Science Form 2:Chapter 1

CHAPTER 1: THE WORLD THROUGH OUR SENSES

SENSORY ORGANS & THEIR FUNCTIONS

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

SKIN Touch Touch, pressure, pain, cold heat

EARS Hearing and balance sounds

NOSE Smell Chemicals substances

Experiment 1.1: Sensory organs and their function EXPERIMENT

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Activity Observation ,[object Object],(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.

Activity Observation ,[object Object],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.

Activity Sensory organ Sense Stimulus (a) Eye Sight Light (b) (c) (d) (e)

5 Sense that detected by the 5 sensory organs are as follows: ,[object Object],[object Object],[object Object],[object Object],[object Object]

Science Form 2:Chapter 1

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