date : 22.04.2020 (grade vi - science)
TRANSCRIPT
DATE : 22.04.2020
(GRADE VI - SCIENCE)
LESSON 1. FOOD:WHERE DOESIT COME FROM?
A.F ill in the blanks.
1. Living things which can make their own food are known as
producers.
2. Living things which derives nutrition from other are known
as .consumers
3. Living things which derive nutrient from dead and decaying
matter are known as decomposers.
4.C ow is a herbivore.
5. Plants animals and are our sources of food.
6. Sunlight water and are required by green plants to make
glucose photosynthesis and is released in process. oxygen
B. Match the correct answer.
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C. Complete this table.
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E. Long answer questions.
Q.1. What foods we get from plants?
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2. Give two uses of the following:
a. Jute
b. Cotton
Two uses of jute are as follows. Ans.
1. Jute is woven into curtains, chair coverings, carpets
and rugs.
2. Jute is used to make bags to pack agricultural
produce. Jute sacks or gunny bags are used in the
packaging industry.
. Two uses of cotton are as follows.
1. Cotton is used to make a number of textile products
such as shirts, socks, innerwear and towels. It is used
for making bedsheets as well.
2. Sterilised cotton is used in clinics and hospitals for
medical purposes.
3. What is animal fibres? Name any two.
Animal fibres are fibres obtained from animals. Ans.
They are listed below.
a. Wool: It is obtained from the hair of sheep and
some other animals like rabbit and deer.
b. Silk: It is obtained from the cocoon of the
silkworm.
4. What is loom? why they are used for?
Looms are machines used for weaving fabrics. They Ans.
may be either hand operated or power operated. In
weaving, two distinct sets of yarns or threads, called
the warp and the filling or weft, are interlaced with each
other to form a fabric or cloth. The warp threads run
lengthways of a piece of cloth and the weft threads run
across from side to side.
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9. Fibre obtain from coconut is called
a. Cotton
b. Coir√
c. Hemp
d. Jute
B. Very short answers.
1. Name the major trade route between Europe and Asia.
Silk RouteAns.
2. Name the process of making yarn from fiber.
SpinningAns.
3. Name the machine used for weaving of fabric.
LoomAns.
4. These two are the fibre that we obtain from the plants.
Jute and cottonAns.
5. Cotton fabric are mainly worn in which season.
SummerAns.
6. The fabric made up of this material is known as burlap.
Name the material.
JuteAns.
7. What are mattresses made from?
CoirAns.
8. What are jute sacks called?
Gunny bagsAns.
C. Short answers.
1. What type of weather conditions are not suitable for
wearing synthetic clothes?
Hot and humid weather conditions are not suitable Ans.
for wearing synthetic clothes. This is because they have
less absorption capacity and hence these fabrics do not
absorb sweat
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5. What are synthetic fibres?
Fibres obtained artificially by chemical processes Ans.
are called synthetic fibres. Nylon, rayon and polyester
are common synthetic fibres. They are made from
chemicals that are mainly obtained from petroleum.
Clothes made from synthetic fibres dry quickly and do
not wrinkle easily.
6. What is terry cloth?
Terrycloth is a fabric made from cotton. It is used Ans.
to make highly absorbent bath towels and robes. Terrycloth
is also used to make denim for blue jeans and jackets.
7. Is jute a biodegradable fibre?
Yes, jute is a 100 per cent biodegradable fibre. So,Ans.
it is used to make things which cannot be made using synthetic
fibres. For example, jute is used to make containers for young
saplings which can be planted directly along with the container.
8. Why do we wear woolen clothes in cold weather?
Wool is a uffy fibre and hence retains air. Since air Ans.
is a bad conductor of heat, wool has the property of retaining
heat. Woollen clothes do not allow our body heat to escape
and thus keep us warm. Therefore, we wear clothes made
from wool in cold weather
9. Name any two items made up of coconut fibres.
Two things made from coconut fibres are listed below. Ans.
1. Mats are made from coconut fibres. 2. Stuff mattresses
are made from coir.
10. Why do many people believe it is not right to use silk?
.Silk is obtained from the cocoon of the silkworm.Ans
A silkworm secretes a silk (raw) thread which it spins
around itself. Each silkworm spins a continuous thread of
up to 800 metres long to make a cocoon. The cocoon
is boiled in water to kill the silkworm. Then the cocoon
is unwound to get silk fibre. Many people believe that it
is not right to use silk as silkworms are killed in boiling
water while obtaining silk.
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D. Long answer questions.
1. Explain knitting. What is done by knitting?
.Knitting is a method by which a thread or yarn is turned Ans
into cloth. In knitting, a single yarn is used to make a piece of
fabric. Knitting consists of loops called stitches which are pulled
through each other. A set of stitches are held on a needle until
another loop can be passed through them. Knitting may be
done by hand or by machine. There are numerous styles
and methods of knitting by hand.
2. What is sericulture? Where did it originate?
.The rearing of silkworm to produce silk is called Ans
sericulture. Silk was first used and developed in China
about 7000 years ago. From China it came to India, and
then went to the Middle East, Europe and Africa. Silk
trade was so extensive and important that the major set
of trade routes between Europe and Asia came to be known
as the Silk Route.
3. How woollen clothes are made from wool?
.Wool is the fibre obtained from the hair of sheep Ans
and some other animals like rabbit and deer. The process
of removing wool from sheep by using special clippers is
called shearing. After shearing, the wool is packed in bales.
It is cleaned and combed by a machine in mills and then
separated and spun into a fibre. This fibre is then woven or
knitted to make woollen clothes.
4. Describe cotton and its uses.
.Cotton is a soft, staple fibre that grows in a form Ans
known as 'boll', around the seeds of the cotton plant.
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The fibre is collected by either hand-picking or machines.
The fibre is most often spun into yarns or threads and
is used to weave a soft, breathable textile. It is the
most widely used natural fibre.
The uses of cotton are as follows.
a. Cotton is used to make a number of textile products such
as socks, innerwear, T-shirts and bed sheets.
b. Cotton is used to make terrycloth
c. Cotton is used to make denim.
d. Cotton is used to make khadi. It is a hand-made fabric.
e. Cotton is widely used to stuff mattresses.
f. Cotton is used for clinical purposes also.
5. What are synthetic fibres? What is their advantage over
natural fibres?
.The fibres obtained artificially by chemical processes Ans
are called synthetic fibres. Nylon, rayon and polyester are
common synthetic fibres. They are made from chemicals
that are mainly obtained from petroleum. Synthetic fibres
have the following advantages over natural fibres.
a. Clothes made from synthetic fibres are stronger than the
clothes made from natural fibres.
b. Clothes made from synthetic fibres dry quickly.
c. Clothes made from synthetic fibres do not wrinkle easily.
d. they do not absorb sweat and so the fabrics made from
these fibres are not suitable for a hot and humid weather.
6. Write a paragraph on any two of the following:
a. Weaving
b. Knitting
c. Spinning
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Ans.Weaving: The process of arranging two sets of
yarns together to make a fabric is called weaving.
Weaving of fabric is done on looms. Looms are either
handoperated or power operated. In weaving, two
distinct sets of yarns or threads, called the warp and
the filling or weft, are interlaced with each other to
form a fabric or cloth. The warp threads run lengthways
of a piece of cloth, and the weft threads run across
from side to side. The manner in which the warp and
weft threads interlace with each other is known as the
weave.
b. Knitting: Knitting is a method by which a thread or
yarn is turned into cloth. In knitting, a single yarn is
used to make a piece of fabric. Knitting consists of
loops called stitches which are pulled through each
other. A set of stitches are held on aneedle until
another loop can be passed through them. Knitting may
be done by hand or by machine.
c. Spinning: The process of making yarn from fibres is
called spinning. In this process, fibres are drawn out
and twisted. This brings the fibres together to form a
yarn. A simple device used for spinning is a hand spindle
or takli. Another hand-operated device used for spinning
is the charkha. The invention of the spinning wheel
increased the output of individual spinners. Spinning
of yarn on a large scale is done with the help of
spinning machines.
7. What is silk?
.Silk is an animal fibre obtained from the cocoon of Ans
the silkworm. Silkworms are insects which feed on the
leaves of the mulberry trees. A silkworm secretes a silk
(raw) thread which it spins around itself. Each silkworm
spins a continuous thread of up to 800 metres long to
make a cocoon. The cocoon is boiled in water to kill the
silkworm. Then, the cocoon is unwound to get the silk
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1. Anything that occupies space has mass is called
matter.
2. Which state of matter is having stringent
intermolecular force?
Solid.Ans.
3. Which state does not have any definite volume?
Gaseous. Ans.
4. What type of conductors are woods and plastic?
Bad conductor. Ans.
5. What is classification?
Segregating different materials based on Ans.
different properties or characteristics.
6. What do you understand by texture?
Texture is the way something feels when we Ans.
touch it.
7. Differentiate between miscible and non-miscible liquid.
When two liquids are completely dissolved in Ans.
each other,they are known as miscible liquids
whereas liquids which do not dissolve in each other
and form separate layers are called non-miscible liquids.
8. What do you understand by thermal conduction?
The capability of a substance to either allow Ans.
or not allow the heat to pass through them.
9. Which state of matter has the largest
intermolecular space between them?
Gaseous Ans.
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D. Short answer questions.
1. Copper is use in household wiring. Why?
Copper is a very good conductor of electricity. Ans.
That is why it is used for household wiring.
2. Wooden log oat on water and does not sink. Why?
It is because of density that some materials Ans.
oat in water while others sink. The materials with
a lower density than water oat on water. A wooden
log has a lower density than water and hence it oats
on water and does not sink.
3. With respect to interparticle spaces rate, differentiate
between liquid and gases.
Ans.The molecules in a liquid are less tightly packed than
in a solid. This is because the forces of attraction
between the molecules of a liquid are less strong than
in a solid. As a result, liquids have greater intermolecular
spaces and the molecules can move within the liquid.
Hence, liquids do not have a definite shape, but have
a definite volume.
4. Solids have lowest diffusion rate. Why?
In solids, the molecules are packed closely and tightly. Ans.
They have strong intermolecular forces of attraction.
These forces make solids hard and rigid. Due to this reason,
the molecules of a solid cannot move about freely.
So, solids have the lowest diffusion rate.
5. When salt dissolves in water, where does it go?
When a solid dissolves in a liquid, it becomes part Ans.
of the liquid. When salt is added to water and stirred,
it dissolves in water. Salt breaks down to very small
particles and spreads throughout the water. The molecules
of salt go into the inter-molecular spaces of water and,
therefore, we cannot see them and we say that the
salt has dissolved.
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6. Why are handles of cooking vessels made of wood?
Handles of cooking vessels are made of wood. Ans.
This is because wood is an insulator (bad conductor
of heat) and does not allow heat to ow through it
easily. Insulators help in protecting our hands from
heat, when the vessels themselves are hot.
7. Name two substance which have lustre.
Gold and stainless steel are examples of two Ans.
substances that have lustre.
8. What is diffusion?
The process of gases and liquids spreading into Ans.
a surrounding substance is known as diffusion.
When we open a perfume bottle in one corner of the room,
its smell spreads throughout the room. This is because
the perfume mixes with air. Gases have the highest
rate of diffusion but different gases diffuse at
different rates.
9. Define density. How is the oating and sinking of a
substance related to its density?
The mass per unit volume of a substance is Ans.
called its density. Iron has a higher density than
cotton, and therefore, if we take the same mass
of both of them, cotton will occupy more volume.
It is because of density that some materials oat
in water while others sink. The materials with a
lower density than water, such as wooden logs,
oat on water. The substances with a greater
density than water, such as iron nails, sink in
water.
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allow our body heat to escape and thus keep us warm.
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3. Why do gas have highest rate if diffusion?
The process of gases and liquids spreading into a Ans.
surrounding substance is known as diffusion. Gases have
the highest rate of diffusion. In solids, the molecules
are packed closely and tightly. They have strong inter-
molecular forces of attraction. Due to this reason, the
molecules of a solid cannot move about freely. So, solids
have the lowest diffusion rate.In liquids, molecules have
lesser inter-molecular forces of attraction than solids.
So, they have a higher diffusion rate than solids.
In gases, the molecules have large distances between
them and they have very little inter-molecular forces of
attraction. Therefore, the molecules are not at all fixed
and
are always moving. This is the reason why molecules of
a gas can easily spread into a surrounding substance.
Thus, gases have the highest rate of diffusion.
4. What do you understand by magnetic property? Explain
it with examples.
The substances which get attracted by a magnet are Ans
called magnetic substances and are said to have magnetic
property. Iron, cobalt and nickel are magnetic materials.
Magnets attract iron and steel substances but do not
attract other metals like aluminium and copper. Examples
of a magnet are listed below. a. Materials that have
magnetic property are used in generators and motors.
b. Magnets are used in the doors of refrigerators.
c. Magnets are used inside the speakers of radio,
television and mobile phones. d. Magnets are widely
used in computers, as magnetic memory devices for
storing data. e. Magnets are used for picking up or
separating pieces of iron from heaps of waste
materials.
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5. Differentiate between transparent, translucent and opaque
substances with examples.
Ans.
6. Define conductors. Differentiate between insulators
and conductors.
Thermal conduction: The substances which allow heat to Ans.
pass through them are called good conductors of heat. All
metals are good conductors of heat; that is why cooking vessels
become hot. The substances which do not allow heat to pass
through them are called bad conductors of heat; examples are
wood and plastic. That is why the wooden handle of a frying pan
does not become hot. Electrical conduction: Materials which
conduct electricity are called conductors. For example, metals
such as copper, iron and silver are conductors. We use wires of
copper in our household wiring. Materials which do not conduct
electricity are called insulators or bad conductors of electricity
like wood, rubber, plastics, air, that is why electrical wires have
a rubber coating.