3. Classify these materials into natural and synthetic fibres.
acrylic, wool, jute, cotton, silk, polyester, nylon
Natural fibres
Synthetic fibres

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Solution

The fibres which are obtained naturally from plants and animals are known as natural fibres while other fibres which are made chemically or man made are called Synthetic fibres.
Acrylic, polyester and nylon are synthetic fibres that are synthesized with the help of chemicals in factories whereas jute and cotton are natural fibres obtained from plants and wool and silk are natural fibres obtained from animals.
Therefore,
Natural fibres Wool, jute, cotton and silk
Synthetic fibres acrylic, polyester and nylon

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Q. Are these statements true or false? Rewrite the false ones correctly.
(a) Polymers are small molecules made by stringing together several monomers.
(b) Blended fabrics contain only synthetic fibres.
(c) Dusters made of nylon or other synthetic materials are good for use in the kitchen.
(d) Polyester fibres are obtained from petroleum products.
(e) Terylene, a synthetic fibre, can be used instead of wool.
(f) Rayon, which is obtained from cellulose, is a natural fibre.

The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains a large number of ester groups. Another synthetic fibre C is made of a polymer D which consists of a number of glucose units joined one after the other.

(a) Which fibre could be (i) terylene (ii) rayon , and (iii) nylon ?

(b) Name the polymer D.

(d) Which fibre (A, B or C) contains the same type of grups as those in a PET jar ?

Q. Which of these is a natural fibre?
(a) rayon
(b) cotton
(c) nylon
(d) polyester

Q. Which of the following is a synthetic fibre?
(a) Wool
(b) Cotton
(c) Nylon
(d) Silk

The following is an answer given by Boojho to a question asked by his teacher- “Cotton, wool, silk and jute are classified as natural fibres whereas nylon and polyester are classified as synthetic fibres”. Can you tell what question the teacher has asked?

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3. Classify these materials into natural and synthetic fibres.acrylic, wool, jute, cotton, silk, polyester, nylonNatural fibres __________________________Synthetic fibres __________________________

3. Classify these materials into natural and synthetic fibres.
acrylic, wool, jute, cotton, silk, polyester, nylon
Natural fibres
Synthetic fibres