CBSE Class 7 Science Fibre to Fabric Worksheet Set A

Download printable Science Class 7 Worksheets in pdf format, CBSE Class 7 Science Fibre to Fabric Worksheet Set A 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 Grade 7. Free chapter wise worksheets with answers have been designed by Standard 7 teachers as per latest examination pattern

Fibre to Fabric Class 7 Science Worksheet Pdf

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

Class 7 Science Worksheet for Fibre to Fabric

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

Tags: 

 


Click to View or Download pdf file
Click for more Science Study Material
CBSE Class 7 Science Electric Current And Its Effects Worksheet Set C
CBSE Class 7 Science Revision Worksheet
CBSE Class 7 Science Worksheet Set F
CBSE Class 7 Science Motion and Time Worksheet Set A
CBSE Class 7 Science Nutrition in plants Worksheet Set D
CBSE Class 7 Science Weather Climate and Adaptions of Animals to Climate Worksheet Set A
CBSE Class 7 Science Electric Current and Its Effects Worksheet Set A
CBSE Class 7 Science Light Worksheet Set D
CBSE Class 7 Science Respiration in Organisms Worksheet Set A
CBSE Class 7 Science Waste water Set B
CBSE Class 7 Science Fibre to fabric Set B
CBSE Class 7 Science Nutrition in Plants Worksheet Set A
CBSE Class 7 Science Worksheet Set G Solved
CBSE Class 7 Science Nutrition in Animals Worksheet Set A
CBSE Class 7 Science Physical And Chemical Change Worksheet Set B
CBSE Class 7 Science Winds Storms and Cyclones Worksheet Set A
CBSE Class 7 Science Fibre to Fabric Worksheet Set A
CBSE Class 7 Science motion And Time Worksheet Set B
CBSE Class 7 Science Soil Worksheet Set A
CBSE Class 7 Science Water A Precious Resource Worksheet
CBSE Class 7 Science Worksheet Set A
CBSE Class 7 Science Fibre to fabric Set C
CBSE Class 7 Science Worksheet Set H Solved
CBSE Class 7 Science Nutrition in Animals Worksheet Set B
CBSE Class 7 Science Physical And Chemical Change Worksheet Set C
CBSE Class 7 Science Acid Bases And Salts Worksheet Set B
CBSE Class 7 Science Forests Our Lifeline Worksheet Set A
CBSE Class 7 Science motion And Time Worksheet Set C
CBSE Class 7 Science Transportation in Animals and Plants Worksheet Set A
CBSE Class 7 Science Winds Storms And Cyclones Worksheet Set B
CBSE Class 7 Science Worksheet Set B
CBSE Class 7 Science Heat Worksheet Set B
CBSE Class 7 Science Worksheet Set I Solved
CBSE Class 7 Science Nutrition in Plants Worksheet Set A
CBSE Class 7 Science Reproduction in plants Worksheet Set B
CBSE Class 7 Science Acid Bases And Salts Worksheet Set C
CBSE Class 7 Science Heat Worksheet Set A
CBSE Class 7 Science Nutrition in Animals Worksheet Set C
CBSE Class 7 Science Transportation in Animals and Plants Worksheet Set B
CBSE Class 7 Science Worksheet Set C
CBSE Class 7 Science Heat Worksheet Set C
CBSE Class 7 Science Worksheet Set J
CBSE Class 7 Science Nutrition in Plants Worksheet Set B
CBSE Class 7 Science Reproduction in plants Worksheet Set C
CBSE Class 7 Science Acid Bases And Salts Worksheet Set D
CBSE Class 7 Science Light Worksheet Set A
CBSE Class 7 Science Nutrition in Animals Worksheet Set D
CBSE Class 7 Science Wastewater Story Worksheet Set A
CBSE Class 7 Science Worksheet Set D
CBSE Class 7 Science Heat Worksheet Set D
CBSE Class 7 Science Worksheet Set K
CBSE Class 7 Science Physical and Chemical Changes Worksheet Set A
CBSE Class 7 Science Transportation In Animals And Plants Worksheet Set C
CBSE Class 7 Science Electric Current And Its Effects Worksheet Set B
CBSE Class 7 Science Worksheet Set E Solved
CBSE Class 7 Science Light Worksheet Set B
CBSE Class 7 Science Nutrition in plants Worksheet Set C
CBSE Class 7 Science Water Worksheet Set A
CBSE Class 7 Science Acid Bases and Salts Worksheet Set A
CBSE Class 7 Science Light Worksheet Set C
CBSE Class 7 Science Worksheet Set M
CBSE Class 7 Science Reproduction in Plants Worksheet Set A
CBSE Class 7 Science Transportation In Animals And Plants Worksheet Set D

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Score well in Class 12 English Boards Exam

12th Board exams are an important part of students' lives. The marks obtained in the board exam decide the college in which one can study. In class 12 the syllabus of each and every subject increases vastly and it is difficult to cover up every point. In English also...

How To Solve Unseen Passages In English

Unseen passages may contain one or many paragraphs. This is one of the important yet easy parts for a student to get marks. Students should thoroughly study and understand the passage to answer the related questions. The unseen passages are there just to test the...

CBSE Class 10 Revised Syllabus

Last year CBSE had to reduce the syllabus because of the pandemic situation but it was not very effective because there were no examinations. This year to avoid any confusion and conflict, CBSE has decided to reduce the syllabus into term 1 and term 2. 50 percent of...

MCQ Question based CBSE examination

For 2021-22 CBSE has launched MCQ question-based examination for Term 1 & Term 2 board examinations. The entire syllabus has been divided into two parts each including 50% of the entire syllabus. To score well, students must practice as per the new CBSE term-wise...

×
Studies Today