CBSE Class 7 Science Fibre to Fabric Worksheet Set A

Read and download free pdf of CBSE Class 7 Science Fibre to Fabric Worksheet Set A. Download printable Science Class 7 Worksheets in pdf format, CBSE Class 7 Science Chapter 3 Fibre to Fabric Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Science Class 7 Assignments and practice them daily to get better marks in tests and exams for Class 7. Free chapter wise worksheets with answers have been designed by Class 7 teachers as per latest examination pattern

Chapter 3 Fibre to Fabric Science Worksheet for Class 7

Class 7 Science students should refer to the following printable worksheet in Pdf in Class 7. This test paper with questions and solutions for Class 7 Science will be very useful for tests and exams and help you to score better marks

Class 7 Science Chapter 3 Fibre to Fabric Worksheet Pdf

Fibre to Fabric
 
ACTIVITY- 3.1 : To know about the hairs of some animals. 
 
Question 1- Name any two natural fibres obtained from plants.
Answer- Cotton and jute.
 
Question 2- Name any two natural fibres obtained from animals.
Answer- Wool and silk.
 
Question 3- Name any three animals which provide us wool.
Answer- Sheep, goat, camel and yak.
 
Question 4- Why do some animals have a thick coat of hairs?
Answer- Hairs trap a lot of air. Air is a poor conductor of heat, so it does not allow the body heat to escape and keep the body warm.
 
ACTIVITY- 3.4 : Burn test for Natural and Synthetic fibres. 
 
Question 1- What difference in smell you notice on burning silk thread, artificial silk thread and wool?
Answer- Smell of burning thread of artificial thread is like burning of paper. But smell of burning of thread of
silk and wool is like burning of hairs.
 
Question 2- What type of ash is formed in the above activity?
Answer- Artificial silk is converted into soft black ash on burning, while silk and wool is converted into dark brittle and easily crushable bead.
 
Question 3- Does the smell of burning of silk thread is same as the smell of burning woolen thread?
Answer- Yes.
 
EXERCISE
 
Question 1- Fill In The Blanks.
 
(i). Wool is obtained from the fleece (hair) of sheep, goat and yak
(ii). Long hair on the body protect animals from winter.
(ii). Removal of fleece from the skin of animal is called Shearing.
(iv). Rearing of silkworm is called Sericulture.
(v). The process of unwinding the filaments from the boiled cocoons, is called Reeling.
 
Question 2- Match The Following :
7th.sci.eng.july.aug.new 1
 
Question 3. Choose The Correct Answer.
 
(i). The fibre which is not produced by animals :
a) Angora Wool     b) Wool    c) Jute (✓)    d) Silk
 
(ii). Wool is commonly obtained from :
a) Sheep    b) Goat    c) Yak    d) All of the above (✓)
 
(iii). Washing of sheared hair is called :
a) Scouring (✓)    b) Sorting    c) Shearing    d) Dyeing
 
(iv). Wool is chemically :
a) Fat b) Protein (✓)    c) Carbohydrate    d) None of these
 
(v). The animal that does not yield wool is :
a) Alpaca    b) Woolly dog (✓)    c) Camel    d) Goat
 
Question 4- Write True Or False.
 
(i) Air is bad conductor of heat. (True)
(ii) Air trapped in long hair does not allow body heat to escape from body. (True)
(iii) In Tibet and Ladakh, wool is obtained from yak. (True)
(iv) Rearing of silk moths is called apiculture. (False)
(v) The cover around the body of caterpillar is called cocoon. (True)
(vi) Tassar silk and moonga silk are produced by silk moth who have been feeding on non-mulberry trees. (True)
 
Question 5- Very Short Answer Type Questions.
 
(i) Name any two plant fibres and animal fibres.
Answer- Plant fibres- Cotton, jute.
Animal fibres- Wool and silk.
 
(ii) What is sericulture?
Answer- Rearing of silkworms for production of silk is known as sericulture.
 
(iii) Name the common animals who yield fleece.
Answer- Sheep, goat, yak and camel.
 
Question 6- Short Answer Type Questions.
 
(i) What you understand by Angora and Kashmere wool?
Answer- Angora wool is obtained from Angora goats found in hilly regions such as Jammu and Kashmir,while Kashmiri wool is obtained from Kashmiri goat.
 
(ii) Write the states where the following breeds of sheep are found:-
Lohi, Bakharwal, Nali and Marwari.
Answer-
Lohi- Rajasthan, Punjab.
Bakharwal- Jammu and Kashmir.
Nali- Rajasthan, Hariana, Punjab.
Marwari- Gujarat.
 
(iii) Write all the steps involved in processing of fibres into wool.
Answer- (1) Shearing, (2) Scouring, (3) Sorting, (4) Combing, (5) Dyeing, (6) Spinning.
 
(iv) Why do some animals have a thick coat of hair.
Answer- Hairs trap a lot of air. Air is a poor conductor of heat, so it does not allow the body heat to escape and keep the body warm.
 
(v) How is silk moth reared?
Answer- Eggs of silk moth are stored carefully on strips of cloth or paper and sold to silkworm farmers. The farmers keep eggs under hygienic conditions, under suitable temperature and humidity. The eggs are warmed to a suitable temperature for the larvae to hatch from eggs when mulberry trees bear a fresh crop. The worms are kept in bamboo trays along with mulberry leaves. By eating leaves larvae change into caterpillar, then caterpillar into cocoons. The farmers get silk fibres from cocoon.
 
Question 7- Long Answer Type Questions.
 
(i) Write all the steps in processing silk from cocoons.
Answer-
(1) Boiling- The cocoons are boiled in hot water to kill larvae and to soften the silk gum.
(2) Reeling- The process of taking out threads from the cocoon for use as silk is called reeling the silk. This is done with special machines.
(3) Throwing- In this process the raw silk is twisted to produce thrown silk.
(4) Dyeing- In the end silk is dyed for making colorful fabrics.
 
(ii) Draw a well labeled diagram and explain the life cycle of silk moth.
Answer- (1) The female silk moth lay eggs on the leaves of mulberry trees.
(2) The eggs hatch larvae in two weeks to form worm like structures which are called caterpillars or silkworms. They eat leaves and grows to become pupa.
(3) To protect itself pupa secretes fibre made of protein and rotates its mouth in the shape of 8. Hence a cocoon made of silk fibre is constructed around the moth.
7th.sci.eng.july.aug.new 2

Questions

            Very Short Answer

Q1)      Define sericulture?

Q2)      Which is the most common silk moth?

Q3)      What is reeling the silk?

Q4)      From where silk fibres come?

Q5)      What are occupational hazards?

           

            Short Answer

Q6)      What do you mean by the term silk route?

Q7)      What do you understand by the sorter’s disease?

Q8)      What is artificial silk made of?

Q9)      What do you mean by the natural silk?

Q10)    Why artificial silk is much cheaper than natural silk?

           

            Long Answer

Q11)    What are the steps of processing fibres into wool?

Q12)    State the difference between wool and silk?

Q13)    Explain the life history of silk moth?

Q14)    Explain the processing of cocoon to silk?

Q15)    State the difference between scouring and souring?

 

Please click on below link to download CBSE Class 7 Science Fibre to Fabric Worksheet Set A

Chapter 01 Nutrition in Plants
CBSE Class 7 Science Nutrition in Plants Worksheet Set A
CBSE Class 7 Science Nutrition in Plants Worksheet Set B
CBSE Class 7 Science Nutrition in plants Worksheet Set C
CBSE Class 7 Science Nutrition in plants Worksheet Set D
CBSE Class 7 Science Nutrition in Plants Worksheet Set E
Chapter 02 Nutrition in Animals
CBSE Class 7 Science Nutrition in Animals Worksheet Set A
CBSE Class 7 Science Nutrition in Animals Worksheet Set B
CBSE Class 7 Science Nutrition in Animals Worksheet Set C
CBSE Class 7 Science Nutrition in Animals Worksheet Set D
Chapter 03 Fibre to Fabric
CBSE Class 7 Science Fibre to fabric Set B
CBSE Class 7 Science Fibre to fabric Set C
CBSE Class 7 Science Fibre to Fabric Worksheet Set A
Chapter 04 Heat
CBSE Class 7 Science Heat Worksheet Set A
CBSE Class 7 Science Heat Worksheet Set B
CBSE Class 7 Science Heat Worksheet Set C
CBSE Class 7 Science Heat Worksheet Set D
Chapter 05 Acids, Bases and Salts
CBSE Class 7 Science Acid Bases and Salts Worksheet Set A
CBSE Class 7 Science Acid Bases And Salts Worksheet Set B
CBSE Class 7 Science Acid Bases And Salts Worksheet Set C
CBSE Class 7 Science Acid Bases And Salts Worksheet Set D
Chapter 06 Physical and Chemical Changes
CBSE Class 7 Science Physical And Chemical Change Worksheet Set B
CBSE Class 7 Science Physical And Chemical Change Worksheet Set C
CBSE Class 7 Science Physical and Chemical Changes Worksheet Set A
Chapter 07 Weather, Climate and Adaptations of Animals to Climate
CBSE Class 7 Science Weather Climate and Adaptions of Animals to Climate Worksheet Set A
Chapter 08 Winds Storms and Cyclones
CBSE Class 7 Science Winds Storms and Cyclones Worksheet Set A
CBSE Class 7 Science Winds Storms And Cyclones Worksheet Set B
Chapter 09 Soil
CBSE Class 7 Science Soil Worksheet Set A
Chapter 10 Respiration in Organisms
CBSE Class 7 Science Respiration in Organisms Worksheet Set A
Chapter 11 Transportation in Animals and Plants
CBSE Class 7 Science Transportation in Animals and Plants Worksheet Set A
CBSE Class 7 Science Transportation in Animals and Plants Worksheet Set B
CBSE Class 7 Science Transportation In Animals And Plants Worksheet Set C
CBSE Class 7 Science Transportation In Animals And Plants Worksheet Set D
Chapter 12 Reproduction in Plants
CBSE Class 7 Science Reproduction in Plants Worksheet Set A
CBSE Class 7 Science Reproduction in plants Worksheet Set B
CBSE Class 7 Science Reproduction in plants Worksheet Set C
Chapter 13 Motion and Time
CBSE Class 7 Science Motion and Time Worksheet Set A
CBSE Class 7 Science motion And Time Worksheet Set B
CBSE Class 7 Science motion And Time Worksheet Set C
Chapter 14 Electric Current and its Effects
CBSE Class 7 Science Electric Current and Its Effects Worksheet Set A
CBSE Class 7 Science Electric Current And Its Effects Worksheet Set B
CBSE Class 7 Science Electric Current And Its Effects Worksheet Set C
Chapter 15 Light
CBSE Class 7 Science Light Worksheet Set A
CBSE Class 7 Science Light Worksheet Set B
CBSE Class 7 Science Light Worksheet Set C
CBSE Class 7 Science Light Worksheet Set D
Chapter 16 Water: A Precious Resource
CBSE Class 7 Science Water A Precious Resource Worksheet
Chapter 17 Forests: Our Lifeline
CBSE Class 7 Science Forests Our Lifeline Worksheet Set A
Chapter 18 Wastewater Story
CBSE Class 7 Science Waste water Set B
CBSE Class 7 Science Wastewater Story Worksheet Set A
CBSE Class 7 Science Water Worksheet Set A
Revision Worksheets for Class 7 Science
CBSE Class 7 Science Revision Worksheet
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CBSE Class 7 Science Worksheet Set C
CBSE Class 7 Science Worksheet Set D
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CBSE Class 7 Science Worksheet Set G Solved
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Chapter 3 Fibre to Fabric CBSE Class 7 Science Worksheet

The above practice worksheet for Chapter 3 Fibre to Fabric has been designed as per the current syllabus for Class 7 Science released by CBSE. Students studying in Class 7 can easily download in Pdf format and practice the questions and answers given in the above practice worksheet for Class 7 Science on a daily basis. All the latest practice worksheets with solutions have been developed for Science by referring to the most important and regularly asked topics that the students should learn and practice to get better scores in their examinations. Studiestoday is the best portal for Printable Worksheets for Class 7 Science students to get all the latest study material free of cost. Teachers of studiestoday have referred to the NCERT book for Class 7 Science to develop the Science Class 7 worksheet. After solving the questions given in the practice sheet which have been developed as per the latest course books also refer to the NCERT solutions for Class 7 Science designed by our teachers. After solving these you should also refer to Class 7 Science MCQ Test for the same chapter. We have also provided a lot of other Worksheets for Class 7 Science which you can use to further make yourself better in Science.

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