Wool and Silk are
  • a)
    Mixed fibres
  • b)
    Organic fibres
  • c)
    Synthetic fibres
  • d)
    Natural fibres
Correct answer is option 'D'. Can you explain this answer?

Class 7 Question

48 Answers
Sahil Singh Rajput answered Jul 10, 2018
Natural fiber

Prodyut answered Jul 10, 2018
Natural fibre

Dhir Bhandari answered Apr 13, 2020
Natural firbres because Natural fibres are divided into two categories 1. Plant fibres 2. Animal fibres
So, Wool is obtained from sheep and silk is obtained from silkworm. Sheep and silkworm are considered as animals. Hence, wool and silk are considered as animal fibers which is also known as Natural fibres.
So, correct answer is D.
Kindly upvote my answer if i am correct

Sakshi Verma Verma answered Mar 23, 2020
Wool and silk are natural fibres.

Samrat Tripathi answered May 03, 2020
Animal fibers are natural fibers that consist largely of particular proteins. Examples include silk, hair/fur (including wool) and feathers. The animal fibers used most commonly both in the manufacturing world as well as by the hand spinners are wool from domestic sheep and silk. Also very popular are alpaca fiber and mohair from Angora goats. Unusual fibers such as Angora woolfrom rabbits and Chiengora from dogs also exist, but are rarely used for mass production.

Not all animal fibers have the same properties, and even within a species the fiber is not consistent. MERINO is a very soft, fine WOOL, while COTSWOLD is coarser, and yet both Merino and Cotswold are types of SHEEP. This comparison can be continued on the microscopic level, comparing the diameter and structure of the fiber. With animal fibers, and NATURAL FIBRES in general, the individual fibers look different, whereas also SYNTHETIC FIBRE look the same. This provides an easy way to differentiate between natural and synthetic fibers under a microscope.

SILK
Silk is a "natural" protien fibre, some forms of which can be wovens into textiles. The best-known type of silk is obtained from cocoons made by the larve of the silkworm bombyx bori reared in captivity. Rearing of silks is called secriculture. Degummed fibers from B. mori are 5-10 μm in diameter. The shimmering appearance for which silk is prized comes from the fibers' triangular prism-like cross-sectional structure which allows silk cloth to refract incoming light at different angles.

The length of the silk fiber depends on how it has been prepared. Since the cocoon is made of one strand, if the cocoon is unwound carefully the fibers can be very long.

Spider silk is the strongest natural fiber known. The strongest dragline silk is five times stronger than steel and three times tougher than kelvar. It is also highly elastic, the silk of the ogre-faced spider can be stretched six times its original length without damage. As of 2005, there is no synthetic material in production that can match spider silk, but it is actively being sought by the U.S. military for such applications as body armour, parachutes and rope. Genetically engineered goats have been raised to produce spider silk in their milk at a cost of around $1,500 per gram.

WOOL
Wool is a natural fibre which is take from animals.

N
BOTH THE FIBRE ARE NATURAL FIBRE

Natarajan Raju answered May 04, 2020
The correct answer is option d) Natural fibre

Ashwitha Sareesh answered May 14, 2020
Because they obtained from animals

Riya Saxwna answered Mar 23, 2020
Natural fibre because wool we get from sheep and silk we get from silkworm.and they both are livingthing

Kalpana Salunke answered May 16, 2020
D)natural fibre

Nandika Nandika answered Apr 22, 2020
Natural fibres
silk and wool are it came from sheep silk warm

Shiva Yadav answered Apr 20, 2020
Natural fibre because they obtained by sheep's and silkworm

Simran Bajuri answered Feb 04, 2020
Wool and silk are natural fibres obtained from plants and animals.

Sandhya answered Feb 06, 2020
Fibres which are obtained from plants and animals are called natural fibres . Silk is obtained from silkworms and wool is obtained from animals (sheep , goat etc.). So, silk and wool are natural fibres.

Mahananda Kedare answered May 14, 2020
Because they are natural

Abhimannu Kumar answered May 06, 2020
Wool and Silk are - Natural fibre

Yash Yadav answered Jun 01, 2020
The right answer is - Natural fibres beacuse wool and silk are produced by naturally

Siddhesh Bagad answered Apr 26, 2020
Wool and Silk are made from animals so they are natural fibers .Wool is given by sheep/ goat and Silk is given by the cocoons of the Silkworm.

Deepti. answered Jul 14, 2018
Natural fibers

Mastermind Of All Subjec answered May 19, 2020
Wool and silk are natural fibre because silk is obtained from silkworms and wool is obtained from sheep so the wool and silk are natural fibre

Himaja Ammu answered Jul 10, 2018
They r natural fibres because they r obtained naturally wool from sheep...and silk from silk worm

Alka Awasthi answered Jun 05, 2020
Natural fibres because these fibers grow on plant

Nandita Biswas answered Mar 20, 2020
THEY ARE NATURAL FIBERS

Shagun Sharma answered Jun 13, 2020
Because it is a animal fiber and plants and animals fibers are called natural fibres

Richa Borgaonkar answered Jul 10, 2018
Wool and Silk are natural fibres because Wool is obtained from sheep and Silk is obtained from cocoon and they both are natural organisms so the fabric obtained from them is also natural fibres.

Yuvraj Singh answered Apr 05, 2020
D because they are received from natural resources

Subhi Prajapati answered May 22, 2020
Option Dis correct answer

Prapti Kushwaha answered Apr 22, 2020
Natural fibres are fibers that are produced by plants, animals, and geological processes .They can be used as a component of composit materials, where the orientation of fibers impacts the properties. Natural fibers can also be matted into sheets to make paper or felt.

Raj Kumar Singh answered Jun 04, 2020
Natural fiber as natural fiber are obtained from plants or animals and wool is obtained from sheep etc. And silk from silkworms.

Sreyash Suyigya answered Mar 15, 2020
Wool and Fiber are natural fibres because they are obtained from the plants or nature...

Jignesh Patel answered Mar 23, 2020
Option D is correct

Kartik Anudeep answered May 27, 2020
Natural fibers are the fibers which we get by the nature and as we get wool from sheep and silk from silk worms they are called natural fibers..

प्यारे लाल answered May 05, 2020
Animal Fibre -Wool and silk.Wool. wool comes from sheep, goat, yak and some other animals.These wool-yielding animals.....

Sanjay Kumar Pradhan answered Mar 27, 2020
Answer is natural fiber

Aditi Sharma answered May 03, 2020
Wool and silk are natural fibres because wool and silk are obtained from animals and animals are part of nature so,ultimately wool and silk are considered as natural fibres

Shyam Kumar answered 20 hours ago
Wool and silk are natural fibre because it doesn't prepare by human, it comes from nature.

Gargi Singh answered Feb 05, 2020
Wool and silk are natural fibre which is obtained by animals and plants..

Harshal Patil answered May 19, 2020
Natural fibre
because it comes from sheep and silkworm respectively

Drama Queen answered Apr 07, 2020
Yes because they obtained from plants and animals and plants and animals are natural sources

Raj Datta answered Mar 25, 2020
As wool and silk are obtained from animals so they are animal fibers and as animal fibers are also natural fibers as they are obtained from nature so wool and silk are natural fibers.

Omsubham Gouda answered Apr 26, 2020
Plants : cotton, jute
amimal: silk,wool
plants and animals are both belong to nature thus,they made for thaem and we take that for making sweaters etc and they are natural but remember that we also make
cloth like polyester, nylon,acrylic this can't go in natural because made by us. From petroleum I hope you what is petroleum. While seperating from petroleum other things also be found from deep into ground. This things to company of making cloth and they make now you understand about all. But man made cloth is much better than natural but in some case naural made is very popular
then man made cloth .

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Lakshanaa Udayashankar answered May 12, 2020
Natural fibers...as they are obtained from animal.

Shweta Srivastava answered May 19, 2020
Natural fibre because it in taken from the nature

Atcha Janani answered Jun 10, 2020
# As it is a Natural fibre

Yukta Agarwal answered Jun 05, 2020
Because natural fiber is obtained from plant and animal

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