Question 2. (g) False; Polyester is a synthetic fibre. Jute is the outer covering of coconut. (a) True (b) False; The process of making yarn from fibres is called spinning. Fill in the blanks: Question 3. A lot of plastic pollutes our environment. g) Polyester is a natural fibre. Why? It is drawn by cocoon of silkworm.] (False) Concept insight: Silk fibre is obtained from cocoon of a silk moth. Answer: False. Answer: True. Q. Rearing and selective breeding of sheep is done. (c) Wool yielding animals bear hair on their body. e) Weaving of yarn makes a piece of fabric. Wool, cotton, silk, jute. It is a synthetic fibre- artificially made (F) Silk fibre is obtained from the stem of a plant. (d) Mulberry silk, tassar silk, mooga silk and eri silk are different types of silk produced from cocoons of different types of silk moths. (d) Hair trap a lot of air, which is a poor conductor of heat. 12. (a) Silkworms are caterpillars of silk moth. The silk worms feed on mulberry leaves and each worm spins a continuous thread, which is nearly 800 meters in length, to make a cocoon. Wool yielding animals have thick fur. (d) silviculture Answer: (c) Sericulture is a practice of rearing silkworms for obtaining silk while silviculture is a practice of developing and caring forests Question 2: Which… Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. True or False : Question 1. Give reasons. b) Spinning is a process of making fibres: - (False) c) Jute is the outer covering of coconut: - (False) d) The process of removing seed from cotton is called ginning: - (True) e) Weaving of yarn makes a piece of fabric: - (True) f) Silk fibre is obtained from the stem of a plant: - (False) g) Polyester is a natural fibre: - (False) Question 3: d) The process of removing seeds from cotton is called ginning. (a) Silk and Wool fibres are obtained from animals. (g) Polyester is a natural fibre. Question 3. Silk fibre made of How silk is made from silkworm yak Q. Cocoons are kept under sun. (C) False : Jute is obtained from jute plant (Corchorus). g) Polyester is a natural fibre. If false, correct them. [ Polyester is synthetic fibre.] Weaving of yarn makes a piece of fabric. Refuse (avoid) is the best way to manage plastic. State whether the following statements are True or False. SOLUTION: (A) True (B) False : Spinning is the process of making yarn from fibres. Answer: False. Silk is obtained from the cocoon of silk worms. Answer: True. Moth silk is not a type of silk. The process of removing seed from cotton is called ginning. NCERT Exemplar Problems Class 7 Science – Fibre to Fabric Question 1: The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . [ Silk fibre is obtained from animals. (d) True (e) True (f) False; Silk fibre is obtained from cocoon of the silk moth. (D) True (E) True (F) False : Silk fibre is obtained from silkworm (animal). 3. Give reasons. Answer. (b) Silk fibres come from cocoons of silk moth. g) False, polyester is not a natural fibre. (True) f) Silk fibre is obtained from the stem of a plant. Question 2. A natural fibre obtained by boiling of cocoons is called _____ Answer: Raincoat; Resin codes; polymer; plant fibre; silk; III. Synthetic Fibre. Which of the following would be the right gift (a) Woollen shawl (b) Silk scarf The cocoons are then unwrapped to get silk fibre, which is then woven into fabric. e) Weaving of yam makes a piece of fabric. Differentiate between the larva stage and pupa stage in the life cycle of a silk moth. (c) False; Jute fibre is obtained from the stem of jute plant. Spinning is a process of making fibres. Silk fibres are obtained from the silkworms which spin the fibres to form a cocoon in the pupa stage. 3. Nylon, polyster. 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