8/6/2019 Science Modul F2 Chapter 1 the World Through Our Sense

http://slidepdf.com/reader/full/science-modul-f2-chapter-1-the-world-through-our-sense 1/9

CHAPTER 1: THE WORLD THROUGH OUR SENSES

1.1 Sensory Organ (pg 3, 4)

1. Senses help us to be ______________________________________________________________.

2. ___________ are changes in the surrounding.

3. We use sensory organ to ______________________.

4. Our five sensory organ are __________, __________, __________, ___________ and ______.

5. ___________________ are special structures that are sensitive to stimuli.

Sensory organ Sense of stimuliEye sight lightEar NoseTongueskin

6. The pathway from stimulus to response is:

Stimulus _____________________ ____________________ 

  _________________ ______________________ _______________ 

 ______________________ 

7. A stimulus will stimulate receptors in sensory organ to produce electrical messages known as

 _______ 

1.2 Sense of touch

The Skin (pg 5,6,7)

1. The skin is the sensory organ for ____________.

2. It is the ___________________ in the body.

3. The skin can detect changes in ________________, __________, ____________ and __________.

4. The five receptors found in the skin are:

Recectors in the skin Detect to /sensitive toTouch receptor Slight pressurePain receptor Heat receptor Cold receptor 

Heavy pressure

5. Label the receptors in the diagram below:

6 The sensitivity of the skin depends on

8/6/2019 Science Modul F2 Chapter 1 the World Through Our Sense

http://slidepdf.com/reader/full/science-modul-f2-chapter-1-the-world-through-our-sense 2/9

a) the thickness of the skin

b) the number of receptors

7. __________________, ______________ and _________________ are very sensitive to touch.

8.   ____________, ______, _____________________, and ______________________ are the least

sensitive to touch.

9. Blind people use Braille system to read.

1.3 Sense of smellNose (pg8)

1. Our nose is the sensory organ of __________________.

2. The __________________________________ has many sensory cells or ________________ to

detect smells.

3. The function of the mucus is to enable chemical substances to dissolve in it and stimulate the

sensory cells.

4. Label the part of the nose in the diagram below.

5. The smell pathway from the stimulus to the brain.Chemicals in the air smell sensory cell impulse brain

6. A person with influenza becomes less sensitive to smell because the mucus covers the sensory cell

and prevents it from being stimulated by chemical.

1.4 Sense of taste

Tongue (pg 9,10)

1. Tongue is the sensory organ for __________________.

2. Our tongue can detect four basic tastes: ______________, _______________, _____________ and

 ___________.

3. Our tongue is lined with ________________ which contain many __________________.

4. Label the part of tongue in the diagram below:

5. The taste pathway from the stimulus to the brain.

8/6/2019 Science Modul F2 Chapter 1 the World Through Our Sense

http://slidepdf.com/reader/full/science-modul-f2-chapter-1-the-world-through-our-sense 3/9

Chemicals in food taste buds/taste receptor impulse brain

Sense of taste and smell (pg 11)

1. Our sense of ____________ improves our sense of _________________.

2. As we chew, some chemicals from the food _______________________________and

 _______________________. But there are also some chemicals that ________________________ 

  _________________________.These chemicals ___________________________________________.

1.5 Sense of hearing

The ear 

1. The ear is the sensory organ of ____________________.

2. It has three main parts - ___________________, ______________________ and _____________.

Part Function1.Pinna Collects and directs sounds into the ear canal2.ear canal3. eardrum4. ossicles

5. ovalwindow

6. coclea

7.Eustachiantube8.auditorynerve9.semicircular 

canals

3. The sound pathway in the hearing mechanism.

Ear pinna auditory canal eardrum ossicles oval window coclea auditory nerve brain

8/6/2019 Science Modul F2 Chapter 1 the World Through Our Sense

http://slidepdf.com/reader/full/science-modul-f2-chapter-1-the-world-through-our-sense 4/9

1.6 sense of sight

The eyes ( pg 14, 17)

1. Our eyes are responsible for our sense of ______________.

2. The wall of the eyeball is made up of three layers: ___________, ___________ and

 _____________.

Part functionconjunctiva Protects the corneaAqueous humour Helps in refracting light, maintains the shape of the eye ballcorneaPupilirisYellow spot

Blind spotOptic nervescleraChoroid

retina

lensVitreous humour Suspensory ligamentsCiliary body

3. The path of light from the cornea in the eye to the brain.Cornea aqueous humour pupil lens vitreous humour retina optic nerve brain

1.7 Light and Sight

Reflection and refraction of light (pg 19)

1. Reflection of light occurs ____________________________________________________________ 

 ________________________________________________________________________________ 

2. The law of reflection:

8/6/2019 Science Modul F2 Chapter 1 the World Through Our Sense

http://slidepdf.com/reader/full/science-modul-f2-chapter-1-the-world-through-our-sense 5/9

a) the angle of incidence is the same as the angle of reflection.

b) The incident ray, the reflected ray, and the normal line are on the same plane.

 

3. Refraction is the bending of a light ___________________________________________________ 

_______________________________________________________________________________ 

a) When a light ray moves from a less dense medium (air) to a denser medium (glass), it is bends

towards the normal line.

b) When a light ray moves from a denser medium (air) to a less dense medium (glass), it is bends

aways from the normal line.

c) When a light ray is directed at right angles to a glass block, it will move straight through the glass

block.

 

Defects of vision and ways to correct them (pg 21-23)

1. The common defects of vision are ____________________, __________________,

 ______________, ___________________ and ___________________________.

Short-sightedness and long-sightedness

Short-sightedness (pg 22)

1. Can see near objects clearly but _____________________________________________________.

2. Light from a distant objects is focused _____________________of the retina.3. This is either because ___________________________ or _______________________________.

4. can be corrected using a ________________________________.

8/6/2019 Science Modul F2 Chapter 1 the World Through Our Sense

http://slidepdf.com/reader/full/science-modul-f2-chapter-1-the-world-through-our-sense 6/9

Long-sightedness (pg 23)

1. Can see distant objects clearly but ___________________________________________________.

2. Light from a near objects converges to a point_____________________of the retina.

3. This is either because ___________________________ or ________________________________.

4. Can be corrected using a ________________________________.

Astigmatism (pg 23)

1. Caused by _________________________________________________________.

2. Can be corrected using _______________________________________________.

Limitation of sight

Optical illusions (pg 24)

1. Optical illusion is a limitation in the sense of sight in which the brain does not interpret accurately

what is seen by the eyes.

8/6/2019 Science Modul F2 Chapter 1 the World Through Our Sense

http://slidepdf.com/reader/full/science-modul-f2-chapter-1-the-world-through-our-sense 7/9

The blind spot (pg 24)

1. When images fall on the __________________________________________________.

Stereoscopic and monocular vision (pg 25)

Stereoscopic vision

 

1. Have both eyes ___________ of the head.

2. The visual fields of both eyes ________________.

3. *This help the animals _____________________________________________________________.

4. Predators such as __________, __________ and _____________ 

Monocular vision

 

1. Have eyes __________________of the head.

2. The visual fields have ______________________________________.

3. This help them _________________________________________________________________ 

4. Preys such as ____________, _______________ and _______________________.

Devices used to overcome the limitations of sight ( pg 26)

Optical instruments Function

telescope To study stars in the skybinoculars Tomicroscope Toperiscope ToUltrasoundscanning

To

1.8 Sound and hearing (pg 29-30)

1. Sounds are produced by _________________.

2. Sounds needs _______________________________________.

3. Sounds can travel through ____________, ______________ and ___________________.4. Sound cannot travel through a __________________.

5. When sound hits a surface, it can be __________________ or _____________________.

8/6/2019 Science Modul F2 Chapter 1 the World Through Our Sense

http://slidepdf.com/reader/full/science-modul-f2-chapter-1-the-world-through-our-sense 8/9

6.   __________________________________like walls are __________________________________ 

7.   __________________________________like curtains are ________________________________ 

8. Reflected sound is called _______________.

9. There are two major types of hearing loss.

a. The first type involves the outer and middle ear,

i. it results from _______________________________________________________________ 

ii. can be treated ______________________________________________________________ 

 b. The second type involves damages to the inner ear.i. it caused by the _____________________________________________________________ 

 ___________________________________________________________________________ 

ii. cannot be treated medically but _________________________________________________.

Limitation of hearing (pg 30)

1. Detects sounds between _______________________________________.

2. Devices that can overcome the limitations of hearing are hearing aid, microphone, amplifier, load

speaker and stethoscopes.

Stereophonic hearing (pg 31)

1. Stereophonic hearing is hearing sounds from our surrounding with ___________________.

2. Stereophonic hearing enables us _____________________________________________________ 

1.9 Stimuli and responses in plants (pg 34-35)

1. The response of plants to stimuli is called tropism.

2. Plants are sensitive to three main kinds of stimuli : ____________, ___________ and __________.

3. a) Positive tropism-growth towards the stimulus.

b) negative tropism-growth aways the stimulus.

4. The four different types of tropism are:tropism stimulus1. hydrotropism water  2. geotropim gravity3. phototropism light4. thigmotropim touch

Hydrotropism- __________________________ (pg 34)

1. Roots tend to _____________________________________.They show ______________________ 

2.* ensures that plants ________________________________________________________________ 

 

Geotropism- _________________________ (pg 34)

1. The roots always grow ______________________________________, thus showing

 ____________ 

2.* This enables the roots to ____________________________________________________________ 

________________________________________________________________________________.3. The shoots grow _________________________________________, showing _________________ 

8/6/2019 Science Modul F2 Chapter 1 the World Through Our Sense

http://slidepdf.com/reader/full/science-modul-f2-chapter-1-the-world-through-our-sense 9/9

Phototropism- _________________________ (pg 35)

1. Shoots are positively phototropism, whereas roots are negatively phototropic.

2. *ensures that leaves _______________________________________________________________ 

Thigmotropism-___________________________(pg 35)

1. a response by plants _______________________________________________________________ 

2.* helps plants to get support and grow towards sunlight.

 

Nastic movements (pg 35)

1. Nastic movements are reponses to stimuli ______________________________________________