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Science unit three

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  • Give reasons : The main source to prepare nitrogen is the air ?
    Because nitrogen form 78% of the volume of atmosphere .
  • Who is the best miss in the science
    Miss asma
  • Define nervous system :
    It is a communication and controlling body system
  • Give reasons : Cerebellum has a great importance during the movement of the body .
    Because it maintains the balance of the body during its movement .
  • Define spinal cord ?
    It is a cylindrical cord from which the spinal nerves extend .
  • Give reasons for : Oxy-acetylene flame is used for cutting and welding metals .
    Because the temperature of oxy-acetylene flame reaches 3500 c which is sufficient to cut or weld metals
  • Define slightly movable joints ?
    They are joints that allow movement in one direction only .
  • Important of use Limewater :
    It is used to detect the presence of carbon dioxide gas .
  • Define ozone ?
    A gas that its molecule is composed of three oxygen atoms .
  • Define the atmosphere
    It is a mixture of different gasses surrounding the earth .
  • What happens when : Getting rid of soil bacteria ?
    Legumes as clover , peas and soybeans cant make protein .
  • Define catalyst ?
    A chemical substances that remains without any change in its quantity and structure during the chemical reaction
  • Define skull :
    It is a bony box contains cavities for eyes ,ears and nose
  • What happens when : There is no the atmosphere .
    The ultraviolet radiations will reach the earth from the outer space , so the temperature of the earth will be variable
  • what happens when : The cerebellum is shocked hardly .
    The body will lose its balance .
  • Importance of use : Dendrites :
    They are connected to the neighbouring neurons to form synapse
  • Give reasons : Brain is the main control center in the human body
    Because it directs and coordinates all the processes , ideas , behaviors and emotions
  • Give reasons for : clear limewater is used to detect the presence of carbon dioxide gas .
    Because clear limewater turns into milky when carbon dioxide gas passes through it
  • What happens when ...? There is no oxygen in the atmosphere .
    Living organisms cannot respire , so they will die
  • What happens when : The absence dendrites and axon terminals .
    The synapse are not formed
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