Science Form 2:Chapter 1

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Presentation on the topic sensory organs and their function

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Science Form 2:Chapter 1

  1. 1. SAY THE NUMBERS YOU CAN SEE!
  2. 4. CHAPTER 1: THE WORLD THROUGH OUR SENSES
  3. 5. SENSORY ORGANS & THEIR FUNCTIONS
  4. 6. Relationship between stimuli and senses to sensory organs Sensory organ Types of sense Stimulus detected Skin Touch Touch, pressure, pain, cold and heat Nose Smell Chemical substances Tongue Taste Chemicals Ear Hearing and balance Sound Eye Sight Light
  5. 7. SKIN Touch Touch, pressure, pain, cold heat
  6. 8. EARS Hearing and balance sounds
  7. 9. TONGUE Taste chemicals
  8. 10. NOSE Smell Chemicals substances
  9. 11. EYES Sight Light
  10. 12. Experiment 1.1: Sensory organs and their function EXPERIMENT
  11. 13. <ul><li>Objective : </li></ul><ul><li>To show the relation between the five sensory organs and their stimuli. </li></ul><ul><li>Materials: </li></ul><ul><li>Icing sugar, fine salt, vanilla essence, oats, acid chloride </li></ul><ul><li>Apparatus: </li></ul><ul><li>Test tubes, evaporating dishes, litmus paper, beaker, dropper </li></ul><ul><li>Procedures: </li></ul><ul><li>The activities given in the table below are carried out and observations are recorded. </li></ul><ul><li>Table 1.1 to be completed to show the relation between the sensory organs and their stimuli. </li></ul>
  12. 14. Activity Observation <ul><li>A few drops of chloride acids are added to litmus paper. </li></ul>(b) Three beaker of the same size are filled with different volumes of water. Then the edge of each beaker is tapped with glass rod (c) 10cm 3 of water and a few drops of vanilla essence in 10cm 3 of water are placed in separate test tubes and sniffed (d) Dry oats and wet oats placed in separate evaporating dishes are touched with the fingers and compared. (e) Fine salt and icing sugar, placed on separate evaporating dishes, are tasted and compared.
  13. 15. DISCUSSION
  14. 16. Activity Observation <ul><li>A few drops of chloride acids are added to litmus paper. </li></ul>Litmus paper changes to red. (b) Three beaker of the same size are filled with different volumes of water. Then the edge of each beaker is tapped with glass rod Sounds are heard. (c) 10cm 3 of water and a few drops of vanilla essence in 10cm 3 of water are placed in separate test tubes and sniffed Vanilla essence gives a fragrant smell. Water does not have any smell. (d) Dry oats and wet oats placed in separate evaporating dishes are touched with the fingers and compared. Wet oat re starchy. Dry oat are powdery. (e) Fine salt and icing sugar, placed on separate evaporating dishes, are tasted and compared. Salt tastes salty. Sugar taste sweet.
  15. 17. Activity Sensory organ Sense Stimulus (a) Eye Sight Light (b) (c) (d) (e)
  16. 18. CONCLUSION
  17. 19. 5 Sense that detected by the 5 sensory organs are as follows: <ul><li>Skin – touch, heat, cold, and pressure </li></ul><ul><li>Nose – smell </li></ul><ul><li>Tongue – taste </li></ul><ul><li>Ears – sounds </li></ul><ul><li>Eyes - light </li></ul>

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