RBSE Solutions for Class 6 Science Chapter 4 Natural Fibers

RBSE Solutions for Class 6 Science Chapter 4 Natural Fibers are part of RBSE Solutions for Class 6 Science. Here we have given Rajasthan Board RBSE Class 6 Science Chapter 4 Natural Fibers.

Board RBSE
Textbook SIERT, Rajasthan
Class Class 6
Subject Science
Chapter Chapter 4
Chapter Name Natural Fibers
Number of Questions Solved 58
Category RBSE Solutions

Rajasthan Board RBSE Class 6 Science Chapter 4 Natural Fibers

Intext Questions

Question 1.
The clothes, bed – sheets, curtains, etc. at our homes are made up of different clothes. Will you identify some clothes from these? (Page 27)
Answer:
Yes, some of the these clothes, like – quilt, sweater, etc. are made of wool; while some clothes like-curtain, shirt, handkerchiefs are made of cotton; some clothes like, kuna, saree, etc. are made of silk and some clothes like trousers, shirts, etc. are made of synthetic fibers.

Question 2.
How fibers get converted into yarn? (Page 29)
Answer:
Yarn is made from fiber by the process of spinning. In this process, cotton is pulled and gently twisted simultaneously. This makes fibers close to each other and yarn is formed.

Question 3.
Have you ever observed near pond or river the clothes of different colours. How these clothes are differently coloured? (Page 30)
Answer:
To colour clothes many types of dyes are used.

Question 4.
Are all the clothes coloured similarly? (Page 31)
Answer:
No, different types of clothes are coloured differently.

Question 5.
What is mixed to enhance colour on cotton clothes? (Page 31)
Answer:
Salt is mixed to enhance colour on cotton clothes.

Question 6.
What the colouring men do to colour a single cloth with different colours? (Page 31)
Answer:
The colouring men proceed from light shade to darker shade with the process of tie and dye when a single cloth is to be coloured with different colours.

Question 7.
In which art the printing on clothes is done? (Page 31)
Answer:
There are so many arts of printing on clothes in Rajasthan, but the major arts known by the names of Sanganer ( Jaipur), Jodhpur, Udaipur, Barmer, Bhilwara, etc. are very famous. The instruments used in these arts for printing are impression blocks. They are also called bhant.

Question 8.
How the hair of animals used to obtain wool? (Page 32)
Answer:
Wool is obtained from the hair of camel, sheep, goat, yak, rabbit, etc.
The following processes are involved in the making of wool:

  1. Shearing
  2. Scouring
  3. Sorting
  4. Reeling

Activities

Activity-1

Question 1.
Pull a single thread from any piece of cloth. What this fiber or thread is made up of?
Answer:
Some fibers are obtained from plants and animals while some are made by human a with the help of chemicals.

Exercises

Choose the correct options

Question 1.
The process of separating cotton fibers from its balls is
(a) spinning
(b) weaving
(c) hand picking
(d) scouring
Answer:
(c) hand picking

Question 2.
The example of natural fiber is
(a) rayon
(b) nylon
(c) cotton
(d) dacron
Answer:
(c) cotton

Question 3.
The example of animal fiber is
(a) cotton
(b) nylon
(c) wool
(d) jute
Answer:
(c) wool

Question 4.
From whom the fibre of silk is obtained
(a) sheep
(b) goat
(c) wool
(d) silk worm
Answer:
(d) silk worm

Fill in the blanks
1. The process of making thread from fibre is called …………..
2. The rearing of silk moth is known as …………
3. The ………. get wrapped of silk fibre and form cocoon.
4. Nylon, rayon and dacron are examples of ……….. fibres.
Answer:
1. spinning
2. sericulture
3. caterpillars
4. artificial

Short Answer Type Questions

Question 1.
Explain the difference between natural fibers and synthetic fibers.
Answer:

  1. Natural Fibers – Those fibers which are obtained from plants and animals are called natural fibers.
    Example : wood, cotton, jute, moonj, silk, etc.
  2. Synthetic Fibers – Those fibers which are made by human with chemicals are called artificial fibers.
    Example: Rayon, Dacron, Nylon, etc.

Question 2.
Write any two significance of cotton fiber.
Answer:
Two significance of cotton fibers are:

  1. They are cool
  2. They absorb moisture.

Question 3.
In which state of our country, is silk manufactured?
Answer:
Silk is mainly manufactured in Karnataka, Andhra Pradesh and Tamil Nadu.

Question 4.
Explain the process of making thread from fiber.
Answer:
The process of making thread from fiber is called spinning. In this process, cotton is pulled and gently twisted simultaneously. This makes fiber close to each other and thread is formed.

Long Answer Type Questions

Question 1.
List the names of clothes used in our daily life and write by which type of fiber they are formed of?
Answer:
Clothes and fibers used in them:

Clothes Fiber used
Handkerchief Cotton
Dhoti Cotton
Shirt Cotton/Synthetic
Quilt Cotton
Sweater Wool
Socks Nylon/Rayon
Saree Silk/Cotton
Jacket Nylon/dacron
Trousers Dacron

Question 2.
How is silk obtained from silk worm? Explain.
Answer:
Female silk worm lays eggs on mulberry leaves. These eggs hatch into caterpillar larvae. Larvae develop by eating leaves of this plant. Caterpillars form a thread structure (cocoon) around themselves. In cocoon, caterpillar changes to pupa stage. Before the cocoon changes to adult, it is kept in sun or hot water or steam to obtain silk.

Question 3.
Explain the process of obtaining wool from sheep?
Answer:
The following processes are involved in the making of wool:
(a) Shearing – The hair are shaved from sheep. These hair are spin to form yarn.
(b) Scouring – It is the process of making fibers free from oil, dust. etc. For this process, the hair are dipped in big tanks and then washed with water.
(c) Sorting – Different types of hair are sorted. The small, soft and puffed fibers called ’Burr’ are sorted separately.
(d) Reeling – The process of making threads straight and making its roll is called reeling.

Group Activity

Do this group activity by making 4-6 groups according to the strength of your class and present in your class.
Group 1 – Explanation of animals for obtaining wool.
Group 2 – Production of wool.
Group 3 – Cloth from cotton plants.
Group 4 – Obtaining silk cloth from silk worm.
Group 5 – List of natural and artificial fiber.
Group 6 – List of things formed from moonj
Answer:
Group 1 – Animals that provide wool are sheep, goat, camel, yak, rabbit.

Group 2
– Steps of Production of wool:
(a) Shearing – The hair are shaved from animals.
(b) Scouring – The fibers are made free from oil, dust, etc.
(c) Sorting – Different types of hair are sorted.
(d) Colouring – Wool is coloured in different colours.
(e) Reeling – The process of making threads straight and making its roll is called reeling.

Group 3 – Process of making cloth from cotton plants Following are the processes for obtaining cloth from cotton plants :
(a) Cotton from cotton balls – Cotton is generally picked by hand. Fibers are then separated from the seeds by combing. This process is called ginning of cotton.
(b) Spinning – The process of making yarn from fiber is called spinning.
(c) Weaving – The process of arranging two sets of yarns together to make a fabric is called weaving. In knitting, a single yam is used to make a piece of fabric.

Group 4 –
Obtaining silk cloth from silk worm. Before the cocoon changes to adult, it is kept in sun or hot water or steam to obtain silk. The production of silk thread from fibers is called reeling.

Group 5 –
List of natural and artificial fibers. Natural fibers-cotton, jute, moonj, wool, silk. Artificial fibers-rayon, dacron, nylon, terycot, plastic. Group 6 – List of things formed from moonj. Huts, traditional furniture (table, mudda), eco-friendly toys, ropes and used in cots, chairs and decorative items etc.

Practical Work

Question 1.
Draw a print on an un useful cloth by making blocks of lady finger, potato and lotus in the presence of your teacher.
Note : Student should do it on their own.

Question 2.
Visit to a weaving industry and observe the weaving process.
Note : Students should do it on their own.

Question 3.
Find out which crop is grown for obtaining fiber and uses of this at your nearby place?
Answer:
Cotton and moonj are the crops that are grown at our nearby place for obtaining fiber. Cotton fiber is used in Rajai covers, bed-sheets, clothes, etc. Cotton is used in filling pillows and rajai. Moonj is used in making ropes for cots, mudda, toys, mats, etc.

Question 4.
Collect knowledge about BT cotton from an ag-ricultural scientist or visit enviro.nic.in./divisions/ csnv/btcotton/bgnote./pdf.
Answer:
BT cotton is a genetically modified crop. It stands for Bacillus thuringiensis a soil bacterium which contains a toxic gene called BT gene. The aim is to make the cotton crop resistant to bollworm. The gene is inserted into the cotton seed through genetic engineering. Now, the toxin is not harmful to the plant but BT gene becomes part of it.

Other Important Questions

Multiple Choice Questions

Question 1
is not a natural fiber.
(a) rayon
(b) silk
(c) wool
(d) cotton
Answer:
(a) rayon

Question 2.
What is the process of separation of fibers from cotton seeds called?
(a) spinning
(b) combing
(c) hand picking
(d) weaving
Answer:
(b) combing

Question 3.
A mono cot plant is
(a) cotton
(b) jute
(c) moonj
(d) mulberry
Answer:
(c) moonj

Question 4.
Jute is used in making of
(a) maty
(b) bag
(c) door mat
(d) all of these
Answer:
(d) all of these

Question 5.
Mudda are made up of
(a) cotton
(b) moonj
(c) jute
(d) mustard
Answer:
(b) moonj

Fill in the blanks

1. The fibers obtained from plants and animals are called ………… fibers.
2. We get cotton from …………… of cotton plant.
3. The ………….. of moonj plant is used to make huts and traditional furniture.
4. The process of making yam from fiber is called ………….
5. The process of arranging two sets of yarns together to make a fabric is called ………….
Answer:
1. natural
2. fruits
3. stem
4. spinning
5. weaving

Very Short Answer Type Questions

Question 1.
How many types of fibers are there?
Answer:
There are two types of fibers-natural and synthetic.

Question 2.
When is jute plant harvested to obtain its fiber?
Answer:
Jute plant is harvested when it starts flowering.

Question 3.
What is the botanical name of moonj plant?
Answer:
Saccharum moonja.

Question 4.
Which plant is used to make Eco – friendly toys?
Answer:
The moonj plant.

Question 5.
Write the names of two simple devices for spinning.
Answer:
Takli andCharkha.

Question 6.
Why is salt added while colouring of clothes is done?
Answer:
It is done to enhance the colour on cotton clothes.

Question 7.
What is the importance of bandhej process?
Answer:
It makes clothes look attractive.

Question 8.
In Rajasthan, where do you find the best art of printing?
Answer:
In Sanganer (Jaipur)

Question 9.
What is the advantage of having hair on the body of animals?
Answer:
Hair keep the body of animals warm.

Question 10.
Where does silk moth resides and what does it eats?
Answer:
Silk moth resides on mulberry plant and eats its leaves.

Short Answer Type Questions

Question 1.
What are natural and artificial fibers? Give examples of each.
Answer:

  1. Natural Forbes – Those fibers which are obtained from plants and animals are called natural fibers.
    Example – wool, cotton, jute, moonj, etc.
  2. Artificial fibers – Those fibers which are made by human with chemicals are called artificial fibers.
    Example – rayon, dacron, nylon, etc.

Question 2.
How is cotton obtained from cotton plant?
Answer:
We get cotton from cotton plant. The fruits of cotton are of the size of a lemon. When they mature, cotton balls fall off from the plant and cotton fibers can be seen. Cotton is picked by hand. Then, fibers are separated from the seeds by combing.

Question 3.
What do you understand by weaving ? Explain.
Answer:
Weaving The process of arranging two sets of yarns together to make a fabric is called weaving. Weaving of fabric is done on looms.

Question 4.
Where is printing of clothes done in Rajasthan?
Answer:
Sanganer (Jaipur) in Rajasthan is a major centre of printing. Other centers of printing in Rajashtan are Jodhpur, Udaipur, Banner, Bhilwara, Pali, Bagru, Aakola (Chittorgarh) etc.

Question 5.
What are the types of cotton clothes? Write the significance of cotton clothes.
Answer:
Types of cotton clothes are muslin, rubies, vial, poplin etc. The significance of cotton clothes are :

  1. They are cool.
  2. They are easier to dye.
  3. They absorb moisture.

Question 6.
In which part of India, sheep and goats are reared for obtaining wool?
Answer:
In Jammu and Kashmir, wool is obtained from Kashmiri goat or Angora goat. In many states like Himachal Pradesh, Uttrakhand, Arunchal Pradesh, Rajasthan, Punjab and Gujarat, mainly sheep are reared for wool.

Question 7.
Which states of our country produces silk? Write the significance of silk clothes.
Answer:
About 90% of India’s production of silk is done in Karnataka, Andhra Pradesh and Tamil Nadu. Significance of silk clothes are:

  1. They do not wrinkle.
  2. They are shiny and attractive.
  3. They are light weighted.

Long Answer Type Questions

Question 1.
Explain following
1. Jute
2. Moonj
Answer:
1. Jute – Jute fiber is obtained from the stem of jute plant. To obtain jute fiber, its plant is harvested when it starts flowering. Its stems are then immersed in water for a few days. The fibers are then separated by hands. The fibers are converted into yarns to make fabric. This fabric is used to make door mates. Chatai and bags.

2. Moonj – Moonj is obtained from moonj grass. Its botanical name is Sacccharum moonja. It is a monocot plant. It is generally found in Nagaur, Bikaner, Sikar, Jhunjhunu and Ajmer districts. Its stem is used to make huts, traditional furniture (table, mudda), and eco-friendly toys. Its fibres are used to make cots, chains and decorative items.

Question 2.
Explain the colouring of cotton clothes?
Answer:
For colouring of cotton clothes many types of dyes are used. The colour which is to be used for colouring is mixed with desired colour in cold water first. Now, this colour is poured in hot water and salt is added. It is stirred with a stick. Now clothes are dipped in it till the water cools. After this clothes are squeezed well and dried in shade.

Question 3.
Explain briefly the Bandhej technique. (Tie and Dye)
Answer:
Beautiful pattern are made on clothes by bandhej. In this technique, the fabric is tied firmly with threads of different colours at various places and then dyed. After this dying is done, the place where the cloth is tightly threaded, colour do not spread. If we have to use more than one colour, we proceed from light shade to darker one. After colouring with the colour, it is kept to dry completely. When it dries, the threads are opened carefully. The clothes are then ironed with a warm iron. Now, the clothes of tie and dye are ready.

Question 4.
How is printing done on clothes? Explain.
Answer:
For printing, vail and cotton clothes like muslin cloth and silk clothes are used. Impression block is used for printing, and it is also called bhant. These blocks are made of wood or metal alloys. After making impression, they are keep in seshame oil for a night. Firstly colours are formed in a container for printing. Now, this colour is poured on a sponge. Now, printing block is kept on sponge so that it takes the colour. Printing is done in fixed pattern from these blocks. This printing is done on borders or on whole cloth. Now a days, machines are also used for printing.

Question 5.
What is sericulture? Explain the life – cycle of silk worm.
Answer:
Sericulture is the process of rearing of silk worm for obtaining silk. Life Cycle of silk worm: Female silk worm lays eggs on leaves of mulberry tree. These eggs hatch into caterpillar or larvae. They develop by eating leaves of this plant. They have a silk gland which secretes a substance, which helps them to form a thread like structure. Later, this thread like structure takes a round shape which is called cocoon. In cocoon, caterpillar changes into pupa. Then the pupa changes into adult silkworm and complete its life – cycle.
RBSE Solutions for Class 6 Science Chapter 4 Natural Fibers 1
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