Telangana SCERT Class 7 Science Chapter 3 Solution – Animal Fibre. Here in this post we provides Class 7 Science Animal Fibre Telangana State Board Solution. Telangana State Board English Class VII Medium Students can download this Solution to Solve out Improve Your Learning Questions and Answers.
Telanagana State Board Class 7 Science Chapter 3 Animal Fibre Solution:
(1) In sericulture industry do which stages of silk worm do weavers buy? Why do they do so?
Ans: – Egg, Larva, Pupa, Adult moth are the stages in the life cycle of silk worm.
Normally the silk traders prefer to buy the silkworms in cocoon stage. They put these cocoons in boiling water and extract the long silk threads.
In sericulture industry, weavers buy silk yarn from reeling center.
Weavers are trained to weave fabric from silk yarn.
Then silk yarn they buy is ready to be woven into a variety of fabrics.
So the weavers buy silk yarn in order to made different, beautiful and luxuries cloths.
(2) Which place in our state is called silk city?
Ans: – Pochampally is the silk city in our state Telangana.
(3) Prepare a chart showing life cycle of silkworm and display that in the class room.
Ans: –
(4) Why are cocoons stifled?
Ans: – Kill the travel inside by a process is called stifling. The cocoons have to be stifled to kill the larva.
It cocoon isn’t stifled the larvae inside them won’t die and later into a moth and fly away. Therefore we can’t get thread of silk from such a quality fibre for fabric.
Stiffing also helps to store the cocoons for a long time.
Inside by a process called stifling. Boiling cocoons to get silk fibre, this process is called reeling.
Now the silk fibres are spun into silk thread and finally it is used for rearing clothes and it can be dyed into different colors.
Weaving silk fabric by using silk yarn on hand looms.
(5) What will happen if cocoon is not boiled?
Ans: – Cocoons are boiling to get silk fibre from it. The cocoons have to be boiled to loosen the fibre to be able to reel it.
If cocoons are not boiled then the fine thread of silk will not be obtained and also the cocoons will be brittle in nature.
(6) What are the differences between fleece of Angora goat and camel?
Ans: – (i) Camel lives in Rajasthan. But Angora goat is lived in Kashmir.
(ii) Camels have rough and coarse hair. But in the case of Angora goat have soft hair.
(7) Make a flow chart showing various stages of production of woollen fabric.
Ans: -A flow chart to show the processes of production the woollen fabric –
Shearing -> Scouring -> Sorting -> Bleaching -> Dyeing -> Combing / Carding -> Rolling and Twisting -> Spinning -> Weaving or knitting -> woollen fabric.
(8) In what way is knitting different from weaving?
Ans: – Knitting is the process of making fabric by using knitting needles to from interlocking loops and rings of woollen yarn.
But weaving is the production from two types of threads, one set of yarn is used in weaving.
(10) Fill up the blank and give your reasons for the statement.
Ans: – Woollen Fabric protect us from cold.
(11) If you are going to visit Dal lake at Kashmir which type of clothes would you like to keep in your luggage? Why?
Ans: – I would prefer to keep the woollen clothes like sweaters, jackets, trousers, etc. Or dark colour woollen clothes while visiting to Dal Lake in Kashmir.
Kashmir is a cool place and most of the time it is very cold there. The temperature in Kashmir may have 15 to 24 celsius. So if we are going to visit Kashmir may feel cold as the weather is too cold and keeps on changing. Hence we keep the warm clothes, to enjoy our trip rather than we are shivering due to this cold.
(12) Do you find any similarities between silk and wool weaving? What are they?
Ans: – Yes both silk and wool are similar and both obtained from animals. Silk is obtained from silkworms and wool from sheep etc. Both of they are very soft and smooth fibres. So can be spun easily weaving of both silk and wool can be done on hand loom or power loom or by several manual methods also.
(13) Write 5 differences between wool and silk manufacturing.
Ans: – wool is produced from fleece or fur of animals like sheep Angora goat etc.
Silk is obtained from cocoons of silk worms.
Wool is specially used for winter clothes like sweaters, jackets, trousers, mufflers etc.
Silk is used in natural weather and for formal dresses, like silk dhotis and silk saree.
Wool does not have any shiny texture. But silk has a shiny, shimmery texture.
Wool is a poor conductor of heal. So we feel not and are protected from cold.
Silk is more sensitive to heat.
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Wool manufacturing
At first fleece or fun of sheep is removed from its body by a process called sharing.
Secondly sheared skin or fun may be washed to remove grease, dirt and dust. This process called scouring.
Then wool is separated based on the overall quality by a process called grading and also it is separated based on which body part of it can from, by a process called sorting.
Next the wool is dyed into many different colors. Now, coloured fibres are used to make yarn and then combed.
Next process is called spinning. Then finally the woollen fabrics are knitted or wover.
Silk manufacturing
The eggs of silkworm moth are placed in trays and feeding them at first.
Then they hatch into a larva. These larvas are feed on mulberry leaves for about six weeks.
The larva of silk worm under goes changes in the cocoon into a month. The cocoons are boiled to kill the insects inside them. Kill the larvae inside by a process called stiffline. Boiling cocoons to get silk fibre, this process is called reeling.
Now the silk fibres are spun into silk thread and finally it is used for weaving clothes and it can be dyed into different colors.
Weaving silk fabric by using silk yarn on hand looms.
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