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KPSKV Khalwa Nautan Siwan

Study Material › CBSE › Class 4 › Science › Notes

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The three basic needs of man are food, shelter and clothing.

Food –Those substances which we eat to get energy is called food.

Shelter – A place that provides food and protection for people or animals are called shelter.

Clothes – Those things which we worn to cover our body are called clothes.

 

How are clothes useful for us?       

Clothes are useful for us due to following reasons-

  • We wear clothes to cover our body.
  • Clothes protect us from heat, cold, dust and rain.
  • Clothes protect us from the heat of the sun.
  • We can protect ourselves from insect bites by clothes.
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    Fibre – A material or a substance that is made from natural or artificial threads are called fibre.

    Clothes are made up of fibres.

    Natural fibre – Those fibres which are obtained from plant and animals are called natural fibres. Ex– cotton, jute, linen, wool, silk and fur.

    Sources of fibre

  • Jute plant gives us jute fibre.
  • We get wool from the fur of sheep.  
  • The Silk thread is obtained from the cocoon of the silkworm.
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    What are the special features of natural fabrics?

  • Natural fabrics are comfortable because it absorbs sweat.
  • It allows circulation of air.
  • Natural fabrics made by silk and wool keep us warm.
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    Synthetic fibres – Those fibres that are made by man are called synthetic fibres.

    Ex- Nylon, rayon and polyester.

  • They are made artificially from chemicals and crude oil.
  •  

    What are the special features of synthetic fabrics?

  • Synthetic fabrics are strong and wrinkle free.
  • Some are stretchable and water proof.
  • Synthetic fabrics do not absorb sweat as they are waterproof and catch fire easily.
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    What are the different between natural and synthetic fibres?

    Natural fibres

    Synthetic fibres

    It is comfortable because it absorbs sweat.

    It is not comfortable because it not absorbs sweat.

    It allows circulation of air.

    It doesn’t allow circulation of air.

    It is not strong and wrinkle free.

    It is strong and wrinkle free.

    It is not stretchable and water proof.

    Some are stretchable and water proof.

    Ex– cotton, jute, linen, wool, silk and fur.

    Ex- Nylon, rayon and polyester.

     

    Variety of clothes – We wear different varieties of clothes according to the different seasons and climates.

    In summer season –

  • We wear cotton cloth as they absorb sweat and allowed the air to circulate and keeping a cool.
  • In summer we wear light on light colour cloth as they do not absorb heat.
  • Ex – Pant shirt, T shirt, vest etc.
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    In winter season –

  • We wear woollen clothes that keep us warm and protect us from the cold.
  • We wear dark coloured clothes as dark colours absorb heat and keep the body warm.
  • Ex – Sweater, Muffler, Gloves, jacket etc.
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    In rainy season –

  • We wear waterproof raincoat to protect us from rain and help us remain dry.
  • We also wear gumboots to keep feet our dry.
  • We carry an umbrella during the rainy season to keep ourselves from getting wet.
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    Clothes according to the profession:

    Uniform – The set of clothes worn at work by the member of certain organisations groups and usually by school children are called uniform.

  • Factory workers wear protective uniform that cover almost their entire body from neck to the feet.
  • Soldiers and police man wear uniform made of very tough material which does not tear easily.
  • Students wear school uniform so that they can easily be identified as a member of that particular institution.
  • A deep sea diver wears a waterproof suit.
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    Care for clothing

  • Clothes should be washed regularly with soap or detergent.
  • Washed clothes must be dried in the sun as sunlight kill germs.
  • Coloured clothes should be dried In the Shade to prevent them from fading.
  • Cotton clothes should be well ironed.
  • Woollen and silk clothes should be washed in mild detergent as they are very delicate.
  • Clothes of babies and patients must be rinsed in antiseptic solution to get rid of germs.
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    Storage of clothing

  • Clothes should be stored properly.
  • Woollen and Silk clothes should be stored properly with naphthalene balls or dry neem leaves.
  • They must be dry-cleaned before being packed.