Friday 17 February 2012

SUMBER-SUMBER UTAMA ~FORM 3 GEOGRAFI

               JENIS - JENIS SUMBER

Sumber Yang Boleh Diperbaharui
- sumber yang boleh digunakan secara berterusan
Contoh
          - Hutan
          - Suria
          - Tanih
          - Air

Sumber Yang Tidak Boleh Diperbaharui
-sumber yang akan habis apabila digunakan secara berterusan
Contoh 
          -petroleum
          -gas asli
          -batu granit
          -pasir dan kaolin

SUMBER-SUMBER UTAMA

  • SUMBER MINERAL 
  • bahan bakar(petroleum,arang batu,gas)
  • bahan asas industri(bauksit, timah)
  • bahan mentah(kaolin,silika)
  • perhiasan(emas,berlian)
  • SUMBER TENAGA SURIA
  • membekalkan haba dan tenaga
  • SUMBER TANIH
  • bahan mentah untuk barangan pengguna dan membuat bangunan
  • kawasan pertanian
  • SUMBER HUTAN
  • habitat hidupan liar
  • SUMBER AIR
  • sumber protein
  • kegunaan domestik
  • membekalkan tenaga hidroelektrik

Wednesday 15 February 2012

DISEASES RELATED TO THE RESPIRATORY SYSTEM

ASTHMA ~ narrowing of the bronchi and bronchioles, and this causes difficulty in breathing.
LUNG CANCER ~heavy smokers have higher risk of getting lung cancer.
EMPHYSEMA ~alveoli are broken down.this reduces the surface are for gaseous change and causes difficulty in breathing.
BRONCHITIS ~persistent coughcaused by infection by bacteria or viruses and cigarettes smoke.

IMPROVING THE AIR QUALITY.



  • campaign to avoid smoking or quit smoking
  • ban smoking in public areas
  • avoid open burning
  • encourage the use of public transport
  • implementation of law and regulation to control air pollution.

RESPIRATION ~form 3~

  # RESPIRATION  = living process in which energy is released from the food we eat.

THE STRUcTURE OF THE HUMAN RESPIRATORY SYSTEM.

@ nostrils.~the walls of the nostrils are lined with hairs to trap dust particles in the air. 
@nasal cavity. ~the interior are of the nose.
@bronchi. ~2 main air passages into the lungs .each bronchus branches into smaller tubes called bronchioles

THE PASSAGE OF AIR
nostrils -> nasal cavity -> trachea -> bronchus -> bronchiole -> alveolus

INHALATION = breath in air
EXHALATION = breath out air





INHALATION 
  • intercostal muscles contracts
  • rib cage moves outwards
  • diaphragm contracts and flatten
  • volume of thoracic cavity increases
  • air pressure in thoracic cavity decrease
EXHALATION
  • intercostal muscles relaxes
  • rib cage moves inwards
  • diaphragm relaxes and curves upwards
  • volume of thoracic cavity decreases
  • air  pressure in thoracic cavity increase

.

Friday 10 February 2012

FRICTION - form 2

 ~ friction = force that opposes motion.
 ~occurs whenever 2 surfaces rub against each other.
 ~ has direction and magnitude.

 ~ friction can :
 (a) prevent a statinary object from moving.
 (b) slow down or stop moving object.

 ~the magnitude of the frictional force depends on :
 (a) the nature of the surface.
*the rougher the surfaces, the greater the frictional force between them.
 (b) the weight of the object.
*the heavier the object,the greater the frictional force acting on it.

StIMuLus And reSPONse iN PLAntS - form 2

 ~ the response by plants to stimuli is called TROPISM.
 ~there are 2 types : (a) POSITIVE tropism - response by plants ToWaRdS the stimulus.
                               (b) NEGATIVE tropism - response by plants AwAy from the stimulus.


        1. PHOTOtropism - light
        2. GEOtropism - gravity
        3. HYDROtropism - water
        4. THIGMOtropism - touch

     

 have TENDRILS...







       






                5.NASTIC MOVEMENT - touch
   ~e.g. mimosa plant