Fibre to Fabric NCERT CBSE Class 7 Science Chapter 3 Summary Note

Fibre to Fabric


*Fibre-  Very thin thread.
             - Thread is prepared from it.
             - Examples- Cotton, wool etc.,

*Fleece- Hair on body of animals is called
                  fleece.
              - It keeps body of animals warm.

* Role of fleece
                 - Fleece traps air in it.
                 - Air is poor conductor of heat.
                - Air doesn't allow heat to lose out.
          Hence, body of animals remain warm.

* Types of fibres-
      (a) Natural fibres- Cotton, Jute, Silk, Wool.
      (b) Synthetic or Artificial fibre- Rayon,
                                                   tericot, Nylon etc.,

* Types of natural fibres-
     (a) Plant fibre- Cotton, Jute
     (b) Animal fibre- Silk, Wool.

*Selective breeding- 
      Selection of parents to get special
     characters in offspring, is called
      selective breeding.

* Rearing-
       The practice of giving shelter, food and
      medical care to animal, is called rearing.

* Breeding-
       The process of giving birth to young ones,
       is called breeding.

* Processing fibre into wool 
           Following steps are done to process   
            fibre into wool-
    (a) Shearing-
         Removal of fleece from animal body.
    (b) Scouring-
         -Washing sheared fleece.
         - Dust and dirts are removed.
    (c) Sorting-
        Arranging fibre according to size and
        texture.
    (d) Separation of burrs-
        Removal of small fluffy fibres(burrs) .
    (e) Dying-
        Applying colours to fibres.
    (f) Spinning-
     Preparation of wool thread from wool fibre.

* Sericulture-
     -Rearing of silkworm
     - to get silk from silkworm,
        is called sericulture.

* Life cycle of Silkworm
   
     Silkmoth ----------> Eggs ------> 
     Larvae/Caterpillar/Silkworm ----> Pupa
     Pupa ----> Pupa in cocoon ---> Silkmoth

 * Caterpillar or Silkworm-
     - Larvae of silkmoth. 
     - Hatched out from eggs. 

 * Pupa - 
    - Fully grown caterpillar. 
    - it form a cover called cocoon. 

* The most common silkmoth is- 
                               Mulberry silkmoth. 

 * Reeling of Silk-
     -The process of taking out threads  
       from the cocoon for use as silk is 
      called reeling the silk. 

 * Silk fibres are spun into silk thread. 
   Silk threads are woven into silk cloth. 





                   

Comments

Post a Comment

Popular posts from this blog

Friction NCERT Science Class 8 Chapter 12 Summary Note

Friction The force that opposes the relative motion between two surfaces in contact, is called friction.  Factors affecting friction Weight of object  Nature of surfaces in contact More the weight of object, more the friction.  More smooth surface experience less friction.  Importance of friction Friction helps in stopping object Friction helps to write, walk,  Friction helps in all activities Friction produces heat.  Harm cause by Friction Sole of shoes wear out.  Machine parts get wear out.  Friction can be increased by making surfaces rough. ( More rough means more interlocking between surfaces which means more friction )  Friction can be decreased by applying lubricant on surfaces.  Friction can be decresed by changing shape of object.  Rolling friction The force that oppose motion of rolling object, is rolling friction.  Sliding friction The force that oppose moti...
Read more

Stars and the Solar System NCERT Science Class 8 Chapter 17 Summary Note

Stars and Solar System Celestial objects The stars, the planets, the moons and many other objects in the sky are called celestial objects.  Full Moon Day  The day on which the whole disc of the moon is visible is known as full moon day.  New Moon Day On the fifteenth day after full moon day, the moon is not visible. This day is known as new moon day.  Crescent Moon  The moon whose only a small portion appears in the sky, is called crescent moon.  Phases of Moon  The various shapes of the bright part of the moon as seen during a month are called phases of moon.  The moon doesn't produce its own light.  We see the moon because, the sunlight falling on it gets reflected towards us.  The moon rotates on its axis.  The moon revolve around the Earth.  The moon has no atmosphere, no water,  Star The sun is also a star.  Sun appears larger than other stars. Because- -Stars are millions of times farther away than the sun....
Read more

Fibre to Fabric NCERT CBSE CLASS 7 Science Online Test/Quiz

Fibre to Fabric  NCERT CBSE Class 7 Online Test/Quiz for Fibre to Fabric  Online test for "fibre to fabric" consists of ten questions, all having four alternatives. You have to choose the correct option. After attempting all questions, enter your name, class, roll no and email id. Email id is asked because through that results will be share to you.  And at last don't forget to submit your answers. After submission you can see your results too.  Enjoy taking test.  Topic- Fibre to Fabric NCERT CBSE Science Class 7 Loading…
Read more