CHAPTER 1: THE WORLD THROUGH OUR SENSES

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1 CHAPTER 1: THE WORLD THROUGH OUR SENSES Human have. main sensory organs, which are... Sensory organs Type f sense Stimulus detected Skin Touch Smell Chemical substances Tongue Chemicals Ear Hearing Sight Pathway from stimulus to response. Stimulus sensory organ nerves nerves response Understanding key ideas. a. how many sensory organs do we have? What are they? b. Which of the following are stimuli that can be detected by human? i. Light :.. ii. Pain :.. iii. Smell :.. iv. Water :.. v. Chemical :.. vi. Gravity :.. c. Fill in the blanks. i. the.. are sensitive to light. ii. We use our. To taste food. iii. The is the largest organ in human body. iv. Roses produces stimulus in the form of.. v. The is the organ of smell. SENSE OF TOUCH Types of sense Sensory organ a. sight The eyes b. smell c. hearing d. taste e. touch a. the skin is divided into.. layers. Dermis (inner layer), (outer layer) and.. inner layer. b. The dermis contains.. receptor,.. receptor,. Receptor,.. receptor,.. receptor. c. Degree of sensitivity of the skin depend on: i.... ii. 1

2 SENSE OF SMELL The sensory receptors are sensitive to chemicals in the air. They are located in the nasal cavity and covered with The sensitivity of the nose towards stimuli is influenced by: i. ii. SENSE OF TASTE The tongue is the sensory organ for. The surface of the tongue has groups of cells known as.. which are sensitive to taste. 3. There are four types of taste buds on the tongue sensitive to.. and.. SENSE OF HEARING Label diagram below. Part OUTER EAR Pinna ear canal / auditory canal Eardrum MIDDLE EAR Ossicles Eustachian tube oval window INNER EAR Cochlea semicircular canals auditory nerves FUNCTIONS OF DIFFERENT PARTS OF THE HUMAN EAR function 2

3 The.. and.. are not involved in the hearing mechanism. To overcome the limitations of hearing, we use i. the.. enables doctor to detect the soft heartbeats of patients. ii.. collects sound signals before being sent to the middle ear. iii. boosts weak sound signals. SENSE OF SIGHT part structure/characteristic Function Sclera Cornea Choroids Conjunctiva Iris Pupil Lens cilliary muscle suspensory ligament vitreous humour aqueous humour Retina optic nerve Identify the sensory organs which detect the following stimuli. No stimulus Detected by (sensory organ) 1 colour The eyes 2 Perfume 3 Pain 4 Cold 5 Light 6 Body movement 7 Musical sound 8 A sour young mango fruit 9 Bitter-tasting medicine tablet 3

4 Reflection of light When light passes through a convex lens, an image that is.,.. and.. will be formed at the back of the eye lens. Plain mirror Normal line 35 0 Incident ray Refraction of light. a. Draw the correct light path that travels in different mediums. water air air water air water Examples appliances: principle of reflection a. b. Try to answer: 4

5 Defects of vision and corrections SHORT-SIGHTEDNESS DEFFERENCES LONG-SIGHTEDNESS Symptoms of defect Causes of effect Position of image of object (draw figure) By wearing.. Figure: By wearing.. Figure: Corrective measure (draw figure) Note: a. short-sightedness can be corrected by wearing spectacles b. Long-sightedness can be corrected by wearing spectacles c. Astigmatism can be corrected by wearing spectacles. Optical illusion Definition:. 5

6 Blind spot Definition: Limitations of sight and corrective devices Bil Instrument Function 1 Microscope 2 Telescope 3 Binocular 4 Magnifying Monocular and stereoscopic vision. a. monocular vision is vision using only eye. b. Stereoscopic vision is vision using. eyes. MONOCULAR VISION SIMILARITY Involves sensory organ of sight, that is eye. DIFFERENCES POSITION OF EYE STEREOCOPIC VISION AREA OF VISION FIELD 3. IMPORTANCE 4. EXAMPLES OF ANIMALS Ability to estimate distance and position accurately. 5. FIGURE STEREOPHONIC HEARING a. Stereophonic hearing is hearing using. Ears. b. the advantages of stereophonic hearing are: i. ii. iii.. iv.. 6

7 Devices to overcome hearing limitations Bil Instrument Function 1 Stethoscope 2 Amplifier 3 Earphone 4 STIMULI AND RESPONSES IN PLANT TROPISM a. Phototropism is the response of plants towards b. Geotropism is the response of plants towards c. Hydrotropism is the response of plants towards d. Thigmotropism is the response of plants towards e. Nastic movement is the responses of plant. f. Shoot of plant show: a. phototropism b. Negative.. g. Root of plant show: a. hydrotropism b. geotropism h. tendrils of plant show: a. thigmotropism b. Negative.. hydrotropism Type of tropism Phototropism - sensitive to Hydrotropism - sensitive to 3. Geotropism - sensitive to 4. Thigmotropism - sensitive to 5. Nastic Movement - sensitive to The end.. 7

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