SOLUTION: (A) True (B) False : Spinning is the process of making yarn from fibres. (g) False; Polyester is a synthetic fibre. 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 . Question 2. Refuse (avoid) is the best way to manage plastic. f) False, silk fibre is not obtained from the stem of a plant. Answer: False. Question 3. 3. Differentiate between the larva stage and pupa stage in the life cycle of a silk moth. Jute is the outer covering of coconut. The cocoons are collected and boiled in water to kill the silkworms. Answer: True. Answer: True. (g) Polyester is a natural fibre. Concept insight: Silk fibre is obtained from the cocoon of a silk moth. Q. Cocoons are kept under sun. (b) Silk fibres come from cocoons of silk moth. Question 3. d) The process of removing seeds from cotton is called ginning. 3. e) Weaving of yarn makes a piece of fabric. Weaving of yarn makes a piece of fabric. g) False, polyester is not a natural fibre. 12. Moth silk is not a type of silk. (c) False; Jute fibre is obtained from the stem of jute plant. Answer: False. 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. (g) Polyester is a natural fibre. Wool, cotton, silk, jute. Silk is obtained from the cocoon of silk worms. (c) Wool yielding animals bear hair on their body. A lot of plastic pollutes our environment. 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. Nylon, polyster. (False) Concept insight: Silk fibre is obtained from cocoon of a silk moth. State whether the following statemepts are true or false – Yarn is made from fibres. (D) True (E) True (F) False : Silk fibre is obtained from silkworm (animal). Silk fibres are obtained from the silkworms which spin the fibres to form a cocoon in the pupa stage. Why? Wool yielding animals have thick fur. (C) False : Jute is obtained from jute plant (Corchorus). If false, correct them. A natural fibre obtained by boiling of cocoons is called _____ Answer: Raincoat; Resin codes; polymer; plant fibre; silk; III. 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: Silk fibre made of How silk is made from silkworm yak It is a synthetic fibre- artificially made (a) True (b) False; The process of making yarn from fibres is called spinning. (True) e) Weaving of yarn makes a piece of fabric. (a) Silk and Wool fibres are obtained from animals. Which of the following would be the right gift (a) Woollen shawl (b) Silk scarf Answer: True. [ Silk fibre is obtained from animals. Fill in the blanks: (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… (a) Silkworms are caterpillars of silk moth. True or False : Question 1. It is drawn by cocoon of silkworm.] 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. (F) Silk fibre is obtained from the stem of a plant. g) Polyester is a natural fibre. The process of removing seed from cotton is called ginning. (d) True (e) True (f) False; Silk fibre is obtained from cocoon of the silk moth. Q. Rearing and selective breeding of sheep is done. Spinning is a process of making fibres. 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