

Answer no. 8

The object is a conductor because circuit is completed and bulb is glowing.

Question no. 9

Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.

Answer no. 9

Rubber gloves are insulator. Electricity does not pass through it. Hence it protect from electric shock.

Question no. 10

The handles of the tools like screwdrivers and pliers used by electrician for repair work usually have plastic or rubber covers on them. Can you explain why?

Answer no. 10

Handles of screwdriver and pliers used by electrician is made of plastic or rubber because these are acts as a  insulator. Electricity does not pass through it. Hence it protect from electric shock. 

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCE CHAPTER - 10 MOTION AND MEASUREMENT OF DISTANCESQUESTIONS AND ANSWERS

Question no. 1

Give two examples each, of Modes of transport used on land, water and air.

Answer no. 1

Mode of transport on land - Train,bus
Mode of transport on water - Ship,boat
Mode of transport in air - Helicopter,aeroplane

Question no. 2

Fill in the blanks:

(i) One metre is __________ cm.
(ii) Five kilometre is __________ m.
(iii) Motion of a child on a swing is ____________________.
(iv) Motion of the needle of a sewing machine is _______________.
(v) Motion of wheel of a bicycle is ______________________.

Answer no. 2

(i) 100
(ii) 5000
(iii) Periodic
(iv) Periodic
(v) Circular

Question no. 3

Why can a pace or a footstep not be used as a standard unit of length?

Answer no. 3

Pace or a footstep cannot be used as a standard unit of length because it differs from person to person.

Question no. 4

Arrange the following lengths in their increasing magnitude:
1 metre, 1 centimetre, 1 kilometre, 1 millimetre.

Answer no. 4

1 millimetre, 1 centimetre,1 metre,1 kilometre.

Question no. 5

The height of a person is 1.65. Express it into centimetre and millimetre.

Answer no. 5

Since 1 metre = 100
so 1.65 metre = 1.65x 100
                              = 165 centimetre

Question no. 6

The distance between Radha home and her school is 3250 metre. Express this distance into kilometre.

Answer no. 6

Since 1 km = 1000 metre
                                         
So 3250 metre = 3250 divided by 1000 = 3.25 kilometre

Question no. 7

While measuring the length of a knitting needle, the reading on the scale at one end is 3.0 and at the other end is 33.1. What is the length of the needle?

Answer no. 7 

Starting point of length = 3.0 centimetre
End point of length = 33.1 centimetre

So, length of needle = 33.1 - 3 = 30.1 centimetre

Question no. 8

Write the similarities and differences between the motion of bicycle and a ceiling fan that has been switched on.

Answer no. 8

Similarities - both show circular motion
Differences - bicycle wheels move in rectilinear motion while fan does not move in rectilinear motion.

Question no. 9

Why could you not use an elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape?

Answer no. 9

An elastic measuring tape will not show accurate measurement as its length may very because of having elastic property. When we take measurement with elastic tape, we have to tell whether the tape was stretch or not. If yes then how much it was stretched. Hence it is very difficult to tell the measurement taken from elastic tape is accurate.

Question no. 10

Give two examples of periodic motion.

Answer no. 10

1. Needle of a sewing machine.
2. Pendulum

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCE CHAPTER - 9 THE LIVING ORGANISM AND THEIR SURROUNDINGS QUESTIONS AND ANSWERS

Question no. 1

What is a habitat?

Answer no. 1

The surroundings where organisms live is called a habitat. The organism depends for their food water their shelter and the other requirement on their habitat. In other word Habitat means dwelling place  (a home). Several kinds of plants and animals me share the same habitat.

Question no. 2

How are cactus adapted to survive in a desert?

Answer no. 2

The cactus has the following adaption to survive in a desert.
1 - It has long roots which go deep inside the soil for absorbing water.
2 - Its leaves are present in the form of spines to prevent water loss through the transpiration.
3 - Its stem is covered with a thick waxy layer to retain water.

Question no. 3

Fill up the blanks

(a) The presence of specific features, which enable a plant or an animal to live
in a particular habitat, is called ___________________.
(b) The habitats of the plants and animals that live on land are called ___________________.
habitat.
(c) The habitats of plants and animals that live in water are called ____________________
habitat.
(d) Soil, water and air are the ———— factors of a habitat.
(e) Changes in our surroundings that make us respond to them, are
called ___________________.

Answer no. 3

(a) Adaptation 
(b) Terrestrial
(c) Aquatic
(d) Abiotic
(e) Stimuli

Question no. 4

Which of the things in the following list are nonliving?
Plough, Mushroom, Sewing machine, Radio, Boat, Water hyacinth, Earthworm.

Answer no. 4

Non living things - 
Plough,sewing machine, Radio and boat

Question no. 5

Give an example of a non-living thing, which shows any two characteristics of
living things.

Answer no. 5

Example - car
-  It can move like living beings
-  It need oxygen

Question no. 6

Which of the non - living things listed below, were once part of a living thing?
Butter, Leather, Soil, Wool, Electric bulb, Cooking oil, Salt, Apple, Rubber.

Answer no. 6

Butter,leather,wool,cooking oil. Apple and rubber were once part of a living things. Butter, leather and wool animal product, while Apple, cooking oil and Rubber are plant product.

Question no. 7

List the common characteristics of the living things.

Answer no. 7

The common characteristics of living things are as follows.
1 - Food intake
2 - Respiration
3 - response to stimuli
4 - movement
5 - excretion
6 - reproduction

Question no. 8

Explain, why speed is important for survival in the grasslands for animals
that live there. (Hint: There are few trees or places for animals to hide in
grasslands habitats.)

Answer no. 8

Speed is important for survival in the grasslands for animals to save themselves from their predator. For example Tiger eats deer so to survive dear has to run faster than the tiger.

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCE 

CHAPTER - 8

BODY MOVEMENTS

QUESTION AND ANSWERS

Question no. 1

Fill in the blanks:


(a) Joints of the bones help in the ——————— of the body.
(b) A combination of bones and cartilages forms the _______ of the body.
(c) The bones at the elbow are joined by a ______________________ joint.
(d) The contraction of the _____________ pulls the bones during movement.

Answer no. 1

(a) Movement
(b) Skeleton
(c) Hinge
(d) Muscles

Question no. 2

Indicate true (T) and false (F) among the following sentences.
(a) The movement and locomotion of all animals is exactly the same. 
(b) The cartilages are harder than bones. 
(c) The finger bones do not have joints. 
(d) The fore arm has two bones. 
(e) Cockroaches have an outer skeleton.

Answer no. 2

(a) False
(b) False
(c) False
(d) True
(e) True

Question no. 3

3.Match the items in Column I with one or more items of Column II.

 Answer no. 3

 Column I                                   Column II

 Upper jaw                                is an immovable joint  
 Ribs                                            protect the heart
 Snail                                          Shows very slow movement
 Cockroach                                has an outer skeleton

Question no. 4

Answer the following:
(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?

Answer no. 4

(a) Ball socket joint
 The rounded end of one bone fits into the cavity i.e hollow space of the another bone. Such a joint allows Movement in all directions which is called ball and socket joint.
(b) lower jaw
(c) Elbow has a Hinge Joint. Because of hinge joint it cannot move backwards.

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCE

CHAPTER - 7

GETTING TO KNOW PLANTS 

QUESTIONS AND ANSWERS

Question no. 1

Correct the following statements and rewrite them in your notebook.

(a) stem absorb water and Minerals from the soil.
(b) leaves hold the plant upright.
(c) roots conduct water to the leaves.
(d) the number of petals and sepals of a flower is always equal.
(e) if the sepals of a flower are joined together, it petals are also join together.
(f)  if the Petals of a flower are joined together, then the pistil is joined to the petal.

Answer no. 1

(a) roots absorb water and Minerals from the soil.
(b) stems hold the plant upright.
(c) stems conduct water to the leaves.
(d) the number of petals and stamens in a flower may not be always equal.
(e) if the petals of a flower are joined together, its petals are separate.
(f) if the petals of a flower are joined together, then the pistil may or may not be joined to the petal.

Question no. 3

Can you find a plant in your house or in your neighborhood, which has a long but a weak stem? Write its name. In which category would you classify it?  

Answer no. 3

Yes pumpkin plant needs support. It is a climber.

Question no. 4

What is the function of a stem in a plant?

Answer no. 4

Function of a stem

1. Stem holds the plant upright.
2. Stems conduct water to the leaves.
3. Stems conduct food from leaves to other parts of the plant.

Question no. 5

Which of the following leaves have reticulate venation?

Wheat, Tulsi, Maze, grass, coriander (dhania), China rose

Answer no. 5

Tulsi, China rose and coriander have reticulate venation.

Question no. 6

If a plant has fibrous root, what type of venation do its leaves likely to have?

Answer no. 6

If a plant has fibrous root, its leaves will have parallel venation.

Question no. 7

If a plant has leaves with reticulate venation, what kind of roots will it have?

Answer no. 7

If a plant has leaves with reticulate venation, it will have tap root.

Question no. 8

Is it possible for you to find out whether a plant has taproot or fibrous roots by looking at the impression of it leave on a sheet of paper?

Answer no. 8

Yes it is possible to find whether a plant has taproot or fibrous roots by looking at the impression of its leaves on a sheet of paper.

Question no. 9

Write the names of the part of a flower.

Answer no. 9

Sepals,petals,stigma,pistil,anther,filament

Question no. 10

Which of the following plants have you seen? Of those that you have seen, which one have flowers?

Answer no. 10

Tomato,Chilli, Tulsi, mango, pomegranate, lemon, Jamun, guava,papaya, banana.

Question no. 11

Name the parts of the plant which produce its food. Name this process.

Answer no. 11

Leaves produce food through the process of photosynthesis.

Question no. 12

In which part of flower, you are likely to find the ovary ?

Answer no. 12

Ovary found in lowermost and swollen parts of the pistil.

Question no. 13

Name two flowers, each with joined and separated sepals.

Answer no. 13

Plants with joined sepals - Rose, lotus
Plants with separate sepals - mustard flower, China rose

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCECHAPTER - 5 SEPARATION OF SUBSTANCESQUESTIONS AND ANSWERS

Question no. 1

Why do we need to separate different components of mixture? Give two examples.

Answer No. 1

When two or more substances are are mixed together they form a mixture. Components of mixture should be separated to remove non useful components coma to remove impurities are harmful components.

Examples - 1 - to separate stones from rice.
                      2- churning milk to obtain butter.

Question no. 2

What is is winnowing ? Where is it used?

Answer no. 2

Winnowing is a method of separating of components of a mixture. Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air.

Question no. 3 

 3.How will you separate husk or dirt particles from a given sample of pulses before
cooking.

Answer no. 3

Standard particles are separated from pulses by the method of hand picking.

Question no. 4

4.What is sieving? Where is it used?

Answer no. 4

Sieving is a method in which particles pass through the holes of the sieve while bigger impurities remains on the sieve. It is used in flour mill, to remove impurities like husk and stones from wheat.

Question no. 5

5.How will you separate sand and water from their mixture?

Answer no. 5

Sand and water separated by the process of sedimentation. In this method mixture of sand and water is allowed to stand for some time. The sand is settled down in the bottom. Water is poured slowly into another container.  Hence water and sand is separated.

Question no. 6

6.Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?

Answer no. 6

Yes it is possible to separate sugar mixed with wheat flour by the following method.

1 - mixing of sugar and wheat flour in water.
2 - solution should be stir to allow sugar to dissolve.
3 - now solution is filtered.
4 - does sugar solution will be separated and residue will be wheat flour.

Question no. 7

7.How would you obtain clear water from a sample of muddy water?

Answer no. 7

Following steps should be taken to obtain clear water from muddy water.

(1) Leave the muddy water for a certain period of time.
(2) Muds get settle down in bottom and a layer of clean water is form between clear water and settled mud.
(3) slowly pour clear water to another container.

Question no. 8

Fill up the blanks

(a) The method of separating seed of paddy from its stalk is called ____________________.
(b) When milk,cooled after boiling,is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of ______________.
(c) Salt is obtained from seawater by the process of __________________.
(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called___________________.

Answer no. 8

(a) Threshing
(b) Filtration
(c) Evaporation 
(c) Decantation

Question no. 9

True or false?

(a) A mixture of milk and water can be separated by filtration.
(b) A mixture of powdered salt and sugar can be separated by the process of winnowing.
(c) Separation of sugar from tea can be done with filtration.
(d) Grain and husk can be separated with the process of decantation.  

Answer no. 9

(a) False
(b) False
(c) False
(d) False

Question no. 10

Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?

Answer no. 10

Ice should be added to lemonade after dissolving sugar. So it is possible to add more sugar before adding ice.


Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?

CLASS - 6 SCIENCE CHAPTER - 6 CHANGES AROUND US QUESTIONS AND ANSWERS

CLASS - 6 SCIENCE 

CHAPTER - 6

CHANGES AROUND US

QUESTIONS AND ANSWERS

Question no. 1

To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change is reversed?

Answer no. 1

Yes the change in the length of the dress can be reversed. The length of the dress can be increased by unfolding it. Hence shortening the length of dress can be reversed.

Question no. 2

You accidentally dropped your favourite toy and broke. This is a change you did not want. Can this change be reversed?

Answer no. 2

The broken toy cannot get back to its original shape. Hence change cannot be reversed.

Question no. 3

Some changes are listed in the following table. For each change,write in the blank column, whether the change can be reversed or not.

S. no.     Change            Can be reversed
                                                 (yes or no)                                                                         

1.  The sowing of a piece of wood      No  
2.  The melting of ice candy  -            Yes                       
3.  Dissolving sugar in water -           Yes                            
4.  The cooking of food -                      No 
 5. The ripening of a mango -             No 
 6.  Souring of milk-                              No

Question no. 4

A drawing sheet changes when you draw a picture on it. Can you reverse this change?

Answer no. 4

 If the drawing is made by pencil then this change can be reversed by erasing the drawing. If the drawing is made by colour then change cannot be reversed.

Question no. 5

Give examples to explain the difference between changes that can or cannot be reversed.

Answer no. 5

Changes that can be reversed 

1 - stretched rubber band to its normal size.
2 - opening and closing the door.

Changes that cannot be reversed

1 - cow dung to biogas.
2 - convention of milk into curd.

Question no. 6

A thick coating of a paste of plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on trying to keep the fractured bone in immobilised. Can the change in POP be reversed?

Answer no. 6

When plaster of Paris is mixed with water, it brings a  change in POP and on drying it becomes hard. One the POP is hardened, it is not possible to get back to its original form. Hence change in POP cannot be reversed.

Question no. 7

A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?

Answer no. 7

No. Change cannot be reversed.

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?      

CLASS 6 SCIENCE

CHAPTER - 4

SORTING MATERIALS INTO GROUPS

EXERCISES

QUESTION NO. 1

Name five objects which can be made from by wood.
ANSWER NO. 1

Chain

Doors

Box

Desk

Table

QUESTION NO. 2

Select those objects from the following which shine :

Glass bowl, plastic toy, steel spoon, cotton shirt

ANSWER NO. 2

Glass bowl and steel spoon

QUESTION NO. 3

Match the objects given below with the materials from which they could be made. Remember,an object could be made from more than one material and a given material could be used for making many objects. 

OBJECTS                         MATERIAL

Book                                 Glass
Tumbler                          Wood
Chair                                Paper
Toy                                    Leather  
Shoes                                Plastic

ANSWER NO. 3

OBJECTS                           MATERIAL

Book                                  Paper    
Tumbler                           Glass
Chair                                 Wood
Toy                                      Plastic
Shoes                                  Leather

QUESTION NO. 4

State whether the statements given below are true or false:

(a) Stone is transparent,while glass is opaque. 
(b) A notebook has lustre while eraser does not.
(c) Chalk dissolves in water.
(d) A piece of wood floats on water.
(e) Sugar does not dissolve in water.
(f) Oil mixes with water.
(g) Sand settles down with water.
(h) Vinegar dissolves in water.

ANSWER NO. 4

(a) False
(b) False
(c) False
(d) True
(e) False
(f) False
(g) True
(h) True

QUESTION NO. 5

Given below are the names of some objects and materials:
Water,basketball,orange,sugar,globe,apple and earthen pitcher

Group them as:
(a) Round shaped and other shapes
(b) Eatables and non eatables

ANSWER NO. 5

(a) Round shaped - Basketball,orange,globe,apple
Other shapes - Earthen pitcher
(b) Eatables - Orange,sugar,apple
Non eatables - Basketball,earthen pitcher,globe,water

QUESTION NO. 6

List all items known to you that float on water. Check and see if they will float on an oil or kerosene.

ANSWER NO. 6

1. Plastic ball
2. Wood
3. Matchstick
4. Thermocole 
5. Hair
6. Feather
They will float on oil and kerosene

QUESTION NO. 7

Find the odd one out from the following:

(a) Chair,bed,table,baby,cupboard
(b) Rose,jasmine,boat,marigold,lotus
(c) Aluminium,iron,copper,silver,sand
(d) Sugar,salt,sand,copper sulphate

ANSWER NO. 7

(a) Baby
(b) Boat
(c) Sand
(d) Sand

Also see answers of the following chapters -

Garbage in Garbage out

Air around us

Water

Fun with Magnets

Electricity and Circuits

Light, Shadow and Reflection

Motion and Measurement of Distances

The Living Organisms and their Surroundings

Body Movements

Getting to know Plants

Changes Around Us

Separation of Substances

Sorting Material into Groups

Fibre to Fabric

Components of Food

Food : Where does it com from ?

      

CLASS - 6 SCIENCE
CHAPTER - 3  FIBRE TO FABRIC
QUESTIONS AND ANSWERS

Question No. 1

Classify the following fibres as natural or synthetic:

nylon,wool,cotton,silk,polyester,jute

Answer No. 1

Natural Fibres - wool,cotton,silk,jute

Synthetic - nylon,polyester

Question No. 2

State whether the following statements are true or false:

(a) Yarn is made from fibres.

(b) Spinning is a process of making fibres.

(c) Jute is the outer covering of coconut.

(d) The process of removing seeds from cotton is called ginning.

(e) Weaving of yarn makes a piece of fabric.

(f) Silk fibre is obtained from the stem of a plant.

(g) Polyester is a natural fibre.

Answer No. 2

(a) True

(b) False

(c) False

(d) True

(e) True

(f) False

(g) False

Question No. 3

Fill in the blanks.

(a) Plant fibres are obtained from ________________ and ____________________.

(b) Animals fibres are ________________ and ________________.

Answer No. 3

(a) Cotton,jute

(b) Silk,wool

Question No. 4

From which parts of the plant Cotton and jute are obtained ?

Answer No. 4

Cotton is obtained from the fruit part of the plant and jute is obtained from the stem of the plant.

Question No. 5

Name two items that are made from coconut fibre.

Answer No. 5

Gunny and ropes are made from coconut fibres

Question No. 6

Explain the process of making yarn from fibres.

Answer No. 6

Spinning is the process by which yarn is made from fibres. In this process,fibres from a mass of cotton wool are drawn out and twisted. This process brings the fibres together to form a yarn. 

              This process is done by the device called Takli and Charkha. Both are hand operating devices. Spinning of yarn on a large scale is done with the help of spinning machine.

Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?