Saturday, July 29, 2017

CBSE CLASS 6 - Science - CHAPTER 3 : Fibre to fabric (Q and A) (#cbseNotes)

SUBJECT: Science
CHAPTER 3: Fibre to fabric

CBSE CLASS 6 - Science - CHAPTER 3 : Fibre to fabric (Q and A) (#cbseNotes)
From Cotton Boll to Fabric

Question 1: What is fibre?

Answer: Fibre is a thread like a strand from which yarn is made.

Question 2: What is yarn?

Answer: Yarn is a long continuous length of interlocked fibre which is woven or knitted for making garments.

Question 3: What is spinning?

Answer: Spinning is the process of twisting fibres by hand or using a machine, to obtain thread or yarn.

Question 4: What is weaving?

Answer: The process of making fabrics by crisscrossing two sets of yarn is called weaving.

Question 5: What is Retting?

Answer: The process of soaking jute stalks in water to let these rot to remove the sticky substance and it separates fibre is called retting.

Question 6: What is ginning?

Answer: The process of separating cotton fibre from its seeds is called ginning.

Question 7: What is knitting?

Answer: The process of making woollen fabrics by interlocking loops of the yarn is called knitting.

Question 8: Give some examples of plant fibres?

Answer: Cotton, jute, coir, silk cotton, hemp, flax

Question 9: What kind of soil is needed for growing cotton plant?

Answer: Black soil

Question 10: Why cotton clothes are preferred over synthetic fibre?

Answer: Because they are natural fibre and are biodegradable. They do not cause any pollution and are also good for our skin as they have natural ventilation.

Question 11: Name some items that are made from coir, jute, hemp, silk and cotton.

Coir: ropes, floor covering, stuffing in mattresses and pillows
Jute: jute bags, hat, slipper, rope, mat and sack
Hemp: ropes, carpets, nets, clothes and paper.
Flax: Used to make a fabric linen, rope  and quality paper.
Silk:  a fabric, sarees, necktie
cotton: Used as stuffing in pillows, sleeping bags and life jackets.

Question 12: Which fibre has resistance to fungus and mites?

Answer: Coconut fibre

Question 13: Which fibre has antibacterial property?

Answer: Hemp.

Question 14: What is the chemical composition of plant fibre?

Answer: cellulose

Question 15: What is the chemical composition of animal fibre?

Answer: protein.

Question 16: Fill in the blanks.
(a) Jute is obtained by the process of retting from the stems of ___________ plant.
(b) _______________ are devices used to spin cotton fibres.
(c) A loose strand or rope of cotton fibres is called _______________.
(d) Silk is obtained from the _______________ of the silkworms.
(e) _______________ cotton is used as an absorbent in hospitals.
(f) In olden days, spinning was done using _______________.
(g) _______________ was the first man-made fibre.

(a) patsun
(b) Looms
(c) silver
(d) cocoon
(e) Sterilised
(f) Charkha
(g) Rayon

Question 17: Write any three characteristics of the cotton plant.

(i) Cotton requires little rainfall at the ripening of seeds.
(ii) These plants are grown in black soil.
(iii) Cotton plants are bushy and are 1-3 metres tall.

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