Class 6 Science Chapter 3 Important Questions
Class 6 Science Chapter 3 Important Questions of Fibre to Fabric with intext questions. This section contains Class 6 Science Chapter 3 Extra Questions and important Keywords. Explanation of all important topics are included in the form of questions here to provide an ample practice of Class 6 Science Chapter 3.After reading the chapter 3 from NCERT Textbook go through these questions to clear the concepts and make better grip on this chapter. In case of doubts, visit to Discussion Forum of Tiwari Academy.
Class 6 Science Chapter 3 Important Questions 2020-21
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Class 6 Science Chapter 3 Extra Questions 2020-21
Class 6 Science Chapter 3 Important Questions with suitable answers are given below updated for new academic session 2020-21. Download NCERT Solutions of other subjects along with Science of Class 6 free. Offline Apps are also free to download and use.
6th Science Chapter 3 Important Questions Set – 1
Name some materials which are made from different kinds of fabrics.
Generally, bed sheets, blankets, curtains, table-cloths, towels and dusters are made from different kinds of fabrics.
What do you mean by natural fibres and synthetic fibres?
Natural fibre: The fibres of some fabrics such as cotton, jute, silk and wool are obtained from plants and animals. These are called natural fibres. Cotton and jute are examples of fibres obtained from plants. Wool and silk fibres are obtained from animals.
Synthetic fibre: There are some fibres which made from chemical substances, and they do not obtain from plant or animal sources. These are called synthetic fibres. Some examples of synthetic fibres are polyester, nylon and acrylic.
Boojho and Paheli are confused to understand the relation among – threads, yarn, fabric, fibre, and strands. Will you help them to understand?
Fabrics are made up of yarns which is also known as thread and the thin strands of thread that we see in clothing materials are made up of still thinner strands called fibres.
So, this arrangement will be very useful to understand for them:
Fibres (thin strands) → Yarns (threads) → Fabric (clothes) .
Could you split up the yarn into thin strands?
Take out a yarn from a piece of cotton fabric. Place this piece of yarn on the table. Now, press one end of the yarn with your thumb. Scratch the other end of the yarn along its length with your nail. You can see, the yarn splits up into thin strands.
Fibre and Fabric
Fibre: The thin strands, of thread that we see in clothing materials, are made up of thinner strands called fibres.
Fabric: Fabric is cloth or other material produced by weaving together with cotton, nylon, wool, silk, or other threads. Fabrics are used for making things such as clothes, curtains, and sheets.
6th Science Chapter 3 Important Questions Set – 2
Why does sometime difficult to pass the thread through the needle of the eye?
Sometimes we can see, the end of the thread is separated into a few thin strands. This makes it difficult to pass the thread through the eye of the needle.
Write down some examples of plant fibres.
Cotton and jute are examples of fibres obtained from plants.
What are cotton balls?
The fruits of the cotton plant are about the size of a lemon, called cotton bolls.
Explain the climatic condition to grow the cotton plant.
The climatic conditions required for the cultivation of cotton are temperature, rainfall and soil. Cotton needs a warm climate. Summer temperatures of 21°C to 27°C, and abundant sunshine is necessary during the growth of the plant. Moderate to light rainfall is adequate for cotton cultivation. Rainfall ranging between 50 cm to 80 cm is adequate. Cotton can be grown on a variety of soils but the black soil is the best for cotton plants.
The Climatic Condition for the Jute Plant
Jute fibre is obtained from the stem of the jute plant. It is also called Golden fibre. It is used for making carpets, ropes, covers and mattress. The climatic conditions required for the cultivation of jute are temperature, rainfall and soil.
It is cultivated during the rainy season. Jute requires well distributed heavy rainfall of 150 cm. The jute plant is normally harvested when it is at flowering stage. The stems of the harvested plants are immersed in water for a few days. It requires uniformly high temperature 27°C throughout the year. It is grown on floodplains and delta’s. Although, Jute is a fibre obtained from the bark of the jute plant.
6th Science Chapter 3 Important Questions Set – 3
Mention the states name where jute plant harvested.
In India, jute is mainly grown in West Bengal, Bihar and Assam.
With the help of an activity, can you show the process of weaving?
A fabric is made up of two sets of yarns arranged together. The process of arranging two sets of yarns together to make a fabric is called weaving.
Let us try to weave some paper strips. Take two sheets of paper of different colours. Cut square pieces of length and width equal to 30 cm from each sheet. Now, fold both the sheets into half. On one sheet draw lines. Cut both the sheets along the dotted lines and then unfold. Weave the strips one by one through the cuts in the sheet of paper. The pattern of arranging two sets of yarns passing in one direction with other yarns at right angle to them.
What is ginning process?
The fruits of the cotton plant (cotton bolls) are about the size of a lemon. After maturing, the bolls burst open and the seeds covered with cotton fibres can be seen. From these bolls, cotton is usually picked by hand. Fibres are then separated from the seeds by combing. This process is called ginning of cotton. Ginning was traditionally done by hand. These days, machines are also used for ginning.
What do you know about the history of clothing materials?
In an ancient times people used the bark and big leaves of trees or animal skins and furs to cover themselves. After people began to settle in agricultural communities, they learnt to weave twigs and grass into mats and baskets. Vines, animal fleece or hair were twisted together into long strands. These were woven into fabrics. The early Indians wore fabrics made out of cotton that grew in the regions near the river Ganga. Flax is also a plant that gives natural fibres.
In ancient Egypt, cotton as well as flax were cultivated near the river Nile and were used for making fabrics. In those days, stitching was not known. People simply draped the fabrics around different parts of their body. Many different ways of draping fabrics were used.
With the invention of the sewing needle, people started stitching fabrics to make clothes. Stitched clothes have gone through many variations since this invention. But, it is also amazing that even today saree, dhoti, lungi or turban is used as an un-stitched piece of fabric.
The Process of Spinning
The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton wool are drawn out and twisted. This brings the fibres together to form a yarn. A simple device used for spinning is a hand spindle, also called takli. Another hand operated device used for spinning is charkha. Spinning of yarn on a large scale is done with the help of spinning machines. After spinning, yarns are used for making fabrics.
6th Science Chapter 3 Important Questions Set – 4
Write one differences between ginning and retting process.
Ginning: Ginning is the process of removing cotton seeds from cotton fibre by combing them.
Retting: Retting is the process of soaking the bundles of jute stem in water for few days. After that, they rotted and fibres are separated from them.
“We wear different types of clothes in different seasons”. Why? Explain the reason.
Generally, we feel comfortable when we wear different types of clothes in different seasons. Thus, every fabric is made up of some particular fibres which has a special characteristic. For example, we wear cotton clothes in summer because they absorb sweat and evaporates quickly and we feel comfortable. And we wear woollen clothes in winter season because as they trap the air and keeps our body warm and feeling comfortable.
Write two differences between natural and synthetic fibre.
1)The fibres which are obtained from plants and animals. These are called natural fibres. Such as cotton, jute, silk and wool.
2)They are costly and less durable.
1)The fibres which we get from synthesis of chemical substances, called synthetic fibre. Such as polyester, nylon and acrylic.
2)They are cheap and more durable
“Jute is not suitable for making clothes”. Why?
Jute is not suitable for making clothes because they are rough and coarse. Therefore, they are not comfortable for our body.
Jute is known as the Golden Fibre. That’s an appropriate name for the yellowish-brown colour, shiny appearance.
Other than this, it is the second most important natural fibre after cotton and now at present its demand has risen in India and also all around the world. And also, it is a cash crop and can be very profitable for the economy as its export can bring in a lot of money into the economy.
6th Science Chapter 3 Important Questions Set – 5
Why are coconut fibres used for making ropes? Write another use of coconut fibre.
Coconut fibres are used for making ropes because these fibres are rough and very hard. Another use of coconut fibre is in making mattresses.
One way of making fabric from yarn is weaving, what is the other?
Knitting is the other way of making fabric from yarn. In knitting, a fabric is made by interlocking loops of single yarn with knitting needles or machines.
Explain the process of making yarn from fibre.
The process of making yarn from fibre is called spinning. In this process, fibres from a mass of cotton are drawn out and twisted. This brings the fibres together to form a yarn. Spinning is done at home using simple devices like hand spindle (takli) and charkha. Generally, in large-scale big spinning machines are used.
Today a number of unstitched fabrics are used by both men and women. Can you give four examples of such clothes.
Saree, dhoti, lungi, turban, dupatta, towel etc. are the examples of such clothes.
The Process of Making Fabric from Yarn
The two main processes of making fabric from yarn are weaving and knitting.
i)Weaving: It is a process of making fabric (cloth) by arranging two sets of yarns passing in one direction with other yarns at right angle to them.
In other words, two sets of yarns are woven to make a fabric. Weaving of fabric is done on looms. The looms are either hand operated or power operated.
ii)Knitting: It is a process of making a fabric by interlocking loops of single yarn with knitting needles or machine.
Knitting fabrics are made of a single yarn running throughout the fabric. Socks and many other clothing items are made of knitted fabrics.
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