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

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